Voltage doubling rectifying circuit based on automatic detection of input voltage

Abstract

The invention relates to the technical field of power supply, in particular to a voltage doubling rectifying circuit based on automatic detection of input voltage, which comprises an inductor L1, a rectifier BD1, a relay RL1, a BUCK constant-voltage chip U1 and a control chip U2, the model of the BUCK constant-voltage chip U1 is BP2525D, the model of the controller U2 is NY8B062F, a pin 1 of the inductor L is connected with the input of a fuse F1, and the input end of the fuse F1 is connected with the input of a power supply L. According to the voltage doubling rectifying circuit based on the automatic detection of the input voltage, when AC110V alternating current is input, power is supplied to the controller U2 and the relay RL1 through the BUCK constant-voltage chip U1, and then the controller U2 controls the relay RL1 to be closed, so that rectification output voltage doubling is realized, and 220V alternating current is output; when the AC 220V alternating current is input, a 220V power supply is output through normal rectification and continues to supply power to a post-stage circuit, voltage gears do not need to be switched manually, and use is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a voltage doubling rectifier circuit based on automatic detection of input voltage. Background Art

[0002] Due to the inconsistency of AC voltage input in different countries / regions, there are differences between AC110V and AC220V. The input end of the switching power supply product realizes circuit conversion by manually switching different voltage gears with buttons, which is a bit mechanical and rigid, easy to operate incorrectly, and has safety hazards. Therefore, a voltage doubling rectifier circuit based on automatic detection of input voltage is proposed to be suitable for regions with different AC voltage inputs. Summary of the invention

[0003] A technical problem to be solved by the present application is that when the switching power supply is used in a wide voltage input range, it automatically switches to a voltage doubling rectification mode under AC110V and outputs 220V AC power without manual switching, which is easy to use.

[0004] In order to solve the above technical problems, the embodiment of the present application provides a voltage doubling rectifier circuit based on automatic detection of input voltage, including an inductor L1, a rectifier BD1, a relay RL1, a BUCK constant voltage chip U1 and a control chip U2, wherein the pin 1 of the inductor L is connected to the input of the fuse F1, the input end of the fuse F1 is connected to the input of the power supply L, the pin 2 of the inductor L is connected to the input end of the thermistor NTC1, and is connected to the input ends of the varistor RV1 and the capacitor CX1, and the input end of the varistor RV1 is connected to the input end of the capacitor CX1. The input of the inductor L1 is connected to the input of the diode D1 and to the pin 4 of the rectifier BD1. The input of the diode D1 is connected to the input of the resistor R1 and to the input of the capacitor CE5. The output of the capacitor CE5 is grounded. The output of the resistor R1 is connected to the input of the resistor R4 and the capacitor CE3. The output of the capacitor CE3 is grounded. The output of the resistor R4 is connected to the input of the resistor R9 and the resistor R5. The output of the resistor R5 is grounded. The output of the resistor R9 is connected to the input of the resistor R9 and the resistor R5. The 3rd pin of the inductor L1 is connected to the input end of the diode D2, and to the 2nd pin of the rectifier BD1 and the 2nd pin of the relay RL1. The output end of the diode D2 is connected to the output end of the diode D1 and then to the 4th and 5th pins of the BUCK constant voltage chip. The 3rd pin of the rectifier BD1 is connected in series with the capacitor CE1 and then to the 3rd pin of the relay RL1 and the input end of the capacitor CE2. The 1st pin of the relay RL1 is connected to the +5V power input. The 6th pin of the relay RL1 is connected to the input end of the resistor R7. The input end is connected in series with a diode D7 and then connected to a +5V input. The output end of the resistor R7 is connected to the collector of the transistor Q1. The base of the transistor Q1 is connected in series with a resistor R6 and then connected to pin 7 of the controller U2. The base is connected to the input end of the resistor R11. The output end of the resistor R11 is connected to the emitter of the transistor Q1 and then grounded. The capacitor C7 is connected in parallel between pins 1 and 3 of the BUCK constant voltage chip U1. Pins 1 and 2 of the BUCK constant voltage chip U1 are connected and then connected to the output end of the inductor L2, and are connected to the output end of the diode D5. The input end of the diode D5 is grounded, the 6th pin of the BUCK constant voltage chip U1 is connected in series with the resistor R2 and then connected to the output end of the inductor L2, the input end of the inductor L2 is connected to the +5V input, and is connected to the input ends of the diode D4, the resistor R3, the capacitor CE4 and the resistor R10, the diode D4 is connected to the 3rd pin of the BUCK constant voltage chip U1, and the output ends of the resistor R3, the capacitor CE4 and the resistor R10 are connected and then grounded; the 1st pin of the controller U2 is connected in series with the resistor R8 and then connected to the +5V input, and the two ends of the resistor R8 are connected in parallel with the diode D8.

