CN217769878U - Double-circuit switch power supply adopting primary isolation induction overcurrent protection and circuit thereof - Google Patents
Double-circuit switch power supply adopting primary isolation induction overcurrent protection and circuit thereof Download PDFInfo
- Publication number
- CN217769878U CN217769878U CN202122391645.0U CN202122391645U CN217769878U CN 217769878 U CN217769878 U CN 217769878U CN 202122391645 U CN202122391645 U CN 202122391645U CN 217769878 U CN217769878 U CN 217769878U
- Authority
- CN
- China
- Prior art keywords
- circuit
- diode
- resistor
- anode
- electrolytic capacitor
- 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
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a double-circuit switch power supply and a circuit thereof which adopt primary isolation induction overcurrent protection, wherein the circuit comprises a PWM control circuit, a half-bridge topology conversion circuit, an overcurrent protection circuit and an output overvoltage locking protection circuit; the PWM control circuit consists of TL494 and a peripheral circuit thereof and is used for generating an output PWM signal to control the half-bridge topology conversion circuit to work; the half-bridge topology conversion circuit comprises a bridge consisting of a switching power triode and an electrolytic capacitor and is used for receiving a PWM control circuit signal; the overcurrent protection circuit is externally connected with a half-bridge topology conversion circuit and is used for reducing output voltage and carrying out overload protection on the circuit; the output overvoltage locking protection circuit is externally connected with the PWM control circuit to perform overvoltage protection on the circuit. The utility model discloses an overcurrent protection circuit, the signal transmission of elementary response to secondary PWM pulse width control chip's comparator, the pulsewidth of power narrows down at once, has reduced output voltage, plays overload protection's effect.
Description
Technical Field
The utility model relates to a switching power supply technical field, concretely relates to adopt primary isolation response overcurrent protection's double-circuit switching power supply and circuit thereof.
Background
Switching power supplies are used as energy supply devices for industrial products. Is widely applied to various industrial energy fields. The direct current power supply equipment converts alternating current into direct current to be supplied to load equipment, and many equipment in the industrial control field need to output the direct current power supply equipment. Dc power supply devices of 100W to 150W are the most. The field of industrial control requires dc power supply equipment with multiple voltage outputs. Many systems, such as photo engraving systems, laser printing, etc., require such power supply equipment. The switch power supply has small volume and high efficiency. Stable output voltage and the like. The method is well suitable for the requirement of continuous upgrading of industrial equipment loads.
The withstand voltage of the existing switching tube of the switching power supply is not too high, the situation that the power supply fails due to the fact that the switching tube is broken down can not occur under normal conditions, but when the output voltage is too high due to abnormality, the switching tube is damaged due to the fact that the switching tube bears too high voltage, and the power utilization safety can not be guaranteed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses not enough to prior art exists provides an adopt primary isolation response overcurrent protection's double-circuit switch power supply, and concrete technical scheme is as follows:
a two-way switching power supply circuit employing primary isolation inductive overcurrent protection, the power supply circuit comprising: the device comprises a PWM control circuit, a half-bridge topology conversion circuit, an overcurrent protection circuit and an output overvoltage locking protection circuit;
the PWM control circuit consists of TL494 and peripheral circuits thereof and is used for generating output PWM signals to control the half-bridge topology conversion circuit to work;
the half-bridge topology conversion circuit is a bridge consisting of a switching power triode and an electrolytic capacitor and is used for receiving a PWM control circuit signal;
the overcurrent protection circuit is externally connected with the half-bridge topology conversion circuit and is used for reducing output voltage and carrying out overload protection on the circuit;
the output overvoltage locking protection circuit is externally connected with the PWM control circuit to perform overvoltage protection on the circuit.
