CN115995791B - Short-circuit protection self-recovery circuit - Google Patents
Short-circuit protection self-recovery circuit Download PDFInfo
- Publication number
- CN115995791B CN115995791B CN202310163041.1A CN202310163041A CN115995791B CN 115995791 B CN115995791 B CN 115995791B CN 202310163041 A CN202310163041 A CN 202310163041A CN 115995791 B CN115995791 B CN 115995791B
- Authority
- CN
- China
- Prior art keywords
- control unit
- main control
- resistor
- capacitor
- voltage
- 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
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
- Dc-Dc Converters (AREA)
Abstract
A short-circuit protection self-recovery circuit comprising; one end of the resistor R3 is connected with the CS end of the main control unit U1 and is also connected with the grounding end of the main control unit U1 through a capacitor C3; the main control unit U2, one end of the main control unit U2 is connected with the other end of the resistor R3, the other end of the main control unit U2 is connected with the resistor R1, and the main control unit U2 is also grounded; the resistor R1 is also connected with the driving module, and the accurate 1.25V clamping circuit formed by R1 and U2 is utilized, after the output abnormality is eliminated, CS+ is restored to be less than 0.8V, LLC enters a normal working mode, and the power supply is restored to work stably.
Description
Technical Field
The application relates to the field of LED power supplies, in particular to a short-circuit protection self-recovery circuit.
Background
In recent years, an LED outdoor power supply is gradually developed to a middle and high power direction. The LED power supply is gradually miniaturized, increased in frequency, and increased in power density. Only extremely power source products with high efficiency can be small in size, high in power density and LLC soft switching technology is gradually applied to medium and high power products due to good cost performance. In order to reliably protect products from damage under abnormal conditions such as overload and output short circuit, some LLC special IC pins have overcurrent overload protection functions, some ICs can hiccup protection work under abnormal conditions such as output overload and short circuit, and can automatically recover to be normal after abnormal elimination, but the price of the ICs is relatively expensive, the goods source is also relatively tension, more conventional LLC ICs can enter a locking state when the output is abnormally overloaded or short circuit, the power supply stops working, and the ICs can work again only after the input is powered off, the power supply is completely discharged and then powered on. Such an IC comparison is representative as L6599. Such ICs are inexpensive, have sufficient sources, and are being used in large scale by many more power vendors. Because the working environment of the LED outdoor power supply is bad, the phenomenon of output instant overload short circuit often occurs, and the power supply stops working.
Disclosure of Invention
In order to solve the problems, the technical scheme provides a short-circuit protection self-recovery circuit, and the circuit can achieve self-recovery operation after power supply abnormality elimination through fewer low-cost elements on the periphery.
In order to achieve the above purpose, the technical scheme is as follows:
a short-circuit protection self-recovery circuit comprising;
one end of the resistor R3 is connected with the CS end of the main control unit U1 and is also connected with the grounding end of the main control unit U1 through a capacitor C3;
the main control unit U2, one end of the main control unit U2 is connected with the other end of the resistor R3, the other end of the main control unit U2 is connected with the resistor R1, and the main control unit U2 is also grounded;
the resistor R1 is also connected with the driving module.
In some embodiments, the master unit U2 is model TL432, and the reference voltage is 1.25V.
In some embodiments, the driving module includes an input end VBUS, the input end VBUS is grounded through a MOS tube Q1 and a MOS tube Q2 in sequence, the MOS tube Q1 is further connected with an inductor LR, the inductor LR is connected with one end of a transformer T1, and the other end of the transformer T1 is grounded through a capacitor CR.
In some embodiments, a capacitor C1 is further connected to the other end of the transformer T1, and the capacitor C1 is grounded through a diode D2.
In some embodiments, the capacitor C1 is further connected to a diode D1, the diode D1 is connected to the resistor R1, the diode D1 is further grounded through a resistor R2, and the diode D1 is further grounded through the capacitor C2.
