CN213661448U - Short-circuit protection circuit for LLC resonant power supply - Google Patents
Short-circuit protection circuit for LLC resonant power supply Download PDFInfo
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- CN213661448U CN213661448U CN202022619614.1U CN202022619614U CN213661448U CN 213661448 U CN213661448 U CN 213661448U CN 202022619614 U CN202022619614 U CN 202022619614U CN 213661448 U CN213661448 U CN 213661448U
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- 230000005669 field effect Effects 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 34
- 238000010586 diagram Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 4
- 208000031361 Hiccup Diseases 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- 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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a short-circuit protection circuit for LLC resonant power source, including high pressure self-starting module, high pressure self-closing module and short-circuit protection module, the short-circuit protection module includes time cycle subassembly and discharge protection subassembly, the discharge protection subassembly is connected with working power supply, the time cycle subassembly includes electric capacity C6 and resistance R25, the discharge protection subassembly includes resistance R81 and the electrochemical capacitance EC2 that is used for filtering, field effect transistor Q6 ' S the S utmost point, working power supply ' S positive pole, electrochemical capacitance EC2 ' S one end and resistance R81 ' S one end all are connected with LLC drive chip U1 ' S power end VCC, high speed switch diode Q5 ' S third terminal is connected with LLC drive chip U1 ' S low level output L, high speed switch diode Q5 ' S second end, electric capacity C6 and resistance R25 all are connected with triode Q4 ' S base. The utility model discloses in, adopt electrochemical capacitance EC2 to filter for when short-circuit protection module moved, can discharge electrochemical capacitance EC2 rapidly, and then the trigger time cycle subassembly.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a short-circuit protection circuit for LLC resonant power source.
Background
The high-voltage self-starting, self-closing and short-circuit protection functions of the LLC resonant power supply are important components in an LLC resonant power supply system, and the function of the LLC resonant power supply is to protect power elements in the switching power supply and other circuits of the system from working in a safe area during debugging or using of the switching power supply. At present, overcurrent protection modes are mainly divided into a self-locking type and a hiccup type protection mode. The self-locking protection mode is that when overcurrent or short circuit faults occur, the protection circuit is started, the power supply stops working, and at the moment, the power supply needs to be powered off, fault troubleshooting and repairing are performed, and then the power supply is started. However, in many switching power supply loads, the power supply is required to operate in a short-circuit fault state within a short time without interruption, and meanwhile, a power switch tube is prevented from being damaged due to heat accumulation caused by continuous short-circuit, so that some manufacturers intend to restart the LLC resonant power supply within a short time by adding a power-down time constant circuit, but the power-down time constant circuit is limited by the discharge speed of a conventional electrical element, and cannot break through the problem.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a short-circuit protection circuit for LLC resonant power supply, its LLC resonant power supply that can solve short-circuit fault can't restart in the short time problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a short-circuit protection circuit for LLC resonant power source, includes high pressure from start-up module, high pressure from close the module and be used for carrying out short-circuit protection' S short-circuit protection module to LLC driver chip U1, high pressure is from start-up module including field effect transistor Q6, high pressure is from close the module and is included triode Q4 and high-speed switch diode Q5, short-circuit protection module includes time cycle subassembly and discharge protection subassembly, discharge protection subassembly is connected with working power supply, the time cycle subassembly includes electric capacity C6 and resistance R25, discharge protection subassembly includes resistance R81 and the electrochemical capacitance EC2 that is used for filtering, the D utmost point of field effect transistor Q6 is connected with high voltage power supply, the G utmost point of field effect transistor Q6 and the collecting electrode of triode Q4 all are connected with high voltage power supply, the S utmost point of field effect transistor Q6, the positive pole of working power supply, the one end of electrochemical capacitance EC2 and the one end of resistance R81 all are connected with the VCC of LLC driver chip U1, the third end of the high-speed switching diode Q5 is connected with the low-level output end L of the LLC driving chip U1, the second end of the high-speed switching diode Q5, one end of the capacitor C6 and one end of the resistor R25 are all connected with the base electrode of the triode Q4, and the first end of the high-speed switching diode Q5, the emitter of the triode Q4, the negative electrode of the working power supply, the other end of the electrochemical capacitor EC2 and the other end of the resistor R81 are all grounded.
Preferably, the high-voltage self-starting module further includes a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R7, a resistor R8, a resistor R9, a resistor R10, and a zener diode ZD1, one end of the resistor R11 and one end of the resistor R17 are both connected to the high-voltage power supply, the other end of the resistor R11 is connected to one end of the resistor R14 through a resistor R12 and a resistor R13 in sequence, a collector of the triode Q4, a G pole of the fet Q6, and a cathode of the zener diode ZD1 are all connected to the other end of the resistor R14, the other end of the resistor R7 is connected to one end of the resistor R10 through a resistor R8 and a resistor R9 in sequence, the other end of the resistor R10 is connected to a D pole of the fet Q6, and an anode of the zener diode ZD1 is grounded.