[0005] As a further solution of the present invention, the model of the BUCK constant voltage chip U1 is BP2525D.

[0006] As a further solution of the present invention, the model of the controller U2 is NY8B062F.

[0007] As a further solution of the present invention, pin 5 of the controller U2 is connected to the input end of capacitor CE6 and the voltage zener diode D3, the output end of capacitor CE6 is grounded, and the output end of the voltage zener diode D3 is grounded.

[0008] The present invention has at least the following beneficial effects: this voltage doubling rectifier circuit based on automatic detection of input voltage, when AC110V alternating current is input, can power the controller U2 and the relay RL1 through the BUCK constant voltage chip U1, and then the controller U2 controls the relay RL1 to attract and output 220V alternating current; when AC220V alternating current is input, the controller U2 detects the AC input voltage, and if it does not meet the detection conditions, the relay RL1 is normally open, the voltage is not doubled, and the normal rectification output is 220V power supply, which continues to power the subsequent circuit, without the need to manually switch the voltage gear, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The schematic diagram of the circuit of the present invention is shown in FIG. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. See also Figure 1The present invention provides a technical solution: a voltage doubling rectifier circuit based on automatic input voltage detection, comprising an inductor L1, a rectifier BD1, a relay RL1, a BUCK constant voltage chip U1 and a control chip U2, the model of the BUCK constant voltage chip U1 is BP2525D, the model of the controller U2 is NY8B062F, the No. 1 pin of the inductor L is connected to the input of the fuse F1, the input end of the fuse F1 is connected to the input of the power supply L, the No. 2 pin of the inductor L is connected to the input end of the thermistor NTC1, and is connected to the input ends of the varistor RV1 and the capacitor CX1, the input end of the varistor RV1 is connected in parallel with the input end of the capacitor CX1 and then connected to the input end of the fuse F1; the No. 4 pin of the inductor L1 is connected to the input end of the diode D1 The input end is connected to pin 4 of rectifier BD1, the input end of diode D1 is connected to the input end of resistor R1, and is connected to the input end of capacitor CE5, the output end of capacitor CE5 is grounded, the output end of resistor R1 is connected to resistor R4 and the input end of capacitor CE3, the output end of capacitor CE3 is grounded, the output end of resistor R4 is connected to the input end of resistor R9 and resistor R5, the output end of resistor R5 is grounded, the output end of resistor R9 is connected to pin 5 of controller U2, pin 5 of controller U2 is connected to capacitor CE6 and the input end of Zener diode D3, the output end of capacitor CE6 is grounded, and the output end of Zener diode D3 is grounded; pin 3 of inductor L1 is connected to the input end of diode D2, and is connected to rectifier B Pin 2 of D1 and pin 2 of relay RL1, the output end of diode D2 is connected to the output end of diode D1 and then connected to pins 4 and 5 of BUCK constant voltage chip; Pin 3 of rectifier BD1 is connected in series with capacitor CE1 and then connected to pin 3 of relay RL1 and the input end of capacitor CE2, pin 1 of relay RL1 is connected to +5V power input, pin 6 of relay RL1 is connected to the input end of resistor R7, and is connected in series with diode D7 and then connected to +5V input, the output end of resistor R7 is connected to the collector of transistor Q1, the base of transistor Q1 is connected in series with resistor R6 and then connected to pin 7 of controller U2, and the base is connected to the input end of resistor R11, the output end of resistor R11 is connected to the emitter of transistor Q1 and then grounded; BUCK Capacitor C7 is connected in parallel between pin 1 and pin 3 of the constant voltage chip U1, pin 1 and pin 2 of the BUCK constant voltage chip U1 are connected and then connected to the output end of the inductor L2, and connected to the output end of the diode D5, the input end of the diode D5 is grounded, pin 6 of the BUCK constant voltage chip U1 is connected in series with resistor R2 and then connected to the output end of the inductor L2, the input end of the inductor L2 is connected to the +5V input, and connected to the input ends of the diode D4, resistor R3, capacitor CE4 and resistor R10, diode D4 is connected to pin 3 of the BUCK constant voltage chip U1, the output ends of the resistor R3, capacitor CE4 and resistor R10 are connected and then grounded; pin 1 of the controller U2 is connected in series with resistor R8 and then connected to the +5V input, and diode D8 is connected in parallel at both ends of the resistor R8.

[0011] This voltage doubler rectifier circuit is based on automatic input voltage detection. It can be directly turned on and used when AC power is input. Its principle is as follows: Working principle: When AC110V is input, the controller U2 and relay RL1 are powered through the BUCK constant voltage chip U1, and then the controller U2 controls the relay RL1 to pull in, realizing the circuit function of rectifying and outputting double voltage (voltage across the large capacitor), supplying power to the subsequent circuit and outputting 220V AC power; when AC220V is input, the controller U2 detects the AC input voltage, and if it does not meet the detection conditions, the relay RL1 is normally open, the voltage is not doubled, and the normal rectification output is 220V power to continue to supply power to the subsequent circuit.

[0012] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0013] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage doubling rectifier circuit based on automatic input voltage detection, comprising an inductor L1, a rectifier BD1, a relay RL1, a BUCK constant voltage chip U1 and a control chip U2, characterized in that: Pin 1 of the inductor L is connected to the input of the fuse F1, the input end of the fuse F1 is connected to the input of the power supply L, pin 2 of the inductor L is connected to the input end of the thermistor NTC1, and is connected to the input ends of the varistor RV1 and the capacitor CX1, the input end of the varistor RV1 is connected in parallel with the input end of the capacitor CX1 and then connected to the input end of the fuse F1; pin 4 of the inductor L1 is connected to the input end of the diode D1, and is connected to pin 4 of the rectifier BD1, the input end of the diode D1 is connected to the input end of the resistor R1, and is connected to the input end of the capacitor CE5, the output end of the capacitor CE5 is grounded, and the input end of the resistor R1 is grounded. The output end of the inductor L1 is connected to the input end of the resistor R4 and the input end of the capacitor CE3, the output end of the capacitor CE3 is grounded, the output end of the resistor R4 is connected to the input end of the resistor R9 and the input end of the resistor R5, the output end of the resistor R5 is grounded, and the output end of the resistor R9 is connected to the No. 5 pin of the controller U2; the No. 3 pin of the inductor L1 is connected to the input end of the diode D2, and to the No. 2 pin of the rectifier BD1 and the No. 2 pin of the relay RL1, the output end of the diode D2 is connected to the output end of the diode D1 and then connected to the No. 4 and No. 5 pins of the BUCK constant voltage chip; the No. 3 pin of the rectifier BD1 is connected in series with the capacitor CE1 and then connected to the relay RL 1 and the input end of the capacitor CE2, the 1st pin of the relay RL1 is connected to the +5V power input, the 6th pin of the relay RL1 is connected to the input end of the resistor R7, and the diode D7 is connected in series and then connected to the +5V input, the output end of the resistor R7 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected in series with the resistor R6 and then connected to the 7th pin of the controller U2, and the base is connected to the input end of the resistor R11, the output end of the resistor R11 is connected to the emitter of the transistor Q1 and then grounded; the capacitor C7 is connected in parallel between the 1st pin and the 3rd pin of the BUCK constant voltage chip U1, the 1st pin of the BUCK constant voltage chip U1 and the 2nd pin The pins are connected to the output end of the inductor L2 and to the output end of the diode D5. The input end of the diode D5 is grounded. The 6th pin of the BUCK constant voltage chip U1 is connected in series with the resistor R2 and then connected to the output end of the inductor L2. The input end of the inductor L2 is connected to the +5V input and connected to the input ends of the diode D4, the resistor R3, the capacitor CE4 and the resistor R10. The diode D4 is connected to the 3rd pin of the BUCK constant voltage chip U1. The output ends of the resistor R3, the capacitor CE4 and the resistor R10 are connected and then grounded; the 1st pin of the controller U2 is connected in series with the resistor R8 and then connected to the +5V input, and the two ends of the resistor R8 are connected in parallel with the diode D8.

2. The voltage doubling rectifier circuit based on automatic input voltage detection according to claim 1, characterized in that: The model of the BUCK constant voltage chip U1 is BP2525D.

3. The voltage doubling rectifier circuit based on automatic input voltage detection according to claim 2, characterized in that: The model of the controller U2 is NY8B062F.

4. The voltage doubling rectifier circuit based on automatic input voltage detection according to claim 3, characterized in that: Pin 5 of the controller U2 is connected to the input end of the capacitor CE6 and the voltage-stabilizing diode D3 , the output end of the capacitor CE6 is grounded, and the output end of the voltage-stabilizing diode D3 is grounded.

Images