An adjustable output voltage boosting device

Abstract

The application discloses a kind of adjustable output's voltage boosting device, including power supply boosting part, chip power supply part, input adjustment part, output adjustment part;The power supply boosting part includes input terminal J1, one end of the input terminal J1 is connected with the positive pole of external power supply, the other end of the input terminal J1 is connected with the negative pole of the external power supply, and the 1 pin of the input terminal J1 is connected with ground.The application is by adjusting the adjustable resistance of power supply boosting part, and the variation of voltage or current is fed back to output adjustment part, and the duty cycle of output pulse is adjusted according to feedback signal of the chip of output adjustment part, so as to change the output voltage of boosting part.In the same range of wide input voltage, different output voltages can be adjusted for different load use scenarios, and the output voltage stable amplitude is adjustable, has overcurrent protection function, so that the safety of power supply is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, in particular to a boost device with adjustable output. BACKGROUND

[0002] The output range of the commonly used boost device is basically fixed at a specific value, which cannot be adjusted with the change of the use environment. The existing boost device can provide a limited boost range, which has a large limitation on the input and output, and the output voltage is unstable and the amplitude is not adjustable. For example, 5V to 12V, 12V to 48, etc. LDO circuit can only be used in specific environment, and for different demand scenarios, targeted redesign is needed, which not only wastes cost, but also consumes redesign time.

[0003] At present, there is no effective solution to the above problems. SUMMARY

[0004] In view of the above technical problems in the related art, the present application provides a boost device with adjustable output, which can change the duty cycle of the pulse controlling the field effect tube by adjusting the external adjustable resistor, so as to change the output voltage value of the boost device, and overcome the above shortcomings of the prior art.

[0005] To achieve the above technical purposes, the technical scheme of the present application is as follows:

[0006] A boost device with adjustable output, comprising a power supply boost part, a chip power supply part, an input adjustment part and an output adjustment part.

[0007] The power supply boost part comprises an input terminal J1, one end of the input terminal J1 is connected with the positive electrode of an external power supply, the other end of the input terminal J1 is connected with the negative electrode of the external power supply, the 1 pin of the input terminal J1 is connected with the ground, the 2 pin of the input terminal J1 is connected with one end of a fuse FU1, the other end of the fuse FU1 is connected with one end of a filter capacitor C4, C9, one end of an energy storage inductor L1 and the positive electrode of a rectifier diode D7 respectively, the other end of the filter capacitor C4, C9 is connected with the ground respectively, the other end of the energy storage inductor L1 is connected with the positive electrode of a Schottky diode D1 and the drain of a field effect tube Q1 respectively, the negative electrode of the Schottky diode D1 is connected with one end of a capacitor C7, C8, C13, the 1 pin of an output terminal J2 and the 3 pin of an adjustable resistor RP1 of the output adjustment part respectively, the other end of the capacitor C7, C8, C13 and the 2 pin of the output terminal J2 are connected with the ground respectively, the gate of the field effect tube Q1 is connected with one end of a resistor R1.

[0008] The output adjusting part includes PWM controller U1, the 1 pin of the PWM controller U1 is connected with the capacitor C2 and the one end of the resistor R4 respectively; the 2 pin of the PWM controller U1 is connected with the other end of the capacitor C2, the other end of the resistor R4, the one end of the resistor R13 and the one end of R15 respectively, the other end of the resistor R13 is connected with the ground, the other end of the R15 is connected with the 1 pin and 2 pin of the adjustable resistor RP1; the 4 pin of the PWM controller U1 is connected with the one end of the capacitor C1 and the one end of the resistor R11 respectively, the other end of the resistor R11 is connected with the one end of the capacitor C3 and the 8 pin of the PWM controller U1 respectively, the other end of the capacitor C1 and the other end of the capacitor C3 are both connected with the ground; the 5 pin of the PWM controller U1 is connected with the ground; the 6 pin of the PWM controller U1 is connected with the other end of the R1 of the power supply boosting part.

