CN219592272U

CN219592272U - Quick start circuit

Info

Publication number: CN219592272U
Application number: CN202321673336.5U
Authority: CN
Inventors: 邓超; 罗立智; 唐乐; 袁灿文
Original assignee: Guangdong OML Technology Co Ltd
Current assignee: Guangdong OML Technology Co Ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2023-08-25
Anticipated expiration: 2033-06-29

Abstract

The quick starting circuit comprises an input end, wherein the input end is connected with a base electrode of a triode Q2 through a resistor R24 and a resistor R21, the input end is connected with a collector electrode of the triode Q2 through a resistor R43 and a resistor R23, an emitter electrode of the triode Q2 is grounded through a charging capacitor EC1, and the charging capacitor EC1 is also connected with the input end of a main control chip; meanwhile, when the power fails, the purpose of shortening the restarting of the power supply and reducing the input power consumption of the power failure can be achieved when the low voltage is input by 100V.

Description

Quick start circuit

Technical Field

The utility model relates to the field of LED switching power supplies, in particular to a quick starting circuit.

Background

The starting circuit of the switching power supply is generally a circuit that a power supply charges an energy storage capacitor of a power supply control chip through input voltage; when the voltage value of the energy storage capacitor reaches the starting threshold voltage value of the control chip, the chip starts to work, and the power tube is turned on and off to generate output stable voltage. If the charging current is increased, the starting time of the power supply is shortened, but the time between restarting of the power supply due to faults is shortened, so that the input power of the power supply in fault is increased; if the charging current is reduced, the time between the restarting of the power supply and the failure of the power supply becomes longer, the average power input at the time of the failure of the power supply decreases, but the starting time of the power supply becomes longer.

Disclosure of Invention

In order to solve the problems, the technical scheme provides a quick starting circuit.

In order to achieve the above purpose, the technical scheme is as follows:

the quick starting circuit comprises an input end, wherein the input end is connected with a base electrode of a triode Q2 through a resistor R24 and a resistor R21, the input end is connected with a collector electrode of the triode Q2 through a resistor R43 and a resistor R23, an emitter electrode of the triode Q2 is grounded through a charging capacitor EC1, and the charging capacitor EC1 is also connected with an input end of a main control chip.

In some embodiments, the resistor R21 is further grounded through a capacitor C6 and a diode D7, and one end of the diode D7 is connected to the base of the transistor Q2.

In some embodiments, the charging capacitor EC1 is connected to the input terminal of the main control chip through a resistor R36.

In some embodiments, a power switching circuit is also included.

In some embodiments, the power switching circuit includes a master unit U2, the master unit U2 being configured to transmit a PWM1 signal and a PWM2 signal;

the first switching module comprises a switching unit U1 which receives a PWM1 signal of the main control unit U2 to output first power;

the second switching module comprises a switching unit U1-1 which receives the PWM2 signal of the main control unit U2 to output second power.

In some embodiments, the output ends of the first switching module and the second switching module are respectively provided with a constant voltage and constant current module, and the constant voltage and constant current modules are switched to different powers through a switch.

In some embodiments, the output end of the switching unit U1 is connected to an inductor L5 through a resistor R36, the inductor L5 is connected to a resistor R28, and a common junction between the inductor L5 and the resistor R28 is connected to the sampling end of the switching unit U1.

The utility model has the beneficial effects that:

the utility model can work in a large charging current mode when being started for the first time, thereby achieving the purpose of quickly starting the switching power supply; meanwhile, when the power fails, the purpose of shortening the restarting of the power supply and reducing the input power consumption of the power failure can be achieved when the low voltage is input by 100V.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below.

Fig. 1 is a schematic circuit diagram of an embodiment of the present utility model.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model 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 utility model.

Referring to fig. 1, the fast start circuit includes an input end, the input end is connected with a base electrode of a triode Q2 through a resistor R24 and a resistor R21, the input end is connected with a collector electrode of the triode Q2 through a resistor R43 and a resistor R23, an emitter electrode of the triode Q2 is grounded through a charging capacitor EC1, and the charging capacitor EC1 is also connected with an input end of a main control chip.

When the power supply is started for the first time, the triode is conducted at the input end, so that the input end charges the charging capacitor EC1 through the resistor R43 and the resistor R23, meanwhile, the input end supplies power to VIN of the chip U3 through the resistor R19, the resistor R1, the resistor R2 and the resistor R36, and when the power supply is restarted, the charging capacitor EC1 discharges, and then the chip U3 can be started quickly, so that the purpose of starting the switching power supply quickly is achieved; meanwhile, when the power fails, the purpose of shortening the restarting of the power supply and reducing the input power consumption of the power failure can be achieved when the low voltage is input by 100V.

In this embodiment, the resistor R21 is further grounded through a capacitor C6 and a diode D7, and one end of the diode D7 is connected to the base of the transistor Q2.

In this embodiment, the charging capacitor EC1 is connected to the input end of the main control chip through a resistor R36.

In this embodiment, a power switching circuit is also included.

In this embodiment, the power switching circuit includes a main control unit U2, where the main control unit U2 is configured to send PWM1 signals and PWM2 signals;

In this embodiment, the output ends of the first switching module and the second switching module are both provided with constant voltage and constant current modules.

In this embodiment, the output end of the switching unit U1 is connected to an inductor L5 through a resistor R36, the inductor L5 is connected to a resistor R28, and a common junction between the inductor L5 and the resistor R28 is connected to the sampling end of the switching unit U1.

Switching working principle: after the main switch is started, the main control unit U2 detects that PWM1 signals are output to the switching unit U1 at the moment, the switching unit U1 outputs 10W power through constant voltage and constant current at the pins 5 and 6 according to the frequency of the PWM1, then the PWM2 signals are sent to the switching unit U1-1, the pins 5 and 6 of the switching unit U1-1 output 30W power, and the current output power is detected in real time through a SENN sampling signal.

The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the utility model, but rather is presented in the claims.

Claims

1. The quick starting circuit is characterized by comprising an input end, wherein the input end is connected with a base electrode of a triode Q2 through a resistor R24 and a resistor R21, the input end is connected with a collector electrode of the triode Q2 through a resistor R43 and a resistor R23, an emitter electrode of the triode Q2 is grounded through a charging capacitor EC1, and the charging capacitor EC1 is also connected with an input end of a main control chip.

2. The quick start circuit of claim 1, wherein: the resistor R21 is grounded through a capacitor C6 and a diode D7, and one end of the diode D7 is connected with the base electrode of the triode Q2.

3. The quick start circuit of claim 2, wherein: the charging capacitor EC1 is connected with the input end of the main control chip through a resistor R36.

4. The quick start circuit of claim 1, wherein: a power switching circuit is also included.

5. The quick start circuit of claim 4, wherein: the power switching circuit comprises a main control unit U2, wherein the main control unit U2 is used for sending PWM1 signals and PWM2 signals;

6. The quick start circuit of claim 5, wherein: and the output ends of the first switching module and the second switching module are respectively provided with a constant voltage and constant current module.

7. The quick start circuit of claim 6, wherein: the output end of the switching unit U1 is connected with an inductor L5 through a resistor R36, the inductor L5 is connected with a resistor R28, and a common joint between the inductor L5 and the resistor R28 is connected with the sampling end of the switching unit U1.