Preferably, the high-voltage self-shutdown module further includes a resistor R26 and a capacitor C7, a third end of the high-speed switching diode Q5 is connected to a low-level output end L of the LLC driver chip U1 through the capacitor C7, a second end of the high-speed switching diode Q5 is connected to one end of a resistor R26, and the other end of the resistor R26, one end of the capacitor C6, and one end of the resistor R25 are all connected to a base of the triode Q4.
Compared with the prior art, the beneficial effects of the utility model reside in that: the resistor R81 can completely discharge the electrochemical capacitor EC2 in a very short time, and meanwhile, a time period component consisting of the capacitor C6 and the resistor R25 controls the closing and conducting time of the triode Q4, so that the LLC driving chip U1 can be restarted normally in a short time after a period, and a safe short-circuit protection and hiccup mode is formed.
Drawings
Fig. 1 is a circuit diagram of the protection circuit for high-voltage self-starting of the LLC resonant power supply in this embodiment.
Fig. 2 is a circuit diagram of the high voltage self-starting module in this embodiment.
Fig. 3 is a circuit diagram of the high voltage self-shutdown module in this embodiment.
Fig. 4 is a circuit diagram of the self-powered module in the embodiment.
Fig. 5 is a circuit diagram of the short-circuit protection module in the present embodiment.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention will be further described with reference to the accompanying drawings and specific embodiments:
in the utility model discloses in, the model of high-speed switch diode Q5 can be NXP-BAV99, as shown in FIG. 3, the first end of high-speed switch diode Q5 is connected with diode 1's in high-speed switch diode Q5 anodal, the second end is connected with diode 2's in high-speed switch diode Q5 negative pole, the third end is connected with diode 1's in high-speed switch diode Q5 negative pole and diode 2's anodal, LLC drive chip U1's model can be IR 11682.
As shown in fig. 1-5, a protection circuit for high-voltage self-starting of an LLC resonant power supply includes a high-voltage self-starting module for providing a high-voltage starting signal to an LLC driver chip U1, a high-voltage self-closing module for closing the high-voltage self-starting module, a self-power module for providing a working voltage to an LLC driver chip U1, and a short-circuit protection module for providing short-circuit protection to an LLC driver chip U1, where an output end of the high-voltage self-starting module and an output end of the self-power module are both connected to a power supply terminal VCC of the LLC driver chip U1, an input end of the self-power module is connected to a transformer auxiliary winding, an input end of the high-voltage self-starting module is connected to a high-voltage power supply, the short-circuit protection module includes a time period component for restarting the LLC driver chip U1 according to a preset period, and the high, the high-voltage self-closing module and the self-power supply module are both connected with the high-voltage self-starting module. In this embodiment, the high-voltage self-starting module supplies a high-voltage starting voltage to the LLC resonant power supply during the starting process, and when the LLC resonant power supply works normally, the high-voltage self-closing module automatically closes the high-voltage starting, so that the self-power supply module continuously supplies the LLC resonant power supply to work normally; when the short circuit, short-circuit protection module can detect short-circuit fault, through the time cycle subassembly that sets up in advance, can draw down LLC driver chip U1's power end VCC's voltage in the regulation time cycle to can the automatic recovery normal, thereby will play the short-circuit protection effect to LLC resonant power source, can also resume normal work by oneself after short-circuit fault eliminates in addition, be equivalent to a novel technique can play multiple protection and function.
Specifically, the high-voltage self-starting module comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a field effect transistor Q6 and a voltage stabilizing diode ZD1, wherein one end of the resistor R11 and one end of the resistor R17 are both connected with a high-voltage power supply, the other end of the resistor R11 is connected with one end of the resistor R14 through a resistor R12 and a resistor R13 in sequence, a G pole of the field effect transistor Q14 and a cathode of the voltage stabilizing diode ZD 14 are both connected with the other end of the resistor R14, the other end of the resistor R14 is connected with one end of the resistor R14 through the resistor R14 and the resistor R14 in sequence, the other end of the resistor R14 is connected with a D pole of the field effect transistor Q14, an anode of the voltage stabilizing diode ZD 14 is grounded, and an S pole of the field effect transistor Q14 is connected with. In this embodiment, the resistor R7, the resistor R8, the resistor R9 and the resistor R10 are connected in series to limit the current flowing through the power supply terminal VCC of the LLC driving chip U1, so that the current flowing through the power supply terminal VCC of the LLC driving chip U1 satisfies the internal operating current of the LLC driving chip U1, and at the same time, the resistor R11, the resistor R12, the resistor R13 and the resistor R14 limit the current flowing through the field-effect transistor Q6 and the zener diode ZD 1. When the high voltage is started, the G pole of the field effect transistor Q6 obtains a voltage large enough to conduct the D pole and the S pole, so that a starting voltage is applied to the power supply terminal VCC of the LLC driver chip U1, and the LLC driver chip starts to operate.