The application has the beneficial effects that:
the application utilizes an accurate 1.25V clamping circuit formed by R1 and U2, the clamping circuit does not act when the CS+ of an LLC sampling signal is lower than 1.25V, the CS+ sampling signal is transmitted to a CS signal pin of U1 in a lossless way after being filtered by R3 and C3, when the LLC sampling signal is higher than 1.25V (the output overload or short circuit is necessarily higher than the value), the signal is clamped at the amplitude of 1.25V after passing through R1 and U2, the LLC enters a hiccup intermittent working mode, the CS+ is restored to be lower than 0.8V after the output abnormality is eliminated, the LLC enters a normal working mode, and the power supply is restored to work stably. The circuit effect is remarkable in some projects of companies using such ICs.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic structural view of an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the application more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Referring to fig. 1, a short-circuit protection self-recovery circuit includes;
one end of the resistor R3 is connected with the CS end of the main control unit U1, and is also connected with the grounding end of the main control unit U1 through the capacitor C3, and the resistor R3 and the capacitor C3 play a role in filtering to prevent false action protection caused by instant spikes;
the main control unit U2, one end of the main control unit U2 is connected with the other end of the resistor R3, the other end of the main control unit U2 is connected with the resistor R1, and the main control unit U2 is also grounded;
the resistor R1 is also connected with the driving module.
Specifically, the model of the master control unit U2 is TL432, and the reference voltage is 1.25V.
Specifically, the driving module comprises an input end VBUS, the input end VBUS is grounded through a MOS tube Q1 and a MOS tube Q2 in sequence, the MOS tube Q1 is further connected with an inductor LR, the inductor LR is connected with one end of a transformer T1, and the other end of the transformer T1 is grounded through a capacitor CR.
Specifically, the other end of the transformer T1 is further connected to a capacitor C1, and the capacitor C1 is grounded through a diode D2.
Specifically, the capacitor C1 is further connected to a diode D1, the diode D1 is connected to the resistor R1, the diode D1 is further grounded through a resistor R2, and the diode D1 is further grounded through the capacitor C2.
The LLC chip in the circuit is of a common type (L6599 is representative for an IC, the working principle is illustrated by taking this as an example), the 6 pin CS of the U1 is an overload protection pin, the power supply works normally when the sampling voltage CS is less than 0.8V, the power supply hiccup works when the sampling voltage CS is less than 0.8V and is more than 1.5V, the power supply stops working when the sampling voltage CS is more than 1.5V, and the power supply can work again only after the input power-off power supply is completely discharged. The 6 pin voltage of U1 is lower than 0.8V during normal operation, the power supply is operating normally because no trigger is reached to the protection point, and the IC reference voltage is 1.25V because IC U2 is TL432 when the output is overloaded or shorted, using the below-described legged patent circuit. An accurate 1.25V clamping circuit is formed by R1 and U2 to ensure that a 6-pin CS signal flowing into an IC U1 is always smaller than 1.5V, so that when overload or short circuit occurs to a power supply, the power supply always enters a hiccup intermittent working state, and after abnormal output is eliminated, the power supply returns to normal work.
Specifically, the cs+ input signal is a sampling signal obtained by rectifying and filtering the voltage on the resonant capacitor CR of the LLC resonant cavity (this area circuit is not described in detail in the patent scope), the cs+ sampling input signal is connected to pin 1 of the resistor R1, pin 2 of the resistor R1 is connected to pin 2 of pin U2, pin 1 of R3, the intersection point forms an endpoint VR signal, pin 2 of R3 is connected to pin 1 of C3 and pin 6 of U1, pin 2 of C3, and pin 3 of U2 and pin 10 of U1 are commonly connected to GND.
During normal operation, the voltage on the CR capacitor is not increased, so that the CS+ sampling voltage is less than 0.8V in the normal range, the signal is sent to the 6-pin CS terminal of U1 through resistors R1, U2, R3 and C3, and the U2 does not play a role in embedding voltage because the CS+ signal does not reach the embedded reference voltage 1.25V of U2, the CS+ signal is completely transmitted to the 6-pin CS terminal of U1, and the power supply works normally. When the power supply output is overloaded or short-circuited, the voltage on the resonant capacitor CR is greatly increased, the CS+ sampling signal is increased along with the increase, when the voltage exceeds 1.25V, the signal is accurately embedded at 1.25V through R1 and U2, the 1.25V signal voltage on the VR node is transmitted to the 6-pin CS end of U1 after being filtered by R3 and C3, and the 1.25V signal is smaller than the 1.5V of the 6-pin locking voltage signal of U1, so that the power supply always works in a hiccup working state, and when the output is abnormally disappeared, the power supply is restored to normal work. The above-mentioned working process is repeatedly performed according to the output state.
