CN203352446U - DC-DC voltage conversion circuit - Google Patents

Abstract

The utility model discloses a DC-DC direct current voltage conversion circuit. The utility model includes recovery diode D602, glass package development diode D603, glass package development diode D604, glass package development diode D605, glass package development diode D606, transformer B601, capacitor C10, capacitor C11, capacitor C12, electrolytic capacitor C603, electrolytic capacitor C605, resistor R12, 78L05 three-terminal regulator T601, IRFU110 FET M601. The circuit of the utility model has low power consumption and high precision, and is suitable for systems requiring high precision.

Description

A DC-DC DC voltage conversion circuit

technical field

The utility model belongs to the technical field of power supply, and relates to a DC-DC direct current voltage conversion circuit applied to communication equipment and the like.

Background technique

A DC-DC DC voltage conversion circuit is a circuit topology that converts one DC voltage into another DC voltage. Generally, the low-power DC voltage conversion circuit uses Buck (step-down) and Boost (boost) modes. For high power, flyback, half-bridge, push-pull or full-bridge circuit topologies are used. According to the structure, there is a difference between isolation and non-isolation, that is, the transformer electrically isolates the input and output, and the energy is transferred to the output through magnetic energy. What is not isolated is the direct change through the switch tube. For example, the simplest DC-DC DC voltage conversion circuit is the car charger. The voltage of the battery on the car is generally DC10-14.5V, which can be converted to 5V voltage by a DC-DC Buck circuit, which can charge the mobile phone. If the Boost circuit is used, it can be converted to about 19V to charge the laptop. The circuit used in this DC-DC DC voltage conversion circuit is a switching mode, which is a switching power supply. It has high efficiency and saves energy. Generally, it can reach about 90%. So it can be used on a large scale. If a linear circuit is used, the conversion efficiency will be very low and most of the energy will be lost. It is rarely used at present.

Contents of the invention

The utility model provides a DC-DC direct current voltage conversion circuit aiming at the deficiencies of the prior art.

The utility model adopts the following technical solutions:

DC-DC DC voltage conversion circuit, including recovery diode D602, glass package development diode D603, glass package development diode D604, glass package development diode D605, glass package development diode D606, transformer B601, capacitor C10, capacitor C11, capacitor C12, electrolysis Capacitor C603, electrolytic capacitor C605, resistor R12, 78L05 three-terminal regulator T601, IRFU110 FET M601. The anode of the recovery diode D602 is grounded, the cathode is connected to one end of the primary side of the transformer B601, the input DC voltage VCC is respectively connected to one end of the capacitor C10 and the other end of the primary side of the transformer B601, the other end of the capacitor C10 is connected to one end of the resistor R12, and the other end of the resistor R12 is respectively Connect the drain of IRFU110 field effect transistor M601, the primary side of the transformer B601 and the other end; the drain and source of IRFU110 field effect transistor M601 are grounded, and the gate is connected to the input frequency signal.

The anode of the glass package development diode D603 is respectively connected to the cathode of the glass package development diode D605, and connected to one end of the secondary side of the transformer B601; the anode of the glass package development diode D604 is respectively connected to the cathode of the glass package development diode D606, and connected to the other end of the secondary side of the transformer B601; Packaging development diode D603 cathode, glass packaging development diode D604 cathode, electrolytic capacitor C603 positive pole, capacitor C11 one end connected to 3 pins of 78L05 three-terminal voltage regulator T601; glass packaging development diode D605 anode, glass packaging development diode D606 anode, electrolytic The negative pole of capacitor C603, the other end of capacitor C11, and the 2 pins of 78L05 three-terminal regulated power regulator T601 are grounded; the 1 pin of 78L05 three-terminal regulated power regulator T601 is respectively connected to the positive pole of electrolytic capacitor C605 and one end of capacitor C12, and used as At the DC voltage output end, the negative electrode of the electrolytic capacitor C605 and the other end of the capacitor C12 are grounded.

The utility model has beneficial effects: the circuit has low power consumption and high precision, and is suitable for systems requiring high precision.

Description of drawings

Fig. 1 is the schematic circuit diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the utility model includes recovery diode D602, glass package development diode D603, glass package development diode D604, glass package development diode D605, glass package development diode D606, transformer B601, capacitor C10, capacitor C11, capacitor C12, Electrolytic capacitor C603, electrolytic capacitor C605, resistor R12, 78L05 three-terminal voltage regulator T601, IRFU110 field effect tube M601; recovery diode D602 is grounded at one end along the conduction direction, and one end is connected to the primary side of transformer B601, and the input DC voltage VCC is connected to On the primary side of transformer B601, capacitor C10 is connected to resistor R12 in parallel with VCC and then connected to the primary side of transformer B601. The drain of IRFU110 FET M601 is connected to resistor R12 on the primary side of transformer B601, the source is grounded, and the gate is connected to the input Frequency signal, glass-encapsulated development diode D603, glass-encapsulated development diode D604, glass-encapsulated development diode D605 and glass-encapsulated development diode D606 are connected to form a bridge rectifier circuit. , then connect the positive terminal to the Vin port of the 78L05 three-terminal regulated power regulator T601, connect the negative terminal to the GND port of the 78L05 three-terminal regulated power regulator T601, and finally connect the capacitor C12 and the electrolytic capacitor C605 in parallel to form an output For the filter circuit, connect the positive terminal to the Vout port of the 78L05 three-terminal regulated power supply regulator T601, and connect the negative terminal to the GND port of the 78L05 three-terminal regulated power supply regulator T601. The recovery diode D602 is used to cut off the No. 1 port on the side of the transformer B601. The capacitor C10 and the resistor R12 function to filter and limit the input DC signal. After receiving the frequency signal, the IRFU110 FET M601 regenerates the DC signal as required The AC signal, through the transformer B601, scales the AC signal in the required ratio, and at the same time has the effect of electrical isolation, and then the voltage signal output by the secondary side of the transformer B601 passes through the glass package development diode D603, the glass package development diode D604, the glass package The package development diode D605 and the glass package development diode D606 are connected to form a bridge rectifier circuit and then rectified into a DC signal. The DC signal is connected to the 78L05 three-terminal stabilized power regulator T601 after passing through the filter circuit composed of the electrolytic capacitor C603 and capacitor C11. Afterwards, the outputted +5V DC signal with higher precision is filtered by the same filter circuit composed of electrolytic capacitor C605 and capacitor C12 as before, and finally generates the high-precision +5V DC voltage signal required by the system.

Claims (1)

1. A DC-DC DC voltage conversion circuit, including recovery diode D602, glass package development diode D603, glass package development diode D604, glass package development diode D605, glass package development diode D606, transformer B601, capacitor C10, capacitor C11, Capacitor C12, electrolytic capacitor C603, electrolytic capacitor C605, resistor R12, 78L05 three-terminal voltage stabilizer regulator T601, IRFU110 field effect tube M601, characterized in that: the recovery diode D602 anode is grounded, the cathode is connected to the primary side of the transformer B601, input DC The voltage VCC is respectively connected to one end of the capacitor C10, the other end of the primary side of the transformer B601, the other end of the capacitor C10 is connected to one end of the resistor R12, and the other end of the resistor R12 is respectively connected to the drain of the IRFU110 field effect transistor M601, and the primary side of the transformer B601 and the other end ;IRFU110 field effect transistor M601 drain source is grounded, and the gate is connected to the input frequency signal; The anode of the glass package development diode D603 is respectively connected to the cathode of the glass package development diode D605, and connected to one end of the secondary side of the transformer B601; the anode of the glass package development diode D604 is respectively connected to the cathode of the glass package development diode D606, and connected to the other end of the secondary side of the transformer B601; Packaging development diode D603 cathode, glass packaging development diode D604 cathode, electrolytic capacitor C603 positive pole, capacitor C11 one end connected to 3 pins of 78L05 three-terminal voltage regulator T601; glass packaging development diode D605 anode, glass packaging development diode D606 anode, electrolytic The negative pole of capacitor C603, the other end of capacitor C11, and the 2 pins of 78L05 three-terminal regulated power regulator T601 are grounded; the 1 pin of 78L05 three-terminal regulated power regulator T601 is respectively connected to the positive pole of electrolytic capacitor C605 and one end of capacitor C12, and used as At the DC voltage output end, the negative electrode of the electrolytic capacitor C605 and the other end of the capacitor C12 are grounded.