Output voltage self-adaptive detection circuit for different loads

Abstract

The utility model relates to the technical field of switching power supplies, in particular to an output voltage self-adaptive detection circuit for different loads, which comprises a main control circuit, an operational amplifier circuit, a first power supply circuit, a second power supply circuit and a third power supply circuit, the main control circuit adopts a chip U3 as a control chip, and the model of the chip U3 is NY8B062F. According to the different-load adaptive output voltage detection circuit, after the switching power supply is connected with the commercial power, a default initial voltage (such as 12VDC) is generated at the normal output end of the power supply; the chip U3 is used for detecting the voltage value of the output end of the operational amplifier U1 and the voltage value of the output end of the switching power supply subjected to resistor voltage division, and the REF pin of the chip U3 is used for changing the resistance value to realize switching of different output voltage gears, so that the whole device is more intelligent, efficient and convenient, and the possibility of manual misoperation is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of switching power supply, specifically to a different load adaptive detection output voltage circuit. BACKGROUND

[0002] Due to different output voltage requirements of switching power supply products for different application scenarios, the power output end switches different voltage gears through manual key to realize voltage conversion, which is slightly mechanical, rigid and easy to misoperate, and has safety hazards, so a different load adaptive detection output voltage circuit is proposed. SUMMARY

[0003] One technical problem to be solved by the present application is that voltage conversion is realized by switching different voltage gears through manual key, which is slightly mechanical, rigid and easy to misoperate, and has safety hazards.

[0004] To solve the above technical problems, the present application provides a different load adaptive detection output voltage circuit, which comprises a main control circuit, an operational amplifier circuit, a first power supply circuit, a second power supply circuit and a third power supply circuit, the main control circuit adopts chip U3 as a control chip, the model of chip U3 is NY8B062F, the No. 5 pin of chip U3 is connected with the input end of capacitor C4 and diode D2, the output end of capacitor C4 and diode D2 is grounded, the output end of the operational amplifier circuit is connected with the No. 5 pin of chip U3, the output end of the first power supply circuit is connected with the No. 4 pin of chip U3, the second power supply circuit is connected with the No. 7 pin of chip U3, and the third power supply circuit is connected with the No. 1 pin of chip U3.

[0005] Preferably, the operational amplifier circuit comprises resistors R1-R6, an operational amplifier U1 and a capacitor C1, the No. 1 pin of operational amplifier U1 is connected with the ground through resistors R4 and R5 in sequence, resistors R6 are connected in parallel between the No. 1 pin and the No. 4 pin of operational amplifier U1, resistor R1 is connected in series to the No. 3 pin of operational amplifier U1, resistors R2 are connected in parallel between the No. 3 pin and the No. 4 pin of operational amplifier U1, resistor R3 is connected in series to the No. 5 pin of operational amplifier U1, the output end of capacitor C1 is connected to the input end of +5V power supply input, and the output end of capacitor C1 is grounded; the No. 4 pin of operational amplifier U1 is connected to the No. 5 pin of chip U3.

[0006] Preferably, the first power supply circuit comprises a row pin J1, resistors R9-R11 and a triode Q1, the collector of triode Q1 is connected with resistor R9, and then connected to the No. 2 pin of row pin J1, the base of triode Q1 is connected to the input end of resistor R10, and also connected to the input end of resistor R11, the output end of resistor R11 is connected with the emitter of triode Q1, and then grounded, and the output end of resistor R10 is connected to the No. 6 pin of chip U3.

[0007] Preferably, the second power supply circuit comprises resistance R12-resistance R14, capacitor C5 and diode D4, the input end of resistance R14 is connected with V0+ power supply end input, the output end of resistance R14 is connected with the input end of resistance R12 and the input end of resistance R13, the output end of resistance R12 is grounded, the output end of resistance R13 is connected with the 7th pin of chip U3 and is connected with the input end of capacitor C5 and the input end of diode D4, the output end of capacitor C5 is grounded, and the output end of diode D4 is grounded.

[0008] Preferably, the third power supply circuit comprises chip U2, resistance R7, resistance R5, diode D1, capacitor C2 and capacitor C3, the 2nd pin of chip U2 is connected with V0+ input after being connected with resistance R7 in series and is connected with the output end of diode D1 and the input end of capacitor C3, the input end of diode D1 is connected with the input end of resistance R7, and the output end of capacitor C3 is grounded; the 3rd pin of chip U2 is connected with the 1st pin of chip U3 after being connected with resistance R8 in series, and the 3rd pin of chip U2 is connected with the input end of resistance R3.

