Voltage adjustable circuit structure based on control MOSFET (Metal Oxide Semiconductor Field Effect Transistor)

Abstract

The utility model discloses a voltage-adjustable circuit structure based on control of an MOSFET. The GS two ends of an MOSFET power tube are provided with a voltage acquisition element and a voltage control unit. An alternating current signal is connected with the multivibrator U2 through the photoelectric isolation element U1; a CPU signal is connected with the voltage acquisition element through an operational amplifier; a square wave signal output by the multivibrator U2 and a direct current signal output by the operational amplifier are input into the comparator U103, and a sawtooth waveform signal output by the comparator U103 is connected with the voltage control unit. On and off are controlled by controlling the voltage at the two ends of the GS of the MOSFET power tube, the actual output precision of the power supply can be improved, and the low power consumption of circuit components and instruments can be reduced.

Description

Technical Field

[0001] The utility model relates to a voltage adjustable circuit structure, in particular to a voltage adjustable circuit structure based on controlling MOSFET. Background Art

[0002] At present, the voltage adjustable circuit structure based on controlling MOSFET is one of the key circuits in high-power power supplies.

[0003] In the prior art, the linear adjustment circuit includes a first transistor Q13, a second transistor Q15, a diode D7, a MOS transistor Q17, a voltage regulator ZD1, a resistor, a capacitor and a fuse; the drive signal MOSDIV is connected to the base of the second transistor Q15, the emitter of the second transistor Q15 is connected to the resistor and then connected to the +12V power supply through the voltage regulator ZD1, and the collector is connected to the -12V power supply; the collector of the first transistor Q13 is connected to the cathode of the diode D2, and the emitter is connected to the cathode of the diode D2. Pre-stabilization signal P7, the base is connected to the right end of the fuse and the left end of the three parallel resistors; the drain of MOS tube Q17 is grounded through a capacitor and connected to the emitter of the second triode Q15, the source is connected to the base of the first triode Q13 and the left end of the three parallel resistors after the fuse, the gate is connected to the positive electrode of the diode D7 after the resistor, and a voltage regulator is connected between the source and the drain; a resistor is connected in series to the positive electrode of the diode D7, and a capacitor is connected in parallel to the emitter of the second triode Q15. Linear adjustment structure completely controlled by the MOSDIV drive signal.

[0004] Disadvantages of existing technology:

[0005] Once MOSDIV is abnormal, the circuit will fail. The stability is relatively lower than that of the present invention.

[0006] In view of this, the present utility model is proposed. Utility Model Content

[0007] The purpose of the utility model is to provide a voltage adjustable circuit structure based on controlling MOSFET to solve the above technical problems existing in the prior art.

[0008] The purpose of this utility model is achieved through the following technical solutions:

[0009] The utility model is a voltage adjustable circuit structure based on controlling MOSFET, characterized in that voltage collection elements and voltage control units are provided at both ends of the GS of the MOSFET power tube;

[0010] The AC signal is connected to the multivibrator U2 through the optoelectronic isolation element U1;

[0011] The CPU signal is connected to the voltage collection element through an operational amplifier;

[0012] The square wave signal output by the multivibrator U2 and the DC signal output by the operational amplifier are input to the comparator U103, and the sawtooth waveform signal output by the comparator U103 is connected to the voltage control unit.

[0013] Compared with the prior art, the voltage-adjustable circuit structure based on controlling MOSFET provided by the utility model can improve the actual output accuracy of the power supply, reduce the power consumption of circuit components and the instrument itself, by controlling the voltage at both ends of the GS of the MOSFET power tube to control the on and off. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of a voltage adjustable circuit structure based on controlling MOSFET provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, which does not constitute a limitation of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0016] First, the terms that may be used in this article are explained as follows:

[0017] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0018] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0019] The contents not described in detail in the examples of the present utility model belong to the prior art known to professionals in the field. If no specific conditions are specified in the examples of the present utility model, the conditions are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments used in the examples of the present utility model are not specified, they are all conventional products that can be purchased commercially.

[0020] The voltage adjustable circuit structure based on controlling MOSFET of the present invention has voltage collection elements and voltage control units at both ends of the GS of the MOSFET power tube;

[0021] The AC signal is connected to the multivibrator U2 through the optoelectronic isolation element U1;

[0022] The CPU signal is connected to the voltage collection element through an operational amplifier;

[0023] The square wave signal output by the multivibrator U2 and the DC signal output by the operational amplifier are input to the comparator U103, and the sawtooth waveform signal output by the comparator U103 is connected to the voltage control unit.

