(57) Abstract

The invention discloses a power supply circuit and its first, second, third extended power supply circuit and a method for realizing PFC and step-up/step-down based on this power supply circuit, and this power supply circuit comprises an information acquisition module, an inductor, a switch and a controller, a capacitor, a transformer, an output half-wave rectifier module for controlling the working state of the switch; The power supply circuit of the application controls the charge and discharge time of the inductor through the control of the duty cycle and frequency of the switch, and at the same time, the power factor tracking can be realized, and the dynamic adjustment of the voltage boost and the voltage drop can be realized according to the size of the input voltage and the size of the output voltage requirement of the power supply circuit to meet the load demand; Compared with the prior art, the power supply circuit unit of the present application and its first, second and third extended power supply circuits can simultaneously realize functions such as step-up, step-down and power factor tracking, so that 8 uses fewer components, can effectively save costs, has good stability, and energy loss is low, and the electric energy conversion rate is high.

1. 
   A power supply circuit, wherein the power supply circuit comprises: an information acquisition module, a power supply circuit unit and a controller, wherein the power supply circuit unit comprises an inductor, a switch, a capacitor, a transformer, an output half-wave rectifier module;

the information acquisition module is used for collecting the information of the input and/or output end of the power supply circuit unit;

the controller is connected with the information acquisition module and the switch, and is used for generating the instruction information that controls the duty cycle and the frequency of the switch according to the information collected by the information acquisition module and the output demand of the load to the power supply circuit, and controls the switch to execute the instruction information.

2. power supply circuit according to claim 1, it is characterized in that, described power supply circuit input voltage maximum $V_{\text{入}}$$V_{\text{入 }}$V_("入 ")V_{\text {入 }} value and input

$30\mathrm{nF}-3\mu \mathrm{F}$$30\mathrm{nF}-3\mu \mathrm{F}$30nF-3muF30 \mathrm{nF}-3 \mu \mathrm{~F} , described transformer primary winding inductance range is $10\mu \mathrm{H}-1000\mu \mathrm{H}$$10\mu \mathrm{H}-1000\mu \mathrm{H}$10 muH-1000 muH10 \mu \mathrm{H}-1000 \mu \mathrm{H} ; Described transformer primary side / secondary side winding ratio range is ${\mathrm{R}}_{\text{原}}{\mathrm{R}}_{\text{副}}=1:5-5:1$${\mathrm{R}}_{\text{原 }}{\mathrm{R}}_{\text{副 }}=1:5-5:1$R_("原 ")R_("副 ")=1:5-5:1\mathrm{R}_{\text {原 }} \mathrm{R}_{\text {副 }}=1: 5-5: 1 .

3. power supply circuit according to claim 2, it is characterized in that, in the ratio of described power supply circuit input voltage maximum value and output voltage maximum value is $V_{\mathrm{入}}:V_{\text{出}}=0.2-1.0$$V_{\mathrm{入}}:V_{\text{出 }}=0.2-1.0$V_(入):V_("出 ")=0.2-1.0V_{入}: V_{\text {出 }}=0.2-1.0 , when output power $200\mathrm{W}-1000\mathrm{W}$$200\mathrm{W}-1000\mathrm{W}$200W-1000W200 \mathrm{~W}-1000 \mathrm{~W} , the inductance range of described transformer primary side winding is $10\mu \mathrm{H}-1000\mu \mathrm{H}$$10\mu \mathrm{H}-1000\mu \mathrm{H}$10 muH-1000 muH10 \mu \mathrm{H}-1000 \mu \mathrm{H} , the parameter range of described capacitance is $100\mathrm{nF}-3\mu \mathrm{F}$$100\mathrm{nF}-3\mu \mathrm{F}$100nF-3muF100 \mathrm{nF}-3 \mu \mathrm{~F} , and described transformer primary side/secondary side winding proportion range is ${\mathrm{R}}_{\text{原}}:{\mathrm{R}}_{\text{副}}=1:5-1:1$${\mathrm{R}}_{\text{原 }}:{\mathrm{R}}_{\text{副 }}=1:5-1:1$R_("原 "):R_("副 ")=1:5-1:1\mathrm{R}_{\text {原 }}: \mathrm{R}_{\text {副 }}=1: 5-1: 1 .