[0009] The utility model at least has the following beneficial effects: this different load adaptive detection output voltage circuit default V0+ end input 12V power supply, switch power supply connects the mains after, power supply normal output end has default initial voltage generation (such as 12VDC), utilize chip U3 to detect operational amplifier U1's output end voltage value and switch power supply output end through resistance voltage value after dividing and the voltage value that change resistance value size through the REF pin of chip U3 realize the switching of different output voltage gear, the whole is more intelligent, efficient and convenient, reduce the possibility of manual misoperation. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the circuit principle drawing of the utility model;

[0011] Figure 2 It is the work flow chart of the utility model. DETAILED DESCRIPTION

[0012] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model

[0013] Please refer to Figure 1The utility model provides a technical scheme: a different load adaptive detection output voltage circuit, including main control circuit, operational amplifier circuit, first power supply circuit, second power supply circuit and third power supply circuit, the main control circuit adopts chip U3 as control chip, the model of chip U3 is NY8B062F, the 5th pin of chip U3 is connected to the input end of capacitor C4 and diode D2, the output end of capacitor C4 and diode D2 is grounded, the output end of operational amplifier circuit is connected with the 5th pin of chip U3, the output end of first power supply circuit is connected with the 4th pin of chip U3, second power supply circuit is connected with the 7th pin of chip U3, third power supply circuit is connected with the 1st pin of chip U3.

[0014] Among them: operational amplifier circuit includes resistance R1-resistance R6, operational amplifier U1 and capacitor C1, the 1st pin of operational amplifier U1 is connected to the ground after resistance R4 and resistance R5 are connected in series, resistance R6 is connected between the 1st pin and the 4th pin of operational amplifier U1, resistance R1 is connected in series to the 3rd pin of operational amplifier U1, then the ground, resistance R2 is connected between the 3rd pin and the 4th pin of operational amplifier U1, resistance R3 is connected in series to the 5th pin of operational amplifier U1, then the +5V power supply input, and is connected to the input end of capacitor C1, the output end of capacitor C1 is grounded, the 4th pin of operational amplifier U1 is connected to the 5th pin of chip U3.

[0015] Among them: first power supply circuit includes row pin J1, resistance R9-resistance R11 and triode Q1, triode Q1's collector is connected to the 2nd pin of row pin J1 after resistance R9 is connected in series, the base of triode Q1 is connected to the input end of resistance R10, and is connected to the input end of resistance R11, the output end of resistance R11 is connected to the emitter of triode Q1 after the ground, the output end of resistance R10 is connected to the 6th pin of chip U3.

[0016] Among them: second power supply circuit includes resistance R12-resistance R14, capacitor C5 and diode D4, the input end of resistance R14 is connected to the input of V0+ power supply end, the output end of resistance R14 is connected to the input end of resistance R12 and the input end of resistance R13, the output end of resistance R12 is grounded, the output end of resistance R13 is connected to the 7th pin of chip U3, and is connected to the input end of capacitor C5 and the input end of diode D4, the output end of capacitor C5 is grounded, the output end of diode D4 is grounded.

[0017] Among them: third power supply circuit includes chip U2, resistance R7, resistance R5, diode D1, capacitor C2 and capacitor C3, the 2nd pin of chip U2 is connected to V0+ input after resistance R7 is connected in series, and is connected to the output end of diode D1 and the input end of capacitor C3, the input end of diode D1 is connected to the input end of resistance R7, the output end of capacitor C3 is grounded, the 3rd pin of chip U2 is connected to the 1st pin of chip U3 after resistance R8 is connected in series, and is connected to the input end of resistance R3.

[0018] Please refer to Figure 2 , the different load adaptive detection output voltage circuit in the starting state, chip U3 default output low level, namely V0+ end default input 12V power supply, at this time 12V LED, at this time ADC2 end input 0.25V power supply, determine whether the input power of ADC1 end is greater than 0.5V, when the determination structure is greater than 0.5V, at this time chip U3 output low level, V0+ end keeps input 12V power supply; When the default input power of chip U3 is not low level, at this time the default V0+ end input 12V power supply, connect 24V LED, at this time ADC2 end input 0.25V power supply, determine whether the input power of ADC1 end is less than 0.5V, when the determination result is true, chip U3 controls output high level, that is, V0=24V, at this time set ADC2 end input 0.5V power supply, determine whether the input power of ADC1 end is greater than 0.5V, when the determination result is true, at this time chip U3 controls to keep the last state, that is, high level; When the determination result is false, set ADC2 end input 0.5V power supply, determine whether the input power of ADC1 end is less than 0.5V, when the determination result is true, chip U3 outputs low level, at this time the default V0+ end input 12V power supply.