Specifically, the self-powered module comprises a triode Q7, a resistor R27, a zener diode ZD2, a diode D5, a resistor R81 and a capacitor C2, a collector of the triode Q7 and one end of the resistor R27 are both connected with an anode of the transformer auxiliary winding, the other end of the resistor R27 and a base of the triode Q7 are both connected with a cathode of the zener diode ZD2, an emitter of the triode Q7 is connected with an anode of the diode D5, a cathode of the diode D5, one end of the resistor R81 and one end of the capacitor C2 are all connected with a VCC of the LLC driving chip U1, and an anode of the zener diode ZD2, the other end of the resistor R81, the other end of the capacitor C2 and a cathode of the transformer auxiliary winding are grounded. Preferably, the self-powered module further includes a diode D4 and a resistor R28, an anode of the diode D4 is connected to a positive electrode of the transformer auxiliary winding, a collector of the transistor Q7 and one end of the resistor R27 are both connected to one end of the resistor R28, the other end of the resistor R28 is connected to a cathode of the diode D4, and further includes a capacitor C21, a collector of the transistor Q7 and one end of the resistor R27 are both connected to one end of the capacitor C21, and the other end of the capacitor C21 is grounded. In this embodiment, the current flows into the self-powered module from the positive electrode of the auxiliary winding of the transformer, is rectified by the diode D4 to prevent the ac power from entering the circuit, and is then limited by the resistor R28 to limit the current, so as to prevent the series-connected devices from being burned out due to excessive current, and then filtered by the capacitor C21 to filter the ac component, so that the output dc is smoother. And the current is regulated and amplified by three terminals consisting of a triode Q7, a resistor R27 and a voltage stabilizing diode ZD2, and is filtered by a diode D5, a resistor R81 and a capacitor C2, so that stable voltage and current are provided for a power supply terminal VCC of the LLC driving chip U1, and the LLC driving chip U1 is ensured to normally work.
Specifically, the high-voltage self-shutdown module includes a transistor Q4, a resistor R26, a high-speed switching diode Q5 and a capacitor C7, a collector of the transistor Q4 is connected to a G-pole of a field effect transistor Q6, one end of the resistor R26, one end of the capacitor C6 and one end of the resistor R25 are all connected to a base of a transistor Q4, an emitter of the transistor Q4 and a first end of the high-speed switching diode Q5 are all grounded, a second end of the high-speed switching diode Q5 is connected to the other end of a resistor R26, a third end of the high-speed switching diode Q5 is connected to a low-level output terminal L of the LLC driver chip U1 through a capacitor C7, and specifically, the low-level output terminal L of the LLC driver chip U1 is connected to the capacitor C7 through a circuit (as shown in fig. 1) composed of a resistor R21, a diode D8, a resistor R22 and a resistor R22. In this embodiment, after the LLC driving chip U1 normally operates, the low level output terminal L of the LLC driving chip U1 transmits a pulse signal (PWM signal) to the high speed switching diode Q5 through the capacitor C7, and then the high speed switching diode Q5 transmits a high level (on voltage) to the base of the transistor Q4 through the resistor R26, so that the transistor Q4 is turned on, and since the transistor Q4 is turned on, the voltage at the G pole of the fet Q6 is pulled to ground, i.e., the fet Q6 loses the on voltage, so the fet Q6 is turned off and is not turned on, thereby turning off the high voltage self-starting module.
In this embodiment, the capacitor C6, the resistor R25, the resistor R26 and the resistor R81 form a short-circuit protection module, wherein the capacitor C6 and the resistor R25 form a time period component, one end of the resistor R26, one end of the capacitor C6 and one end of the resistor R25 are all connected to the base of the transistor Q4, the second end of the high-speed switching diode Q5 is connected to the other end of the resistor R26, the other end of the capacitor C6 and the other end of the resistor R25 are grounded, the resistor R81 is connected in parallel to the capacitor C2, preferably, the capacitor C2 is an electrochemical capacitor EC2, which has the advantages of a discharge speed block and a large number of circulations, in this embodiment, the LLC driving chip U1 enters a short-circuit protection state in case of a sudden short circuit, the low-level output terminal L of the LLC driving chip U1 stops sending pulse signals (PWM signals) to protect the whole circuit system, and then the self-power supply module stops supplying power, therefore, the resistor R81 can completely discharge the electrochemical capacitor EC2 in a very short time, and the time period component consisting of the capacitor C6 and the resistor R25 controls the turn-off and turn-on time of the transistor Q4, so that the LLC driver chip U1 can be restarted after a period, and a safe short-circuit protection and hiccup mode is formed.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.