[0009] Further, the input adjusting part includes operational amplifier U2, the 1 pin of the operational amplifier U2 is connected with the 1 pin and 2 pin of the adjustable resistor RP3 and the one end of the resistor R33; the 2 pin of the operational amplifier U2 is connected with the one end of the resistor R7 and R8, the other end of the resistor R7 is connected with the 3 pin of the adjustable resistor RP3, the other end of the resistor R8 is connected with the ground; the 3 pin of the operational amplifier U2 is connected with the one end of the sampling resistor R14; the 5 pin of the operational amplifier U2 is connected with the one end of the resistor R9 and the one end of the resistor R12 respectively, the other end of the resistor R12 and the 4 pin of the operational amplifier U2 are both connected with the ground; the 7 pin of the operational amplifier U2 is connected with the one end of the resistor R32, the other end of the resistor R32 is connected with the positive electrode of the light emitting diode D5; the 8 pin of the operational amplifier U2 is connected with the one end of the capacitor C21, the other end of the capacitor C21 is connected with the ground.

[0010] Further, the other end of the input adjusting part R33 and the negative electrode of the light emitting diode D5 are both connected with the 3 pin of the PWM controller U1.

[0011] Further, the other end of the sampling resistor R14 is connected with the one end of the sampling resistor R6 and R31 and the source electrode of the field effect transistor Q1 of the power supply boosting part respectively, the other end of the sampling resistor R6 and R31 is connected with the ground.

[0012] Further, the pin 6 of the operational amplifier U2 is connected with one end of the resistor R10 and pin 2 of the adjustable resistor RP2, the other end of the resistor R10 is connected with one end of the resistor R22, the emitter of the Darlington transistor T1, pin 3 of the terminal J4 and the negative pole of the rectifier diode D7, pin 3 of the adjustable resistor RP2 is connected with the ground, the other end of the resistor R22 is connected with the base of the Darlington transistor T1, the negative pole of the rectifier diode D4 and the negative pole of the voltage stabilizing diode D6 respectively, the collector of the Darlington transistor T1 and the positive pole of the rectifier diode D4 are connected with pin 1 of the terminal J4, the positive pole of the voltage stabilizing diode D6 is connected with the ground.

[0013] Further, the chip power supply part comprises a DC voltage reduction chip U5, pin 1 of the DC voltage reduction chip U5 is connected with pin 2 of the terminal J4 of the input adjusting part, one end of the filter capacitor C6 and one end of C11 respectively, pin 2 of the DC voltage reduction chip U5 is connected with the negative pole of the diode D2 and one end of the inductor L2 respectively, the other end of the inductor L2 is connected with one end of the capacitor C20, C10, C12, one end of the resistor R2 and the other end of the resistor R9 of the input adjusting part, pin 8 of the operational amplifier U2 and pin 7 of the PWM controller U1 of the output adjusting part respectively, the other end of the filter capacitor C6, the other end of C11, the positive pole of the diode D2, the other end of the capacitor C10 and the other end of the capacitor C20 are all connected with the ground, pin 3 of the DC voltage reduction chip U5 is connected with the other end of the capacitor C12, the other end of the resistor R2 and one end of the resistor R3 respectively, pin 4, 5, 6, 7 and 8 of the DC voltage reduction chip U5 and the other end of the resistor R3 are all connected with the ground.

[0014] The application has the following beneficial effects: the application can feed back the voltage or current variation to the output adjusting part through the adjustable resistor of the power supply voltage boosting part, the chip of the output adjusting part can adjust the duty cycle of the output pulse according to the feedback signal, so as to change the output voltage of the voltage boosting part, the application can adjust different output voltages for different use scenarios of different loads within the same range of wide input voltage, the output voltage has a stable adjustable amplitude, has the overcurrent protection function, and the safety of the power supply is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0016] Figure 1This is a schematic diagram of the overall structure of the adjustable output boost device according to an embodiment of the present invention;

[0017] Figure 2 This is a system diagram of an adjustable output boost device according to an embodiment of the present invention;

[0018] Figure 3 It is the power boost section of the adjustable output boost device according to an embodiment of the present invention;

[0019] Figure 4 This is a circuit diagram of the power supply section of the adjustable output boost device according to an embodiment of the present invention;

[0020] Figure 5 This is a circuit diagram of the input adjustment section of the adjustable output boost device according to an embodiment of the present invention;

[0021] Figure 6 This is a circuit diagram of the output adjustment section of the adjustable output boost device according to an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0023] like Figures 1-6 As shown, an adjustable output boost device according to an embodiment of the present invention includes a power boost section, a chip power supply section, an input adjustment section, and an output adjustment section.