As an improvement of the above technical solution, the half-bridge topology conversion circuit includes: the power supply comprises a switching power triode Q1, a switching power triode Q2, an input electrolytic capacitor C5, an input electrolytic capacitor C6, a switching transformer T1, a diode D5 and a diode D6; the collector of the switching power triode Q1 is connected with the anode of an input electrolytic capacitor C5, one end of a switching transformer T1 is connected with a bias capacitor C7 to the middle pin of the input series electrolytic capacitor C5 and the input series electrolytic capacitor C6; an emitting electrode of the switching power triode Q1 is connected with a collecting electrode of the switching power triode Q2 and then is connected to the other end of the switching transformer T1 through an N3 winding of the driving transformer T2; an emitter of the switching power triode Q2 is connected to the negative electrode of the input electrolytic capacitor C6, and the diodes D5 and D6 are respectively connected between collectors and emitters of the Q1 and the Q2 in parallel; the base electrode of the switching power triode Q1 is connected with a diode D7 in series through a resistor R7, a resistor R7A and a resistor R6, the anode of the diode D7 is connected with the anode of an electrolytic capacitor C10, the cathode of the electrolytic capacitor C10 is connected with the other end of the resistor R6, the anode of the diode D7 is connected with an N1 winding of a driving transformer T2, and the base electrode of the switching power triode Q2 is connected with a diode D8 in series through a resistor R11, a resistor R11A and a resistor R10; the anode of the diode D8 is connected with the anode of the electrolytic capacitor C11, the cathode of the capacitor C11 is connected with the other end of the resistor R10, and the anode of the diode D8 is connected with the N2 winding of the driving transformer T2.
As an improvement of the above technical solution, the overcurrent protection circuit includes: a transformer T3, a resistor R42 and a resistor R41; mutual-inductor T3 is for keeping apart the signal sampling device of response, and the primary interturn ratio is 1:50; the primary of the transformer T3 is connected in series with the primary conversion winding of the switch transformer T1, one end of the secondary of the transformer T3 is connected with the cathode of the rectifier diode D17, the anode of the diode D18 is connected with the cathode of the rectifier diode D17, the other end of the secondary of the transformer T3 is connected with the anode of the rectifier diode D19, the cathode of the diode D20 is connected with the anode of the rectifier diode D19, and the diode D18 is connected with the cathode of the rectifier diode D19; the anode of the electrolytic capacitor C31, the anode of the rectifier diode D17 and the anode of the diode D20 are connected; the cathode of the electrolytic capacitor C31 is grounded, the two ends of the transformer T3 are connected with the resistor R39 and the capacitor C32 in parallel, and the common end of the resistor R42 and the resistor R41 is connected to the non-inverting input end of the 16-pin error amplifier I of the TL 494.
As an improvement of the above technical solution, the output overvoltage lock protection circuit includes: a voltage regulator DZ1, a resistor R46, a silicon controlled rectifier SCR and an electrolytic capacitor C35; the negative pole of the voltage-stabilizing tube DZ1 is connected with the positive pole of the output of the circuit, and the voltage-stabilizing tube DZ1 is connected with the series resistor R46 and the grid electrode of the SCR; the cathode of the silicon controlled rectifier SCR is grounded, a resistor R44 and a capacitor C38 are connected between the grid and the cathode in parallel, the anode of the silicon controlled rectifier SCR is respectively connected with the cathode of the diode D24 and the cathode of the diode D23 through a series resistor R45, the anode of the electrolytic capacitor C35 is connected with the cathode of the diode D24, and the cathode of the electrolytic capacitor C35 is grounded; the anode of the diode D24 is connected with the twelve-pin VCC of the TL494, and the anode of the diode D23 is connected with the center tap end of the driving transformer.
In order to solve the technical problem, the utility model discloses still provide an adopt primary isolation response overcurrent protection's double-circuit switch power supply, including any kind of above-mentioned double-circuit switch power supply circuit who adopts primary isolation response overcurrent protection.