Claims (3)
1. A short-circuit protection circuit for LLC resonant power supply characterized in that: including high pressure from start-up module, high pressure from closing module and be used for carrying out short-circuit protection ' S short-circuit protection module to LLC driver chip U1, high pressure is from start-up module including field effect transistor Q6, high pressure is from closing the module and including triode Q4 and high-speed switch diode Q5, short-circuit protection module includes time cycle subassembly and discharge protection subassembly, discharge protection subassembly is connected with working power supply, the time cycle subassembly includes electric capacity C6 and resistance R25, discharge protection subassembly includes resistance R81 and the electrochemical capacitance EC2 that is used for filtering, field effect transistor Q6 ' S D utmost point is connected with high voltage power supply, field effect transistor Q6 ' S G utmost point and triode Q4 ' S collecting electrode all are connected with high voltage power supply, field effect transistor Q6 ' S S utmost point, working power supply ' S positive pole, electrochemical capacitance EC2 ' S one end and resistance R81 ' S one end all are connected with LLC driver chip U1 ' S VCC, the third end of the high-speed switching diode Q5 is connected with the low-level output end L of the LLC driving chip U1, the second end of the high-speed switching diode Q5, one end of the capacitor C6 and one end of the resistor R25 are all connected with the base electrode of the triode Q4, and the first end of the high-speed switching diode Q5, the emitter of the triode Q4, the negative electrode of the working power supply, the other end of the electrochemical capacitor EC2 and the other end of the resistor R81 are all grounded.
2. A short-circuit protection circuit for an LLC resonant power supply as claimed in claim 1, characterized in that: the high-voltage self-starting module further comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R7, a resistor R8, a resistor R9, a resistor R10 and a zener diode ZD1, one end of the resistor R11 and one end of the resistor R17 are both connected with a high-voltage power supply, the other end of the resistor R11 is connected with one end of a resistor R14 through a resistor R12 and a resistor R13 in sequence, a collector of the triode Q4, a G pole of the field-effect tube Q6 and a cathode of the zener diode ZD1 are connected with the other end of the resistor R14, the other end of the resistor R7 is connected with one end of the resistor R9 through a resistor R8 and a resistor R9 in sequence, the other end of the resistor R9 is connected with a D pole of the field-effect tube Q9, and an anode of the zener.
3. A short-circuit protection circuit for an LLC resonant power supply as claimed in claim 1, characterized in that: the high-voltage self-closing module further comprises a resistor R26 and a capacitor C7, the third end of the high-speed switch diode Q5 is connected with the low-level output end L of the LLC driving chip U1 through the capacitor C7, the second end of the high-speed switch diode Q5 is connected with one end of a resistor R26, and the other end of the resistor R26, one end of the capacitor C6 and one end of the resistor R25 are connected with the base of the triode Q4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022619614.1U CN213661448U (en) | 2020-11-12 | 2020-11-12 | Short-circuit protection circuit for LLC resonant power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022619614.1U CN213661448U (en) | 2020-11-12 | 2020-11-12 | Short-circuit protection circuit for LLC resonant power supply |
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| CN213661448U true CN213661448U (en) | 2021-07-09 |
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| CN202022619614.1U Active CN213661448U (en) | 2020-11-12 | 2020-11-12 | Short-circuit protection circuit for LLC resonant power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115995791A (en) * | 2023-02-22 | 2023-04-21 | 广东东菱电源科技有限公司 | Short-circuit protection self-recovery circuit |
-
2020
- 2020-11-12 CN CN202022619614.1U patent/CN213661448U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115995791A (en) * | 2023-02-22 | 2023-04-21 | 广东东菱电源科技有限公司 | Short-circuit protection self-recovery circuit |
| CN115995791B (en) * | 2023-02-22 | 2023-09-15 | 广东东菱电源科技有限公司 | Short-circuit protection self-recovery circuit |
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Address after: No. 56 Nanli East Road, Shiqi Town, Panyu District, Guangzhou City, Guangdong Province, 510000 Patentee after: Guangdong Baolun Electronics Co.,Ltd. Address before: 510000 Building 1, industrial zone B, Zhongcun street, Panyu District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU ITC ELECTRONIC TECHNOLOGY Co.,Ltd. |
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