[0024] From the above, it can be seen that the voltage adjustable circuit structure based on controlling MOSFET in the embodiment of the present invention controls the on and off by controlling the voltage at both ends of GS of the MOSFET power tube. The AC signal forms a fixed square wave signal after passing through the multivibrator, and then forms a sawtooth wave signal after passing through the comparator. One end of the comparator is the CPU signal, which collects the voltage at both ends of the MOSFET and converts it into a DC component. The AC input voltage is the sum of the MOSFET withstand voltage and the output port voltage.

[0025] The circuit structure of the present invention can improve the actual output accuracy of the power supply and reduce the power consumption of circuit components and the instrument itself.

[0026] The voltage adjustable circuit based on controlling MOSFET is suitable for realizing various programmable linear power supply circuits. Its main advantage is that it can realize stable power output and reduce circuit power consumption. The voltage adjustable circuit structure based on controlling MOSFET directly controls the on and off of MOSFET after the AC signal is processed, which reduces circuit redundancy and makes the overall circuit efficient.

[0027] The key technologies of the present invention are:

[0028] After passing through the multivibrator, a fixed square wave signal is formed, and then after passing through the comparator, a sawtooth wave signal is formed. One end of the comparator is the CPU signal, which collects the voltage at both ends of the MOSFET and converts it into a DC component. The AC input voltage is the sum of the MOSFET withstand voltage and the output port voltage;

[0029] The overall power consumption of the circuit can be reduced by adjusting the voltage adjustable circuit of the MOSFET.

[0030] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the embodiments of the present invention are described in detail with specific embodiments below.

[0031] The voltage adjustable circuit structure based on controlling MOSFET of the present invention is to control the on and off of the voltage at both ends of the GS of the MOSFET power tube to control the output voltage of the power supply. The AC signal forms a fixed square wave signal after passing through the multivibrator, and then forms a sawtooth wave signal after passing through the comparator. One end of the comparator is the CPU signal, and the voltage at both ends of the MOSFET is collected to become a DC component. The AC input voltage is the sum of the voltage that the MOSFET withstands and the output port voltage. The present invention can effectively reduce circuit redundancy, achieve the purpose of directly converting input to output, and ensure that the stability of the power supply is higher.

[0032] Example 1

[0033] The voltage adjustable circuit structure implementation method based on controlling MOSFET, the main circuit structure implementation method is as follows Figure 1 As shown:

[0034] The AC signal is optically isolated by U1 and then input into the multivibrator. At this time, the AC signal becomes a fixed square wave signal. The CPU signal passes through the operational amplifier and collects the MOSFET voltage to convert it into a DC signal. The above two are input into the comparator U103 to form a sawtooth waveform, which controls the voltage across the GS of the MOSFET and thus controls the actual output value of the power supply.

[0035] Beneficial effects brought by the technical solution of the present invention:

[0036] The circuit of the present invention controls the on and off by controlling the voltage at both ends of the GS of the MOSFET power tube. The AC signal forms a fixed square wave signal after passing through the multivibrator, and then forms a sawtooth wave signal after passing through the comparator. One end of the comparator is the CPU signal, and the voltage at both ends of the MOSFET is collected to become a DC component. The AC input voltage is the sum of the voltage that the MOSFET withstands and the output port voltage. The present invention can effectively reduce circuit redundancy, achieve the purpose of directly converting input to output, and ensure that the stability of the power supply is higher.

[0037] In the present invention, U2 can be replaced by a multivibrator with similar functions, and the MOSFET can be selected according to the specific voltage and current.

[0038] The purpose of low power consumption can be achieved through the circuit structure of the present invention.

[0039] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A voltage adjustable circuit structure based on controlling MOSFET, characterized in that: Voltage collection elements and voltage control units are provided at both ends of the GS of the MOSFET power tube; The AC signal is connected to the multivibrator (U2) through the optoelectronic isolation element (U1); The CPU signal is connected to the voltage collection element through an operational amplifier; The square wave signal output by the multivibrator (U2) and the direct current signal output by the operational amplifier are input to the comparator (U103), and the sawtooth waveform signal output by the comparator (U103) is connected to the voltage control unit.

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