Compared with the prior art, the utility model, its technical effect as follows:
the utility model relates to an adopt primary isolated induction overcurrent protection's double-circuit switch power supply, through the overcurrent protection circuit, after the signal of primary response was transmitted to the comparator in the secondary PWM pulse width control chip TL494 after being enlargied, TL494 chip produced the protection signal, the pulse width of power narrowed immediately, reduced output voltage, played overload protection's effect;
a adopt primary isolation response overcurrent protection's double-circuit switch power supply, through output overvoltage locking protection circuit, when output voltage risees, reach the threshold value of excessive pressure, stabilivolt DZ1 switches on and produces electric current, make silicon controlled rectifier SCR switch on through resistance and diode D23, diode D24 draws the voltage of TL494 twelve feet VCC and driving transformer center tap end to ground, and the maintenance state is unchangeable, when drive end and VCC terminal voltage all are zero potential, TL494 no longer works, and by the locking, the output is turn-off, thereby play overvoltage protection's effect.
Drawings
Fig. 1 is a schematic structural diagram of a two-way switching power supply circuit adopting primary isolation induction overcurrent protection according to the present invention;
fig. 2 is a schematic diagram of a half-bridge topology conversion circuit structure according to the present invention;
fig. 3 is a schematic diagram of the structure of the over-current protection circuit of the present invention;
fig. 4 is a schematic diagram of the output overvoltage locking protection circuit of the present invention;
fig. 5 is an internal structure diagram of the TL494 control chip according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention 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 merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Examples
As shown in fig. 1, a two-way switch power supply circuit who adopts elementary isolation response overcurrent protection, power supply circuit includes: the device comprises a PWM control circuit, a half-bridge topology conversion circuit, an overcurrent protection circuit and an output overvoltage locking protection circuit; the PWM control circuit consists of TL494 and peripheral circuits thereof and is used for generating output PWM signals to control the half-bridge topology conversion circuit to work; the half-bridge topology conversion circuit comprises a bridge consisting of a switching power triode and an electrolytic capacitor and is used for receiving a PWM control circuit signal; the overcurrent protection circuit is externally connected with the half-bridge topology conversion circuit and is used for reducing output voltage and carrying out overload protection on the circuit; the output overvoltage locking protection circuit is externally connected with the PWM control circuit to perform overvoltage protection on the circuit.
As shown in fig. 1 and 5, the TL494 chip is used and functions as a pulse width modulation circuit, and is widely applied to single-ended forward double-tube, half-bridge, and full-bridge switching power supplies. The TL494 chip and the peripheral circuit thereof are a pulse width modulation circuit with fixed frequency, a linear sawtooth wave oscillator is arranged in the TL494 chip, the oscillation frequency can be adjusted by an external resistor and a capacitor, and the width of the output pulse is realized by comparing the positive polarity sawtooth wave voltage on the capacitor CT with the other two control signals. The switching power output tubes Q1 and Q2 are controlled by nor gates. The toggle flip-flop is gated when its clock signal is low, i.e., only during the period when the sawtooth voltage is greater than the control signal. When the control signal increases, the width of the output pulse will decrease. When the comparator CT discharges, a positive pulse appears at the output end of the dead-zone comparator, the bistable trigger constrained by the pulse counts time, and the output tubes Q1 and Q2 stop working at the same time. If the output control terminal is connected to a reference voltage source, the modulation pulse is alternately output to the two output transistors, and the output frequency is equal to half of the pulse oscillator. If the circuit is operated in a single-ended state and the maximum duty ratio is less than 50%, the output driving signal is obtained from the transistor Q1 or the transistor Q2 respectively. A feedback winding and a diode of the output transformer provide feedback voltage. In the single-end working mode, when a higher driving current output is required, the Q1 and the Q2 can also be used in parallel, and at this time, the output mode control pin needs to be grounded so as to close the bistable trigger.
As shown in fig. 2, the half-bridge topology conversion circuit includes: the power supply comprises a switching power triode Q1, a switching power triode Q2, an input electrolytic capacitor C5, an input electrolytic capacitor C6, a switching transformer T1, a diode D5 and a diode D6; the collector of the switching power triode Q1 is connected with the anode of an input electrolytic capacitor C5, one end of a switching transformer T1 is connected with a bias capacitor C7 to the middle pin of the input series electrolytic capacitor C5 and the input series electrolytic capacitor C6; an emitting electrode of the switching power triode Q1 is connected with a collecting electrode of the switching power triode Q2 and then is connected to the other end of the switching transformer T1 through an N3 winding of the driving transformer T2; the emitter of the switching power triode Q2 is connected to the negative electrode of the input electrolytic capacitor C6, and the diodes D5 and D6 are respectively connected between the collector and the emitter of the Q1 and the Q2 in parallel; the base electrode of the switching power triode Q1 is connected with a diode D7 in series through a resistor R7, a resistor R7A and a resistor R6, the anode of the diode D7 is connected with the anode of an electrolytic capacitor C10, the cathode of the electrolytic capacitor C10 is connected with the other end of the resistor R6, the anode of the diode D7 is connected with an N1 winding of a driving transformer T2, and the base electrode of the switching power triode Q2 is connected with a diode D8 in series through a resistor R11, a resistor R11A and a resistor R10; the anode of the diode D8 is connected with the anode of the electrolytic capacitor C11, the cathode of the capacitor C11 is connected with the other end of the resistor R10, and the anode of the diode D8 is connected with the N2 winding of the driving transformer T2.
As shown in fig. 3, the overcurrent protection circuit includes: a mutual inductor T3, a resistor R42 and a resistor R41; mutual-inductor T3 is for keeping apart the signal sampling device of response, and first turn-between ratio is 1:50; the primary of the transformer T3 is connected in series with the primary conversion winding of the switch transformer T1, one end of the secondary of the transformer T3 is connected with the cathode of the rectifier diode D17, the anode of the diode D18 is connected with the cathode of the rectifier diode D17, the other end of the secondary of the transformer T3 is connected with the anode of the rectifier diode D19, the cathode of the diode D20 is connected with the anode of the rectifier diode D19, and the diode D18 is connected with the cathode of the rectifier diode D19; the anode of the electrolytic capacitor C31, the anode of the rectifier diode D17 and the anode of the diode D20 are connected; the negative electrode of the electrolytic capacitor C31 is grounded, two ends of the mutual inductor T3 are provided with the resistor R39 and the capacitor C32 to play a role in stabilizing, a direct-current voltage signal is generated after rectification and filtering are completed, the resistor R42 and the resistor R41 are subjected to voltage division operation to obtain a required overcurrent signal value, the common end of the resistor R42 and the resistor R41 is connected to the non-inverting input end of a 16-pin error amplifier I of TL494, after the output end is compared with a slope by an error amplifier, the pulse control width is adjusted, the duty ratio is adjusted, the output voltage is reduced, and the overcurrent protection effect is played.
As shown in fig. 4, the output overvoltage lock protection circuit includes: a voltage regulator tube DZ1, a resistor R46, a silicon controlled rectifier SCR and an electrolytic capacitor C35; the negative pole of the voltage-stabilizing tube DZ1 is connected with the positive pole of the output of the circuit, and the voltage-stabilizing tube DZ1 is connected with the series resistor R46 and the grid electrode of the SCR; the cathode of the silicon controlled rectifier SCR is grounded, a resistor R44 and a capacitor C38 are connected between the grid and the cathode in parallel, the anode of the silicon controlled rectifier SCR is respectively connected with the cathode of the diode D24 and the cathode of the diode D23 through a series resistor R45, the anode of the electrolytic capacitor C35 is connected with the cathode of the diode D24, and the cathode of the electrolytic capacitor C35 is grounded; the anode of the diode D24 is connected with the twelve-pin VCC of the TL494, the anode of the diode D23 is connected with the center tap end of the driving transformer, when the output voltage rises and reaches the threshold value of overvoltage, the voltage regulator tube DZ1 is conducted to generate current, so that the SCR is conducted through the resistor and the diode D23, the diode D24 pulls the voltage of the twelve-pin VCC of the TL494 and the center tap end of the driving transformer to the ground and maintains the state unchanged, when the voltage of the driving end and the voltage of the VCC end are both zero potential, the TL494 does not work any more and is locked, the output is turned off, and the overvoltage protection function is achieved.
Output overvoltage locking protection circuit adopts silicon controlled rectifier SCR as the device that the locking was turn-offed, consequently has the characteristic of holding current, can keep the state of the turn-offed of locking.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A two-way switch power supply circuit adopting primary isolation induction overcurrent protection is characterized in that: the two-way switch power supply circuit adopting primary isolation induction overcurrent protection comprises: the device comprises a PWM control circuit, a half-bridge topology conversion circuit, an overcurrent protection circuit and an output overvoltage locking protection circuit;
the PWM control circuit consists of TL494 and a peripheral circuit thereof and is used for generating an output PWM signal to control the half-bridge topology conversion circuit to work;
the half-bridge topology conversion circuit is a bridge consisting of a switching power triode and an electrolytic capacitor and is used for receiving a PWM control circuit signal;
the overcurrent protection circuit is externally connected with the half-bridge topology conversion circuit and is used for reducing output voltage and carrying out overload protection on the circuit;
the output overvoltage locking protection circuit is externally connected with the PWM control circuit to perform overvoltage protection on the circuit.
2. The two-way switching power supply circuit adopting primary isolation induction overcurrent protection as claimed in claim 1, wherein: the half-bridge topology conversion circuit comprises: the power supply comprises a switching power triode Q1, a switching power triode Q2, an input electrolytic capacitor C5, an input electrolytic capacitor C6, a switching transformer T1, a diode D5 and a diode D6; the collector of the switching power triode Q1 is connected with the anode of an input electrolytic capacitor C5, and one end of a switching transformer T1 is connected with a bias capacitor C7 to the middle pin of the input series electrolytic capacitor C5 and the middle pin of the input series electrolytic capacitor C6; an emitting electrode of the switching power triode Q1 is connected with a collecting electrode of the switching power triode Q2 and then is connected to the other end of the switching transformer T1 through an N3 winding of the driving transformer T2; an emitter of the switching power triode Q2 is connected to the negative electrode of the input electrolytic capacitor C6, and the diodes D5 and D6 are respectively connected between collectors and emitters of the Q1 and the Q2 in parallel; the base electrode of the switching power triode Q1 is connected with a diode D7 in series through a resistor R7, a resistor R7A and a resistor R6, the anode of the diode D7 is connected with the anode of an electrolytic capacitor C10, the cathode of the electrolytic capacitor C10 is connected with the other end of the resistor R6, the anode of the diode D7 is connected with an N1 winding of a driving transformer T2, and the base electrode of the switching power triode Q2 is connected with a diode D8 in series through a resistor R11, a resistor R11A and a resistor R10; the anode of the diode D8 is connected with the anode of the electrolytic capacitor C11, the cathode of the capacitor C11 is connected with the other end of the resistor R10, and the anode of the diode D8 is connected with the N2 winding of the driving transformer T2.
3. The two-way switching power supply circuit adopting primary isolation induction overcurrent protection as claimed in claim 1, wherein: the overcurrent protection circuit includes: a mutual inductor T3, a resistor R42 and a resistor R41; mutual-inductor T3 is for keeping apart the signal sampling device of response, and first inter-turn ratio is 1:50; the primary of the transformer T3 is connected in series with the primary conversion winding of the switch transformer T1, one end of the secondary of the transformer T3 is connected with the cathode of the rectifier diode D17, the anode of the diode D18 is connected with the cathode of the rectifier diode D17, the other end of the secondary of the transformer T3 is connected with the anode of the rectifier diode D19, the cathode of the diode D20 is connected with the anode of the rectifier diode D19, and the diode D18 is connected with the cathode of the rectifier diode D19; the anode of the electrolytic capacitor C31, the anode of the rectifier diode D17 and the anode of the diode D20 are connected; the cathode of the electrolytic capacitor C31 is grounded, two ends of the transformer T3 are connected in parallel with the resistor R39 and the capacitor C32, and the common end of the resistor R42 and the resistor R41 is connected to the non-inverting input end of the 16-pin error amplifier I of the TL 494.