[0019] The different load adaptive detection output voltage circuit defaults V0+ end input 12V power supply, after the switch power supply is connected to the mains, the default initial voltage is generated at the normal output end of the power supply (such as 12VDC), the chip U3 is used to detect the output voltage value of the operational amplifier U1 and the voltage value after the voltage of the output end of the switch power supply is divided by resistors, and the size of the resistance value is changed through the REF pin of the chip U3 to realize the switching of different output voltage grades.

[0020] It should be noted that, in the present document, relational terms such as first and second and the like can be 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. Moreover, the terms "comprises", "comprising", or any other variations 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 can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0021] Although the embodiments of the present application have been shown and described, it should be understood by those ordinary skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A different load adaptive detection output voltage circuit comprising a master control circuit, an operational amplifier circuit, a first power supply circuit, a second power supply circuit and a third power supply circuit, characterized in that: The main control circuit adopts chip U3 as the control chip, the model of chip U3 is NY8B062F, the No.5 pin of chip U3 is connected with the input end of capacitor C4 and diode D2, the output end of capacitor C4 and diode D2 is grounded, the output end of the operational amplifier circuit is connected with the No.5 pin of chip U3, the output end of the first power supply circuit is connected with the No.4 pin of chip U3, the second power supply circuit is connected with the No.7 pin of chip U3, and the third power supply circuit is connected with the No.1 pin of chip U3.

2. The varying load self-adapting detection output voltage circuit of claim 1, wherein: The operational amplifier circuit comprises resistors R1-R6, an operational amplifier U1 and a capacitor C1, the No.1 pin of operational amplifier U1 is connected with resistor R4 and resistor R5 in sequence and then grounded, the No.1 pin and the No.4 pin of operational amplifier U1 are connected with resistor R6 in parallel, the No.3 pin of operational amplifier U1 is connected with resistor R1 and then grounded, the No.3 pin and the No.4 pin of operational amplifier U1 are connected with resistor R2 in parallel, the No.5 pin of operational amplifier U1 is connected with resistor R3 and then +5V power supply input, and is connected to the input end of capacitor C1, and the output end of capacitor C1 is grounded; the No.4 pin of operational amplifier U1 is connected to the No.5 pin of chip U3.

3. The varying load self-adapting detection output voltage circuit of claim 1, wherein: The first power supply circuit comprises a row pin J1, resistors R9-R11 and a triode Q1, the collector of triode Q1 is connected with resistor R9 and then to the No.2 pin of row pin J1, the base of triode Q1 is connected to the input end of resistor R10 and the input end of resistor R11, the output end of resistor R11 is connected with the emitter of triode Q1 and then grounded, and the output end of resistor R10 is connected to the No.6 pin of chip U3.

4. The varying load self-adapting detection output voltage circuit of claim 1, wherein: The second power supply circuit comprises resistors R12-R14, a capacitor C5 and a diode D4, the input end of resistor R14 is connected with V0+ power supply end input, the output end of resistor R14 is connected to the input end of resistor R12 and the input end of resistor R13, the output end of resistor R12 is grounded, the output end of resistor R13 is connected to the No.7 pin of chip U3 and to the input end of capacitor C5 and the input end of diode D4, the output end of capacitor C5 is grounded, and the output end of diode D4 is grounded.

5. The varying load self-adapting detection output voltage circuit of claim 1, wherein: The third power supply circuit comprises chip U2, resistor R7, resistor R5, diode D1, capacitor C2 and capacitor C3, the No.2 pin of chip U2 is connected with resistor R7 and then V0+ input, and is connected to the output end of diode D1 and the input end of capacitor C3, the input end of diode D1 is connected to the input end of resistor R7, and the output end of capacitor C3 is grounded; the No.3 pin of chip U2 is connected with resistor R8 and then to the No.1 pin of chip U3, and the No.3 pin of chip U2 is connected with the input end of resistor R3.

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