[0024] The power boost section includes an input terminal J1. One end of the input terminal J1 is connected to the positive terminal of the external power supply, and the other end of the input terminal J1 is connected to the negative terminal of the external power supply. Pin 1 of the input terminal J1 is connected to ground. Pin 2 of the input terminal J1 is connected to one end of a fuse FU1. The other end of the fuse FU1 is connected to one end of filter capacitors C4 and C9, one end of energy storage inductor L1, and the positive terminal of rectifier diode D7. The other ends of filter capacitors C4 and C9 are both connected to ground. The other end of energy storage inductor L1 is connected to the positive terminal of Schottky diode D1 and the drain of field-effect transistor Q1. The negative terminal of Schottky diode D1 is connected to one end of capacitors C7, C8, and C13, pin 1 of output terminal J2, and pin 3 of adjustable resistor RP1 in the output adjustment section. The other ends of capacitors C7, C8, and C13 and pin 2 of output terminal J2 are both connected to ground. The gate of field-effect transistor Q1 is connected to one end of resistor R1.

[0025] The output adjusting part includes PWM controller U1, the 1 pin of the PWM controller U1 is connected with the capacitor C2 and the one end of the resistor R4 respectively; the 2 pin of the PWM controller U1 is connected with the other end of the capacitor C2, the other end of the resistor R4, the one end of the resistor R13 and the one end of R15 respectively, the other end of the resistor R13 is connected with the ground, the other end of the R15 is connected with the 1 pin and 2 pin of the adjustable resistor RP1; the 4 pin of the PWM controller U1 is connected with the one end of the capacitor C1 and the one end of the resistor R11 respectively, the other end of the resistor R11 is connected with the one end of the capacitor C3 and the 8 pin of the PWM controller U1 respectively, the other end of the capacitor C1 and the other end of the capacitor C3 are both connected with the ground; the 5 pin of the PWM controller U1 is connected with the ground; the 6 pin of the PWM controller U1 is connected with the other end of the R1 of the power supply boosting part.

[0026] Further, the input adjusting part includes operational amplifier U2, the 1 pin of the operational amplifier U2 is connected with the 1 pin and 2 pin of the adjustable resistor RP3 and the one end of the resistor R33; the 2 pin of the operational amplifier U2 is connected with the one end of the resistor R7 and R8, the other end of the resistor R7 is connected with the 3 pin of the adjustable resistor RP3, the other end of the resistor R8 is connected with the ground; the 3 pin of the operational amplifier U2 is connected with the one end of the sampling resistor R14; the 5 pin of the operational amplifier U2 is connected with the one end of the resistor R9 and the one end of the resistor R12 respectively, the other end of the resistor R12 and the 4 pin of the operational amplifier U2 are both connected with the ground; the 7 pin of the operational amplifier U2 is connected with the one end of the resistor R32, the other end of the resistor R32 is connected with the anode of the light emitting diode D5; the 8 pin of the operational amplifier U2 is connected with the one end of the capacitor C21, the other end of the capacitor C21 is connected with the ground.

[0027] Further, the other end of the input adjusting part R33 and the cathode of the light emitting diode D5 are both connected with the 3 pin of the PWM controller U1.

[0028] Further, the other end of the sampling resistor R14 is connected with the one end of the sampling resistor R6 and R31 and the source of the field effect transistor Q1 of the power supply boosting part respectively, the other end of the sampling resistor R6 and R31 is connected with the ground.

[0029] Further, the pin 6 of the operational amplifier U2 is connected with one end of the resistor R10 and pin 2 of the adjustable resistor RP2, the other end of the resistor R10 is connected with one end of the resistor R22, the emitter of the Darlington transistor T1, pin 3 of the terminal J4 and the negative pole of the rectifier diode D7, pin 3 of the adjustable resistor RP2 is connected with the ground, the other end of the resistor R22 is connected with the base of the Darlington transistor T1, the negative pole of the rectifier diode D4 and the negative pole of the voltage stabilizing diode D6 respectively, the collector of the Darlington transistor T1 and the positive pole of the rectifier diode D4 are connected with pin 1 of the terminal J4, the positive pole of the voltage stabilizing diode D6 is connected with the ground.