4. The two-way switching power supply circuit adopting primary isolation induction overcurrent protection as claimed in claim 1, wherein: the output overvoltage lock protection circuit includes: a voltage regulator DZ1, a resistor R46, a silicon controlled rectifier SCR and an electrolytic capacitor C35; the negative electrode of the voltage-stabilizing tube DZ1 is connected with the positive electrode of the output of the circuit, and the voltage-stabilizing tube DZ1 is connected with a series resistor R46 and the grid electrode of the silicon controlled rectifier SCR; the cathode of the silicon controlled rectifier SCR is grounded, a resistor R44 and a capacitor C38 are connected between the grid and the cathode in parallel, the anode of the silicon controlled rectifier SCR is respectively connected with the cathode of the diode D24 and the cathode of the diode D23 through a series resistor R45, the anode of the electrolytic capacitor C35 is connected with the cathode of the diode D24, and the cathode of the electrolytic capacitor C35 is grounded; the anode of the diode D24 is connected with the twelve-pin VCC of the TL494, and the anode of the diode D23 is connected with the center tap end of the driving transformer.
5. The utility model provides an adopt primary isolation response overcurrent protection's double-circuit switching power supply which characterized in that: a two-way switching power supply circuit including a primary isolation sensing overcurrent protection as claimed in any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122391645.0U CN217769878U (en) | 2021-09-30 | 2021-09-30 | Double-circuit switch power supply adopting primary isolation induction overcurrent protection and circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122391645.0U CN217769878U (en) | 2021-09-30 | 2021-09-30 | Double-circuit switch power supply adopting primary isolation induction overcurrent protection and circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217769878U true CN217769878U (en) | 2022-11-08 |
Family
ID=83868929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122391645.0U Active CN217769878U (en) | 2021-09-30 | 2021-09-30 | Double-circuit switch power supply adopting primary isolation induction overcurrent protection and circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217769878U (en) |
-
2021
- 2021-09-30 CN CN202122391645.0U patent/CN217769878U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Dudrik et al. | Zero-voltage and zero-current switching full-bridge DC–DC converter with auxiliary transformer | |
| CN101951716A (en) | Constant-on-time primary side constant-current control device for LED driver with high power factor | |
| CN109217660B (en) | DC/DC boost converter | |
| CN101667783A (en) | Synchronous rectification drive device and method for converter | |
| US6529390B2 (en) | Switching power supply circuit | |
| CN110572014B (en) | MOS tube driving circuit with turn-off negative voltage | |
| CN213027829U (en) | Double-transformer push-pull circuit suitable for inverter | |
| CN217769878U (en) | Double-circuit switch power supply adopting primary isolation induction overcurrent protection and circuit thereof | |
| CN105915061A (en) | Integration forward-flyback circuit employed by leakage inductance energy | |
| CN219164218U (en) | Protection circuit of auxiliary power supply, auxiliary power supply and photovoltaic inverter system | |
| CN209881671U (en) | Single-inductor double-Boost bridgeless PFC converter | |
| CN210405095U (en) | Detection circuit, switch control circuit and flyback conversion circuit | |
| CN111786562A (en) | Leakage inductance energy absorption and feedback method for transformer | |
| CN217465816U (en) | Error signal eliminating circuit and sensor | |
| CN216751537U (en) | Direct circuit applied to buck converter | |
| CN214708113U (en) | Linear LED drive circuit | |
| US20210226533A1 (en) | Converter, step-down method based on the converter and electronic device | |
| CN110118903B (en) | Equivalent full-power test circuit for direct-current port of power electronic transformer and control method | |
| Halder | An improved hybrid energy recovery soft switching snubber for the flyback converter | |
| CN113015290A (en) | Linear LED drive circuit | |
| CN114365407A (en) | Totem-pole bridgeless power factor correction circuit and power electronic equipment | |
| CN113541488B (en) | Boost chopper circuit, protection circuit, control method, equipment and vehicle | |
| CN211018652U (en) | Novel slope compensation circuit and switching power supply | |
| CN211151810U (en) | Passive buffer circuit of Buck converter | |
| CN218587077U (en) | Inductance current detection and overcurrent protection structure of BUCK circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |