Circuit for controlling voltage drop through single-chip microcomputer

Abstract

The invention provides a circuit for controlling voltage drop through a single chip microcomputer. The circuit comprises a rectifier bridge, the single chip microcomputer U1, switching tubes Q1 and Q2, current-limiting resistors R1 and R2 and capacitors C1, C2 and C3. The input end of the rectifier bridge is connected with an alternating current mains supply, and a direct current output positive electrode is connected to the first driving signal output end of the single-chip microcomputer U1 through a switching tube Q1 and a current-limiting resistor R1. A second driving signal output end of the single chip microcomputer U1 forms an output positive electrode through a current-limiting resistor R2 and a switching tube Q2, and the output positive electrode is further connected to a direct current output negative electrode of the rectifier bridge through a capacitor C3; a capacitor C1 is connected between the direct current output positive electrode and the direct current output negative electrode of the rectifier bridge; the emitting electrodes of the switching tubes Q1 and Q2 are connected with each other and are connected to the direct current output negative electrode of the rectifier bridge through a capacitor C2; the single-chip microcomputer U1 controls the conduction time of the switching tubes Q1 and Q2 to adjust the change of the voltage of the output positive electrode. When the switch tube Q1 is conducted and the switch tube Q2 is turned off, the capacitor C2 stores energy; when the switch tube Q1 is switched off and the switch tube Q2 is switched on, the energy of the capacitor C2 is transmitted to the capacitor C3 through the switch tube Q2.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of through single-chip microcontroller control voltage drop circuit. BACKGROUND

[0002] Unlike linear power supply, switching power supply uses switching transistor, which is mostly switched between full-on mode (saturation region) and full-off mode (cut-off region), both of which have low dissipation characteristics, and the transition between switching has high dissipation, but the time is very short, so it is more energy-saving and produces less waste heat. Ideally, switching power supply itself does not consume power. Voltage stabilization is achieved by adjusting the on and off time of the transistor. On the contrary, in the process of generating output voltage, the transistor of linear power supply works in amplification region, which also consumes power. The high conversion efficiency of switching power supply is one of its great advantages, and because the switching power supply works at high frequency, it can use small size and light weight transformer, so the size of switching power supply is smaller than that of linear power supply, and the weight is also lighter.

[0003] Currently, the switching power supply product circuit with variable voltage on the market has many devices, high cost, great difficulty in production, high failure rate and low production capacity. SUMMARY

[0004] The main technical problem to be solved by the present application is to provide a circuit for controlling voltage drop through a single-chip microcontroller, which has a simple structure and fewer devices.

[0005] To solve the above technical problems, the present application provides a circuit for controlling voltage drop through a single-chip microcontroller, which comprises: a rectifier bridge, a single-chip microcontroller U1, switching tubes Q1 and Q2, current limiting resistors R1 and R2, capacitors C1, C2 and C3.

[0006] The input end of the rectifier bridge is connected to AC mains, and the positive DC output is connected to the first drive signal output end of the single-chip microcontroller U1 through the switching tube Q1 and the current limiting resistor R1; the second drive signal output end of the single-chip microcontroller U1 forms an output positive pole through the current limiting resistor R2 and the switching tube Q2, and the output positive pole is also connected to the negative DC output of the rectifier bridge through the capacitor C3.

[0007] The positive and negative DC outputs of the rectifier bridge are connected to the capacitor C1; the emitters of the switching tubes Q1 and Q2 are connected to each other and connected to the negative DC output of the rectifier bridge through the capacitor C2.

[0008] The single-chip microcontroller U1 controls the conduction time of the switching tubes Q1 and Q2 to adjust the voltage change of the output positive pole; when the switching tube Q1 is on and the switching tube Q2 is off, the capacitor C2 stores energy; when the switching tube Q1 is off and the switching tube Q2 is on, the energy of the capacitor C2 is transmitted to the capacitor C3 through the switching tube Q2.

[0009] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0010] The present application provides a circuit for controlling pressure drop by a single-chip microcomputer, which controls the on-time and off-time of two switching tubes by a single-chip microcomputer U1 to realize the change of output voltage, and when the switching tube Q1 is on and Q2 is off, the energy is stored in the capacitor C2, and when the switching tube Q1 is off and Q2 is on, the energy of the capacitor C2 is transmitted to the capacitor C3 through the switching tube Q2 to store energy for the output voltage, and the change of output voltage can be realized by changing the on-time and off-time of the switching tubes Q1 and Q2. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The circuit diagram of the preferred embodiment of the present application. DETAILED DESCRIPTION

[0012] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application; obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the present application are within the protection scope of the present application.

[0013] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0014] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be understood broadly, for example, "connected" can be wall-mounted connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, can be indirectly connected through an intermediate medium, can be the communication between two elements, and those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0015] REFERENCE Figure 1 The present embodiment provides a circuit for controlling pressure drop by a single-chip microcomputer, which comprises a rectifier bridge, a single-chip microcomputer U1, switching tubes Q1 and Q2, current-limiting resistors R1 and R2, capacitors C1, C2 and C3.

[0016] The input terminal of the rectifier bridge is connected to AC mains power, and the positive DC output terminal is connected to the first drive signal output terminal of the microcontroller U1 through the switching transistor Q1 and the current limiting resistor R1; the second drive signal output terminal of the microcontroller U1 forms the positive output terminal through the current limiting resistor R2 and the switching transistor Q2, and the positive output terminal is also connected to the negative DC output terminal of the rectifier bridge through the capacitor C3.

[0017] A capacitor C1 is connected between the positive and negative terminals of the DC output of the rectifier bridge; the emitters of the switching transistors Q1 and Q2 are connected to each other and connected to the negative terminal of the DC output of the rectifier bridge through a capacitor C2.

[0018] The microcontroller U1 controls the conduction time of switches Q1 and Q2 to adjust the voltage change of the output positive terminal; when switch Q1 is on and Q2 is off, capacitor C2 stores energy; when switch Q1 is off and Q2 is on, the energy of capacitor C2 is transferred to capacitor C3 through switch Q2.

[0019] The circuit described above, which controls the voltage drop via a microcontroller, uses microcontroller U1 to control the on-time and off-time of two switching transistors to achieve changes in the output voltage. When switching transistor Q1 is on and Q2 is off, energy is stored in capacitor C2. When switching transistor Q1 is off and Q2 is on, the energy in capacitor C2 is transferred to capacitor C3 through switching transistor Q2, storing energy for the output voltage. By changing the on-time and off-time of switching transistors Q1 and Q2, the output voltage can be changed.

[0020] The above description is merely a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention by those skilled in the art within the scope of the technology disclosed in the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A circuit for controlling voltage drop via a microcontroller, characterized in that... include: Rectifier bridge, microcontroller U1, switching transistors Q1 and Q2, current limiting resistors R1 and R2, capacitors C1, C2, and C3; The input terminal of the rectifier bridge is connected to AC mains power, and the positive DC output terminal is connected to the first drive signal output terminal of the microcontroller U1 through the switching transistor Q1 and the current limiting resistor R1; the second drive signal output terminal of the microcontroller U1 forms the positive output terminal through the current limiting resistor R2 and the switching transistor Q2, and the positive output terminal is also connected to the negative DC output terminal of the rectifier bridge through the capacitor C3. A capacitor C1 is connected between the positive and negative terminals of the DC output of the rectifier bridge; the emitters of the switching transistors Q1 and Q2 are connected to each other and connected to the negative terminal of the DC output of the rectifier bridge through a capacitor C2. The microcontroller U1 controls the conduction time of switches Q1 and Q2 to adjust the voltage change of the output positive terminal; when switch Q1 is on and Q2 is off, capacitor C2 stores energy; when switch Q1 is off and Q2 is on, the energy of capacitor C2 is transferred to capacitor C3 through switch Q2.

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