[0030] Further, the chip power supply part comprises a DC voltage reduction chip U5, pin 1 of the DC voltage reduction chip U5 is connected with pin 2 of the terminal J4 of the input adjusting part, one end of the filter capacitor C6 and one end of C11 respectively, pin 2 of the DC voltage reduction chip U5 is connected with the negative pole of the diode D2 and one end of the inductor L2 respectively, the other end of the inductor L2 is connected with one end of the capacitor C20, C10, C12, one end of the resistor R2 and the other end of the resistor R9 of the input adjusting part, pin 8 of the operational amplifier U2 and pin 7 of the PWM controller U1 of the output adjusting part respectively, the other end of the filter capacitor C6, the other end of C11, the positive pole of the diode D2, the other end of the capacitor C10 and the other end of the capacitor C20 are connected with the ground respectively, pin 3 of the DC voltage reduction chip U5 is connected with the other end of the capacitor C12, the other end of the resistor R2 and one end of the resistor R3 respectively, pin 4, 5, 6, 7 and 8 of the DC voltage reduction chip U5 and the other end of the resistor R3 are connected with the ground.

[0031] In order to facilitate the understanding of the above technical solutions of the present application, the above technical solutions of the present application are described in detail below through specific use modes.

[0032] In specific use, according to the adjustable output voltage boosting device, it comprises a power boosting part, a chip power supply part, an input adjusting part and an output adjusting part, the power boosting part is connected with the chip power supply part, used for converting the power output of the chip on the module, the output adjusting part is connected with the input adjusting part and the boosting part, when the adjustable resistor on the module is adjusted, the input adjusting part will feedback the voltage or current change to the output adjusting part, the chip of the output adjusting part adjusts the duty cycle of the output pulse according to the feedback signal, so as to change the output voltage of the boosting part.

[0033] The power boosting part includes input terminal, fuse, filter capacitor, energy storage inductor. One end of the input terminal J1 is connected to the positive pole of external power supply, and the other end is connected to the negative pole of external power supply; one end of the fuse FU1 is connected to the positive pole of the input terminal J1, and the other end is connected to one end of the filter capacitor C4, C9, one end of the energy storage inductor L1 and the positive pole of the rectifier diode D7; the negative pole of the rectifier diode D7 is connected to the 3-pin of the input regulating terminal J4; the other end of the filter capacitor C4, C9 is connected to the ground; the other end of the energy storage inductor L1 is connected to the positive pole of the Schottky diode D1 and the drain of the field effect transistor Q1; the negative pole of the Schottky diode D1 is connected to one end of the capacitor C7, C8, C13 and the positive pole of the output terminal J2; the other end of the capacitor C7, C8, C13 and the negative pole of the output terminal J2 are connected to the ground.

[0034] The chip power supply part includes filter capacitor, fast recovery diode, energy storage inductor, filter capacitor, voltage dividing resistor and DC voltage reduction chip. The 1-pin of the DC voltage reduction chip U5 is connected to the 2-pin of the input regulating terminal J4 and one end of the filter capacitor C6, C11; the 2-pin of the chip U5 is connected to the negative pole of the diode D2 and one end of the inductor L2, and the positive pole of the diode D2 is connected to the ground; the other end of the inductor L2 is connected to the capacitor C20, C10, C12 and one end of the resistor R2; the other end of the capacitor C10, C20 is connected to the ground; the 3-pin of the chip U5 is connected to the capacitor C12, the other end of the resistor R2 and one end of the resistor R3; the other end of the resistor R3 is connected to the ground; the 4-pin, 5-pin, 6-pin, 7-pin and 8-pin of the chip U5 are connected to the ground.

