阅读说明：本技术 一种带隔离的电源电路 (Power supply circuit with isolation ) 是由 施广飞 杨涛 吴海林 虞翔 曾玉兰 李阳 于 2019-03-29 设计创作，主要内容包括：本发明涉及一种带隔离的电源电路,包括以下结构：变压器,所述的变压器将输入电源转换为四路电压,其中,第一路为10V电压,经过第一稳压器输出+5V电压；第二路为12V电压,经过DC-DC异步开关调节器后变为5.6V电压,然后经过两个并联的第一线性稳压器和第二线性稳压器,得到二路+5V电压；第三路为12V电压,经过开关电源后变为-7V电压,然后进过第三线性稳压器得到-5V电压；第四路为12V电压,经过升压电源芯片后,经过两个并联的第二稳压器和第三稳压器,得到一路+15V电压和一路-15V电压。与现有技术相比,本发明为陀螺与加速度计及相关电路提供所需的各种电源,可满足光纤惯性测量装置在各种使用条件下功耗及电压精度要求。(The invention relates to a power supply circuit with isolation, which comprises the following structures: the transformer converts an input power supply into four paths of voltage, wherein the first path is 10V voltage, and +5V voltage is output through the first voltage stabilizer; the second path is 12V voltage, the voltage is changed into 5.6V voltage after passing through a DC-DC asynchronous switching regulator, and then the voltage is subjected to two paths of +5V voltage by two first linear voltage stabilizers and two second linear voltage stabilizers which are connected in parallel; the third path is 12V voltage, becomes-7V voltage after passing through a switching power supply, and then is subjected to a third linear voltage stabilizer to obtain-5V voltage; the fourth path is 12V voltage, and after passing through the boosting power supply chip, the fourth path passes through two second voltage stabilizers and a third voltage stabilizer which are connected in parallel to obtain one path of +15V voltage and one path of-15V voltage. Compared with the prior art, the invention provides various power supplies for the gyroscope, the accelerometer and related circuits, and can meet the requirements of power consumption and voltage precision of the optical fiber inertia measuring device under various use conditions.)

1. A power supply circuit with isolation, comprising the following structure:

a transformer (1), said transformer (1) converting an input power into four-way voltage, wherein,

the first path is 10V voltage, and +5V voltage is output through a first voltage stabilizer (11);

the second path is 12V voltage, the voltage is changed into 5.6V voltage after passing through a DC-DC asynchronous switching regulator (21), and then the voltage is converted into two paths of +5V voltage after passing through two first linear voltage stabilizers (22) and a second linear voltage stabilizer (23) which are connected in parallel;

the third path is 12V voltage, is changed into-7V voltage after passing through a switching power supply (31), and then is subjected to a third linear voltage stabilizer (32) to obtain-5V voltage;

the fourth path is 12V voltage, and after passing through a boosting power supply chip (41), the fourth path passes through two second voltage regulators (42) and a third voltage regulator (43) which are connected in parallel to obtain one path of +15V voltage and one path of-15V voltage.

2. The isolated power supply circuit of claim 1, wherein said first voltage regulator (11) is MC78L 05.

3. An isolated power supply circuit according to claim 1, wherein the transformer (1) is a variable transformer.

4. The isolated power supply circuit of claim 1, wherein the transformer (1) is further connected with a flyback secondary side synchronous rectification driver (5).

5. The isolated power supply circuit of claim 4, wherein the flyback secondary side synchronous rectification driver (5) is LT 8309.

6. The isolated power supply circuit of claim 1, wherein said DC-DC asynchronous switching regulator (21) is ADP 2303.

7. The power supply circuit with isolation of claim 1, further comprising a switching regulator controller (6), wherein the input end of the switching regulator controller (6) is connected to the input power supply, and the output end of the switching regulator controller is connected to the transformer (2).

8. The isolated power supply circuit of claim 7, wherein the switching regulator controller (6) is LT 3748.

Technical Field

The invention relates to a power supply circuit of an optical fiber inertia measuring device, in particular to a power supply circuit with isolation.

Background

The optical fiber inertia measuring device mainly comprises 3 gyroscopes, 3 accelerometers, a signal processing circuit, a power supply circuit and a shell. The method mainly measures the axial acceleration and angular velocity of three coordinates of an object in real time, and provides the acceleration and angular velocity to a navigation computer for attitude calculation and navigation calculation. The power supply circuit meets the requirements of an upper client unit: the primary power supply is 28V, and the maximum working current can reach 3A; the secondary power supply is divided into +/-15V, +5V2 and +5V3 (for supplying power to the output serial port); the primary power ground is isolated from the secondary power ground, and the serial port is digitally isolated from the other secondary power grounds. Further, the operating requirements of the secondary power source are shown in table 1:

TABLE 1 operating requirements of Secondary Power supply

Therefore, it is necessary to design a power circuit with isolation to provide various required power supplies for the gyroscope, the accelerometer and related circuits, and to meet the requirements of the optical fiber inertial measurement unit on power consumption and voltage accuracy under various use conditions.

Disclosure of Invention

The present invention is directed to a power supply circuit with isolation to overcome the above-mentioned drawbacks of the prior art.

The purpose of the invention can be realized by the following technical scheme:

an isolated power supply circuit, comprising the following structure:

a transformer converting an input power into four-way voltage, wherein,

the first path is 10V voltage, and +5V voltage is output through the first voltage stabilizer;

the second path is 12V voltage, the voltage is changed into 5.6V voltage after passing through a DC-DC asynchronous switching regulator, and then the voltage is subjected to two paths of +5V voltage by two first linear voltage stabilizers and two second linear voltage stabilizers which are connected in parallel;

the third path is 12V voltage, becomes-7V voltage after passing through a switching power supply, and then is subjected to a third linear voltage stabilizer to obtain-5V voltage;

the fourth path is 12V voltage, and after passing through the boosting power supply chip, the fourth path passes through two second voltage stabilizers and a third voltage stabilizer which are connected in parallel to obtain one path of +15V voltage and one path of-15V voltage.

The first voltage regulator is MC78L 05.

The transformer is an adjustable transformer.

The transformer is also connected with a flyback secondary side synchronous rectification driver.

The flyback secondary side synchronous rectification driver is LT 8309.

The DC-DC asynchronous switching regulator is ADP 2303.

The power circuit further comprises a switch voltage-stabilizing controller, wherein the input end of the switch voltage-stabilizing controller is connected with the input power supply, and the output end of the switch voltage-stabilizing controller is connected with the transformer.

The switching voltage stabilizing controller is LT 3748.

Compared with the prior art, the invention has the following advantages:

(1) the invention relates to a power supply circuit with isolation specially developed aiming at use requirements, which provides various required power supplies for a gyroscope, an accelerometer and related circuits and meets the requirements of power consumption and voltage precision of an optical fiber inertia measuring device under various use conditions.

(2) The output voltage has high precision, small ripple, high working efficiency, high reliability, multiple output voltage circuits and large output power, and is suitable for the related application field of power circuits.

(3) The LT3748 is a switching voltage stabilizing controller which is specially designed for an isolated flyback topology structure, can improve power and has a wide input voltage range of 5V to 100V.

(4) The flyback secondary side synchronous rectification driver adopts LT8309, the device adopts RDS (ON) voltage drop of an external N-channel MOSFET to replace the forward voltage drop of an output diode, the power consumption is reduced, the efficiency of the converter is improved, the burden of thermal design is relieved, and the output current of 10A can be allowed without using a radiator.

(5) The DC-DC asynchronous switching regulator adopts ADP2303, the input voltage range supported by the device is 3V to 20V, the output current can reach 2A, the output voltage can be adjusted between 0.8V and 80% of the input voltage, the regulator adopts a current mode and a fixed frequency PWM (pulse width modulation) framework, excellent stability and transient response performance can be provided, and multi-device time sequence control can be realized.

Drawings

FIG. 1 is a schematic diagram of a power circuit of the present embodiment;

reference numerals:

1 is a transformer; 11 is a first voltage stabilizer; 21 is a DC-DC asynchronous switching regulator; 22 is a first linear regulator; 23 is a second linear regulator; 31 is a switching power supply; 32 is a third linear regulator; 41 is a boosting power supply chip; 42 is a second voltage regulator; 43 is a third voltage regulator; 5 is a flyback secondary side synchronous rectification driver; and 6 is a switching voltage stabilizing controller.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.