4. power supply circuit according to claim 2, it is characterized in that, when the ratio of described power supply circuit input voltage maximum value and output voltage maximum value is $V_{\lambda }:V_{\text{出}}=5.0-8.0$$V_{\lambda }:V_{\text{出 }}=5.0-8.0$V_(lambda):V_("出 ")=5.0-8.0V_{\lambda}: V_{\text {出 }}=5.0-8.0 , and output power is 1000 W - 2000 W, described transformer primary side inductance range is $50\mu \mathrm{H}-250\mu \mathrm{H}$$50\mu \mathrm{H}-250\mu \mathrm{H}$50 muH-250 muH50 \mu \mathrm{H}-250 \mu \mathrm{H} , described capacitance parameter range is $200\mathrm{nF}-800\mathrm{nF}$$200\mathrm{nF}-800\mathrm{nF}$200nF-800nF200 \mathrm{nF}-800 \mathrm{nF} , described transformer primary side/secondary side winding proportion range is $R_{\text{原}}:R_{\text{副}}=2:1-5:1$$R_{\text{原 }}:R_{\text{副 }}=2:1-5:1$R_("原 "):R_("副 ")=2:1-5:1R_{\text {原 }}: R_{\text {副 }}=2: 1-5: 1 .

5. power supply circuit according to claim 2, it is characterized in that, when described power supply circuit input voltage maximum value and output voltage maximum value ratio is $V_{\lambda }:V_{\text{出}}=0.5-1.5$$V_{\lambda }:V_{\text{出 }}=0.5-1.5$V_(lambda):V_("出 ")=0.5-1.5V_{\lambda}: V_{\text {出 }}=0.5-1.5 , when output power, described transformer primary side inductance range is $30\mu \mathrm{H}-1000\mu \mathrm{H}$$30\mu \mathrm{H}-1000\mu \mathrm{H}$30 muH-1000 muH30 \mu \mathrm{H}-1000 \mu \mathrm{H} , described capacitance parameter range is $50\mathrm{nF}-3\mu \mathrm{F}$$50\mathrm{nF}-3\mu \mathrm{F}$50nF-3muF50 \mathrm{nF}-3 \mu \mathrm{~F} , described transformer primary side/secondary side winding proportion range is ${\mathrm{R}}_{\text{原}}:{\mathrm{R}}_{\text{副}}=1:2-2:1$${\mathrm{R}}_{\text{原 }}:{\mathrm{R}}_{\text{副 }}=1:2-2:1$R_("原 "):R_("副 ")=1:2-2:1\mathrm{R}_{\text {原 }}: \mathrm{R}_{\text {副 }}=1: 2-2: 1 . $1000W-2000W$$1000W-2000W$1000 W-2000 W1000 W-2000 W

6. power supply circuit according to claim 2, it is characterized in that, the ratio of input voltage maximum value and output voltage maximum value of described power supply circuit is $V_{\mathrm{入}}:V_{\text{出}}=2.0-5.0$$V_{\mathrm{入}}:V_{\text{出 }}=2.0-5.0$V_(入):V_("出 ")=2.0-5.0V_{入}: V_{\text {出 }}=2.0-5.0 , and $2000W-10000W$$2000W-10000W$2000 W-10000 W2000 W-10000 W when output power, described transformer primary side inductance range is $50\mu \mathrm{H}-250\mu \mathrm{H}$$50\mu \mathrm{H}-250\mu \mathrm{H}$50 muH-250 muH50 \mu \mathrm{H}-250 \mu \mathrm{H} , described capacitance parameter value range is $200\mathrm{nF}-800\mathrm{nF}$$200\mathrm{nF}-800\mathrm{nF}$200nF-800nF200 \mathrm{nF}-800 \mathrm{nF} , described transformer primary side/secondary side winding proportion range is $R_{\text{原}}:R_{\text{副}}=1:1-2:1$$R_{\text{原 }}:R_{\text{副 }}=1:1-2:1$R_("原 "):R_("副 ")=1:1-2:1R_{\text {原 }}: R_{\text {副 }}=1: 1-2: 1 .

7. The power supply circuit of any one of claims 1 to 6, wherein when the input power supply of the power supply circuit unit is alternating current, the power supply circuit further comprises an input rectifier module that provides a direct current input for the inductor.

8. The power supply circuit of any one of claims 1 to 6, wherein the output half-wave rectification module of the power supply circuit unit realizes half-wave rectification through a diode.

9. The power supply circuit of any one of claims 1 to 6, wherein the output half-wave rectifier module of the power supply circuit unit realizes half-wave rectification through a fifth switch and a fifth controller controlling the fifth switch.

10. The power supply circuit of claim 9, wherein the fifth controller is controlled according to the power supply circuit