The foregoing description of the preferred embodiments of the present application is not intended to limit the scope of the application, but rather is presented in the claims.
Claims (5)
1. A short-circuit protection self-recovery circuit, comprising;
one end of the resistor R3 is connected with the CS end of the main control unit U1 and is also connected with the grounding end of the main control unit U1 through a capacitor C3;
the main control unit U2, one end of the main control unit U2 is connected with the other end of the resistor R3, the other end of the main control unit U2 is connected with the resistor R1, and the main control unit U2 is also grounded;
the resistor R1 is also connected with the driving module;
during normal operation, the voltage on the capacitor CR is not increased, so that the CS+ sampling voltage of the main control unit U1 is in a normal range, the signal is sent to the CS endpoint of the main control unit U1 through the resistor R1, the main control unit U2, the resistor R3 and the capacitor C3, and the main control unit U2 does not play a role in embedding because the CS+ signal does not reach the embedding reference voltage of the main control unit U2, the CS+ signal is completely transmitted to the CS end of the main control unit U1, and the power supply works normally; when the power supply output is overloaded or short-circuited, the voltage on the capacitor CR is greatly increased, the CS+ sampling signal is increased, when the voltage exceeds 1.25V, the signal passes through the resistor R1, the main control unit U2 is accurately embedded at 1.25V, the voltage of the 1.25V signal passes through the resistor R3 on the VR node, the filtered voltage of the capacitor C3 is sent to the CS end of the main control unit U1, and the power supply always works in a hiccup working state because the 1.25V signal is smaller than the locking voltage signal of the main control unit U1, and when the output is abnormally disappeared, the power supply returns to normal work, and the working process is repeatedly performed according to the output state.
2. A short-circuit protection self-recovery circuit according to claim 1, characterized in that: the model of the main control unit U2 is TL432, and the reference voltage is 1.25V.
3. A short-circuit protection self-recovery circuit according to claim 1, characterized in that: the driving module comprises an input end VBUS, the input end VBUS is grounded through a MOS tube Q1 and a MOS tube Q2 in sequence, the MOS tube Q1 is further connected with an inductor LR, the inductor LR is connected with one end of a transformer T1, and the other end of the transformer T1 is grounded through a capacitor CR.
4. A short-circuit protection self-healing circuit according to claim 3, wherein: the other end of the transformer T1 is also connected with a capacitor C1, and the capacitor C1 is grounded through a diode D2.
5. The short-circuit protection self-recovery circuit according to claim 4, wherein: the capacitor C1 is further connected with a diode D1, the diode D1 is connected with the resistor R1, the diode D1 is further grounded through a resistor R2, and the diode D1 is further grounded through the capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310163041.1A CN115995791B (en) | 2023-02-22 | 2023-02-22 | Short-circuit protection self-recovery circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310163041.1A CN115995791B (en) | 2023-02-22 | 2023-02-22 | Short-circuit protection self-recovery circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115995791A CN115995791A (en) | 2023-04-21 |
| CN115995791B true CN115995791B (en) | 2023-09-15 |
Family
ID=85993555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310163041.1A Active CN115995791B (en) | 2023-02-22 | 2023-02-22 | Short-circuit protection self-recovery circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115995791B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5498936A (en) * | 1995-03-31 | 1996-03-12 | Smith; Jerry J. | Power system with simplified, low cost self-starting self oscillator, power factor correction, power regulation and output open circuit voltage regulation, overload and short circuit protection |
| CN201369555Y (en) * | 2009-01-16 | 2009-12-23 | 上海新时达电气股份有限公司 | Short-circuit protection circuit of switching power supply for frequency converter |