[0035] The input regulating part includes Darlington tube, operational amplifier, adjustable resistance, etc. The source of the field effect tube Q1 is connected with the sampling resistance R6, R31 and one end of R14, the other end of R6, R31 is connected with the ground; the grid of the field effect tube Q1 is connected with R1, the other end of R1 is connected with the 6th pin of the PWM controller U1; the 1st pin of the operational amplifier U2 is connected with the 1st pin, 2nd pin of the adjustable resistance RP3 and one end of R33; the 2nd pin of the operational amplifier U2 is connected with one end of R7, R8; the other end of R8 is connected with the ground, the other end of R7 is connected with the 3rd pin of the adjustable resistance RP3; the 3rd pin of the operational amplifier U2 is connected with the other end of R14; the 4th pin of the operational amplifier U2 is connected with the ground; the 5th pin of the operational amplifier U2 is connected with one end of R9, R12, the other end of R9 is connected with the 2nd pin of the inductor L2 of the chip power supply part and the 8th pin of the operational amplifier U2; the other end of R12 is connected with the ground; the 6th pin of the operational amplifier U2 is connected with R10 and the 2nd pin of the adjustable resistance RP2; the 3rd pin of the adjustable resistance RP2 is connected with the ground; R10 is connected with the 1st pin of the terminal J4, one end of R22 and the emitter of the Darlington tube T1; the other end of R22 is connected with the negative pole of the stabilizing diode D6, the negative pole of the rectifier diode D4 and the base of the Darlington tube T1; the positive pole of the stabilizing diode D6 is connected with the ground; the positive pole of the rectifier diode D4 is connected with the 1st pin of the terminal J4 and the collector of the Darlington tube T1; the 7th pin of the operational amplifier U2 is connected with one end of R32; the 8th pin of the operational amplifier U2 is connected with one end of C21; the other end of C21 is connected with the ground; the other end of R32 is connected with the positive pole of the light emitting diode D5; the negative pole of the light emitting diode D5 is connected with the other end of R33 and the 3rd pin of the PWM controller U1 of the output regulating part.

[0036] The output regulating part includes PWM controller, adjustable resistance, etc. The 1st pin of the PWM controller U1 is connected with C2 and one end of R4; the 2nd pin of the PWM controller U1 is connected with C2, the other end of R4, R13 and one end of R15; the other end of R13 is connected with the ground; the other end of R15 is connected with the 2nd pin and 3rd pin of the adjustable resistance RP1; the 1st pin of the adjustable resistance RP1 is connected with the positive pole of the output terminal J2; the 4th pin of the PWM controller U1 is connected with C1 and one end of R11; the other end of C1 is connected with the ground; the other end of R11 is connected with one end of C3 and the 8th pin of the PWM controller U1; the other end of C3 is connected with the ground; the 5th pin of the PWM controller U1 is connected with the ground; the 7th pin of the PWM controller U1 is connected with the 2nd pin of the inductor L2 of the chip power supply part.

[0037] The fuse is additionally arranged in the voltage boosting part to prevent the input current from being too large to damage the device and load, and the reliability of the design is improved; the inductor storage and energy release are controlled by the on and off of the switch tube Q1, and the inductor with large capacity is used to maintain the continuous and stable current during the discharging process, the voltage generated by the input voltage and the inductor is superimposed to charge the output capacitor through the Schottky diode, and the load is powered. The voltage output by the capacitor is the raised voltage.

[0038] The chip U5 is additionally arranged in the chip power supply part to control the power supply of each part of the module. When the input voltage is less than the start voltage, the input adjustment and output adjustment parts of the module are ensured not to work, the voltage obtained at the output terminal is equal to the input voltage, and the voltage boosting module does not work. When the input voltage is greater than or equal to the start voltage, the chip U5 can make each part obtain stable voltage to work.

[0039] The chip input adjustment increases the input under-voltage protection function. After the input terminal supplies power, if the input voltage is less than the set value, the under-voltage indicator of the module will light up. During use, the real-time situation of the input terminal can be judged according to the indicator, the input under-voltage protection function can prevent the battery from over-discharging and the solar panel from being unable to start due to too low voltage, effectively ensures the voltage supply precision of the voltage boosting system, and then adjusts the related slide resistor RP2 to ensure the normal work of the load connected to the output terminal.

[0040] The chip output adjustment adopts the PWM controller U1 to control the switching frequency of the switch tube Q1. When the input voltage VIN is constant, the output voltage changes when the pulse duty cycle changes. The pulse duty cycle is adjusted through negative feedback. The output resistor R15, R4 and the slide resistor RP1 are connected in series, wherein R4 is used as a feedback resistor. The voltage on R4 is input to the feedback end VFB of U1 and compared with the internal 2.5V reference voltage. When the voltage on R4 is greater than 2.5V, the pulse duty cycle decreases, the output voltage decreases, and the voltage on R4 decreases. Conversely, the same applies. In this circuit, the PWM controller U1 can adjust the output voltage value according to the output adjustment resistor RP1, and can also adjust the output according to the sampling current value, so that the module can more accurately ensure the stability of the output value.

[0041] In specific work, after the input terminal is connected to the external power supply, the chip power supply part generates a voltage VCC that can drive the operation of each part of the chip, so that each part of the module operates normally. After adjusting the adjustable resistor RP1, the voltage at the 2 pin of the PWM controller U1 changes, thereby affecting the duty cycle of the output of the 8 pin of the PWM controller U1. After the duty cycle changes, the switching frequency of the field effect tube Q1 changes, thereby the charging frequency of the energy storage inductor L1 to the voltage boosting part changes, and finally the output voltage of the terminal J2 changes.

[0042] Adjusting the adjustable resistor RP2 makes the 6-pin voltage of the operational amplifier U2 change, thereby changing the output voltage of the 7-pin of the operational amplifier U2; adjusting the adjustable resistor RP3 changes the current through the resistor R33, so that the 3-pin current sensing end of the PWM controller U1 changes, the pulse duty cycle changes, thereby changing the switching frequency of the field effect transistor Q1, and finally changing the output voltage of the boost part.

[0043] Taking solar energy as an example, the light intensity is different at different times of the day, so the voltage generated by the solar panel will also be different, as long as the solar energy provides a voltage in the range of 12-60V, the application of the design can achieve stable voltage boosting effect, connected to the application load directly, greatly improving the utilization efficiency of solar energy.

[0044] The design can adjust different output voltages for different load use scenarios within the same range of wide input voltage, and the output voltage stable amplitude is adjustable, has the overcurrent protection function, makes the power safety greatly promotes, for example, on the solar energy rechargeable new energy automobile, can adjust the output to 92V and charge it, if it is used in the conventional electric vehicle, it can be adjusted to 64V or 48V for use, without changing any accessories and design scheme.

[0045] As described above, by means of the above technical scheme of the present application, the voltage or current variation is fed back to the output adjusting part by adjusting the adjustable resistor of the power boost part, and the chip of the output adjusting part adjusts the duty cycle of the output pulse according to the feedback signal, so as to change the output voltage of the boost part. The present application can adjust different output voltages for different load use scenarios within the same range of wide input voltage, and the output voltage stable amplitude is adjustable, has the overcurrent protection function, makes the power safety greatly promotes.

[0046] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A variable output voltage boosting device, characterized by, The power supply booster part, the chip power supply part, the input adjustment part and the output adjustment part are included. The input terminal J1 is connected with the positive pole of the external power supply at one end, and with the negative pole of the external power supply at the other end. The 1-pin of the input terminal J1 is connected with the ground. The 2-pin of the input terminal J1 is connected with one end of the fuse FU1. The other end of the fuse FU1 is connected with one end of the filter capacitor C4, one end of the filter capacitor C9, one end of the energy storage inductor L1 and the positive pole of the rectifier diode D7 respectively. The other ends of the filter capacitor C4 and the filter capacitor C9 are both connected with the ground. The other end of the energy storage inductor L1 is connected with the positive pole of the Schottky diode D1 and the drain of the field effect transistor Q1 respectively. The negative pole of the Schottky diode D1 is connected with one end of the capacitor C7, one end of the capacitor C8, one end of the capacitor C13, the 1-pin of the output terminal J2 and the 3-pin of the adjustable resistor RP1 of the output adjustment part respectively. The other ends of the capacitor C7, the capacitor C8, the capacitor C13 and the 2-pin of the output terminal J2 are all connected with the ground. The gate of the field effect transistor Q1 is connected with one end of the resistor R1. The PWM controller U1 of the output adjustment part is connected with one end of the capacitor C2 and one end of the resistor R4 at the 1-pin respectively. The 2-pin of the PWM controller U1 is connected with the other end of the capacitor C2, the other end of the resistor R4, one end of the resistor R13 and one end of the resistor R15 respectively. The other end of the resistor R13 is connected with the ground. The other end of the resistor R15 is connected with the 1-pin and the 2-pin of the adjustable resistor RP1. The 4-pin of the PWM controller U1 is connected with one end of the capacitor C1 and one end of the resistor R11 respectively. The other end of the resistor R11 is connected with one end of the capacitor C3 and the 8-pin of the PWM controller U1 respectively. The other end of the capacitor C1 and the other end of the capacitor C3 are both connected with the ground. The 5-pin of the PWM controller U1 is connected with the ground. The 6-pin of the PWM controller U1 is connected with the other end of the resistor R1 of the power supply booster part. The 1-pin of the operational amplifier U2 of the input adjustment part is connected with one end of the resistor R33. The 3-pin of the operational amplifier U2 is connected with one end of the sampling resistor R14. The 7-pin of the operational amplifier U2 is connected with one end of the resistor R32. The other end of the resistor R32 is connected with the positive pole of the light emitting diode D5. The other end of the resistor R33 of the input adjustment part and the negative pole of the light emitting diode D5 are both connected with the 3-pin of the PWM controller U1. The other end of the sampling resistor R14 is connected with one end of the sampling resistor R6, one end of the sampling resistor R31 and the source of the field effect transistor Q1 of the power supply booster part respectively.

2. The adjustable output boost device of claim 1, wherein, The 1 pin of the operational amplifier U2 is connected with the 1 pin and 2 pin of the adjustable resistance RP3; the 2 pin of the operational amplifier U2 is connected with one end of the resistance R7 and R8, the other end of the resistance R7 is connected with the 3 pin of the adjustable resistance RP3, and the other end of the resistance R8 is connected with the ground; the 5 pin of the operational amplifier U2 is connected with one end of the resistance R9 and one end of the resistance R12 respectively, and the other end of the resistance R12 and the 4 pin of the operational amplifier U2 are both connected with the ground; the 8 pin of the operational amplifier U2 is connected with one end of the capacitor C21, and the other end of the capacitor C21 is connected with the ground.

3. The adjustable output boost device of claim 2, wherein, The other end of the sampling resistance R6 and R31 is connected with the ground.

4. The adjustable output boost device of claim 2, wherein, The 6 pin of the operational amplifier U2 is connected with one end of the resistance R10 and the 2 pin of the adjustable resistance RP2, the other end of the resistance R10 is connected with one end of the resistance R22, the emitter of the Darlington tube T1, the 3 pin of the terminal J4 and the negative pole of the rectifier diode D7, the 3 pin of the adjustable resistance RP2 is connected with the ground, and the other end of the resistance R22 is connected with the base of the Darlington tube T1, the negative pole of the rectifier diode D4 and the negative pole of the voltage stabilizing diode D6 respectively, the collector of the Darlington tube T1 and the positive pole of the rectifier diode D4 are both connected with the 1 pin of the terminal J4, and the positive pole of the voltage stabilizing diode D6 is connected with the ground.

5. The adjustable output boost device of claim 4, wherein, The chip power supply part includes the direct current voltage reduction chip U5, the 1 pin of the direct current voltage reduction chip U5 is connected with the 2 pin of the terminal J4 of the input adjusting part, one end of the filter capacitor C6 and one end of C11 respectively; the 2 pin of the direct current voltage reduction chip U5 is connected with the negative pole of the diode D2 and one end of the inductor L2 respectively, the other end of the inductor L2 is connected with one end of the capacitor C20, C10, C12, one end of the resistance R2, the other end of the resistance R9 of the input adjusting part, the 8 pin of the operational amplifier U2 and the 7 pin of the PWM controller U1 of the output adjusting part respectively, and the other end of the filter capacitor C6, the other end of C11, the positive pole of the diode D2, the other end of the capacitor C10 and the other end of the capacitor C20 are all connected with the ground; the 3 pin of the direct current voltage reduction chip U5 is connected with the other end of the capacitor C12, the other end of the resistance R2 and one end of the resistance R3 respectively; the 4 pin, 5 pin, 6 pin, 7 pin and 8 pin of the direct current voltage reduction chip U5 and the other end of the resistance R3 are all connected with the ground.

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