| CN203632222U (en) * | 2013-11-01 | 2014-06-04 | 广州市爱浦电子科技有限公司 | Output short circuit protection circuit of flyback converter |
| WO2015070492A1 (en) * | 2013-11-13 | 2015-05-21 | 深圳市东方之星电源有限公司 | Open-loop hiccup protective circuit of constant-current power supply |
| CN210156915U (en) * | 2019-04-08 | 2020-03-17 | 北京承力电源有限公司 | Controllable time delay hiccup formula output short-circuit protection circuit of switching power supply |
| CN213661448U (en) * | 2020-11-12 | 2021-07-09 | 广州市保伦电子有限公司 | Short-circuit protection circuit for LLC resonant power supply |
| CN218335745U (en) * | 2022-08-16 | 2023-01-17 | 广州金升阳科技有限公司 | Output short-circuit protection signal generating circuit and LLC half-bridge resonant converter |
-
2023
- 2023-02-22 CN CN202310163041.1A patent/CN115995791B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5498936A (en) * | 1995-03-31 | 1996-03-12 | Smith; Jerry J. | Power system with simplified, low cost self-starting self oscillator, power factor correction, power regulation and output open circuit voltage regulation, overload and short circuit protection |
| CN201369555Y (en) * | 2009-01-16 | 2009-12-23 | 上海新时达电气股份有限公司 | Short-circuit protection circuit of switching power supply for frequency converter |
| CN203632222U (en) * | 2013-11-01 | 2014-06-04 | 广州市爱浦电子科技有限公司 | Output short circuit protection circuit of flyback converter |
| WO2015070492A1 (en) * | 2013-11-13 | 2015-05-21 | 深圳市东方之星电源有限公司 | Open-loop hiccup protective circuit of constant-current power supply |
| CN210156915U (en) * | 2019-04-08 | 2020-03-17 | 北京承力电源有限公司 | Controllable time delay hiccup formula output short-circuit protection circuit of switching power supply |
| CN213661448U (en) * | 2020-11-12 | 2021-07-09 | 广州市保伦电子有限公司 | Short-circuit protection circuit for LLC resonant power supply |
| CN218335745U (en) * | 2022-08-16 | 2023-01-17 | 广州金升阳科技有限公司 | Output short-circuit protection signal generating circuit and LLC half-bridge resonant converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115995791A (en) | 2023-04-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206096314U (en) | Power failure detection system and electric meter system | |
| CN108768381B (en) | GPIO circuit and chip | |
| CN208158102U (en) | Switching Power Supply and its switching tube protection circuit | |
| CN211429601U (en) | Open circuit and short circuit detection circuit and LED switching power supply control system | |
| CN203205843U (en) | Output overcurrent protective circuit | |
| CN111934304B (en) | Protection circuit and protection method for preventing hot plug voltage surge | |
| CN103105821A (en) | Machine tool processing coordinate power down saving system and method | |
| CN115995791B (en) | Short-circuit protection self-recovery circuit | |
| CN209150711U (en) | Undervoltage protection system, under-voltage protecting circuit and Switching Power Supply | |
| CN107969048B (en) | Output overvoltage protection circuit | |
| CN106300642A (en) | A kind of dual power supply redundancy cold standby circuit with power supply status output | |
| CN205960624U (en) | Switch power -supply overvoltage protecting circuit | |
| CN209992566U (en) | Optical coupling isolation input voltage under-voltage detection circuit | |
| CN209104785U (en) | A kind of current foldback circuit | |
| CN114710018B (en) | PFC (power factor correction) protection circuit for quick startup and shutdown | |
| CN115622183A (en) | Control circuit for preventing hot plug during charging of high-voltage lithium battery | |
| CN214412262U (en) | Protection circuit, circuit board and protection system | |
| CN210693431U (en) | Simple, practical and automatic-recovery input overvoltage protection circuit | |
| CN208548348U (en) | A kind of semiconductor power device of band detection and defencive function | |
| CN219302630U (en) | 24V power supply monitoring circuit of signal acquisition circuit controller | |
| CN210468787U (en) | Direct current power supply output overvoltage protection circuit | |
| CN215221704U (en) | Overcurrent protection circuit with self-recovery function | |
| CN215870743U (en) | Fault protection circuit | |
| CN220173216U (en) | Reset circuit and electronic equipment | |
| CN220041072U (en) | Anti-interference low-power-consumption power-on reset circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |