KR20190097819A - Smart Turn-onLLC Converter for ZVS(Zero-Voltage-Switching) - Google Patents

Abstract

The present invention relates to a smart turn-on type LLC converter for zero voltage switching, which has the increased efficiency. The smart turn-on type LLC converter comprises: a half-bridge switch (203); a transformer primary winding (206-1); a rectifying unit; a load; first and second voltage-dividing resistors (145, 146); a control unit (150); a current-continuity and current-discontinuity detection (CCM/DCM detection) comparator (141); a current comparator (171); a smart turn-on comparator (177); a first AND gate (183); a second AND gate (174); a D flip-flop (175); a delay circuit (176); and an RS flip-flop (173).

Description

Smart Turn-on LLC Converter for Zero Voltage Switching {Smart Turn-on LLC Converter for Zero-Voltage-Switching}

The present invention relates to an LLC converter of a smart turn-on method for zero voltage switching in an LLC resonant converter, which is the most popular type of resonant converter. Above all, current information of primary side or secondary side current sensor of LLC resonant converter, voltage information of output voltage with first and second voltage divider resistance and transformer switch current continuous from current continuous and current discontinuous detection unit (CCM / DCM detection unit) (CCM) The present invention relates to a converter capable of smartly switching zero voltage by detecting information of continuous current mode (DCM) and discontinuous current mode (DCM).

LLC resonant converters are the most popular power supplies in recent years. Above all, there are advantages of stable zero voltage switching [ZVS (Zero-Voltage-Switching)] due to resonance of leakage inductor (Llk)-magnetizing inductor (Lm)-resonant capacitor. And application.

In related prior documents, Korean Unexamined Patent Publication No. 10-2018-0004655, published on Jan. 12, 2018 (hereinafter referred to as [Patent Document 1]) discloses a hybrid full bridge LLC converter and a driving method thereof. [Patent Document 1] is a converter that performs a full-leaf conversion between the input capacitor and the battery for supplying the input voltage, the input terminal of the first and second transformers in the first and second full bridge LLC converter is connected in parallel and the first, The output of the two transformers is characterized in that connected in series.

As another prior document, Korean Unexamined Patent Publication No. 10-2018-0003122, Publication No. 2018.01.09. (Hereinafter referred to as [Patent Document 2]) has proposed an interleaved LLC resonant converter and its control method. [Patent Document 2] discloses a resonant converter and a control method thereof in which an LLC resonant converter composed of a full bridge circuit is operated in N parallel and supplies power to a load.

In addition, Republic of Korea Patent Publication No. 10-1304777, Publication No. 2013. 09. 05. (hereinafter referred to as "Patent Document 1") has disclosed a DC-DC converter having a wide input voltage control range. In [Patent Document 1], a stable output in a wide input voltage range by combining an interleaved flyback converter and an LLC resonant converter in order to transfer electrical energy generated from a solar cell having a wide input range to a load. A DC-DC converter for generating a voltage is disclosed.

However, in [Patent Documents 1] to [Patent Documents 3], the LLC resonant converter has been proposed, but there is a problem that the zero voltage switching range due to the variable load cannot be extended.

[Patent Document 1] Republic of Korea Patent Publication No. 10-2018-0004655, Publication Date 2018.01.12. [Patent Document 2] Republic of Korea Patent Publication No. 10-2018-0003122, Publication Date 2018.01.09. [Patent Document 3] Korean Patent Publication No. 10-1304777, Publication Date 2013. 09. 05.

In the present invention, the current information of the primary or secondary side current sensor, the voltage information of the output voltage as the first and second voltage divider in the LLC converter in which the leakage inductor Llk-magnetization inductor Lm-resonant capacitor resonates in the transformer Smart turn-on driver 160 detects information of transformer switch current continuous (CCM) and current discontinuous (DCM) from current continuous and current discontinuity detectors (CCM / DCM detector) Through this, we propose a converter that performs zero-voltage switching.

In order to solve the problem, (1) the voltage information of the output voltage is detected from the first and second voltage divider resistors, and the output voltage is controlled using the output voltage controller 150. Current information of the primary or secondary side current sensor is detected to control the current using the current controller 170, and (3) the main switch is heavy-loaded using the smart turn-on driver 160. The solution of the problem is to perform zero-voltage switching at light load as well as heavy load.

In the present invention, through the smart turn-on LLC converter for zero voltage switching, firstly, the load is stably carried out at light load as well as heavy load, thereby increasing efficiency. Second, there is an increased effect of always performing zero voltage switching by detecting information of a continuous current mode (CCM) and a discontinuous current mode (DCM) flowing through the main switch.

1 is a conventional general LED power supply
2 is an input power factor improvement converter of an average current control method.
Figure 3 is an input power factor improvement converter of the peak current control method
4 is a LLC converter of a forward rectifying method
5 is a LLC converter of a full-bridge rectification method
6 is a LLC converter of a voltage-doubler rectification method.
7 is a detailed circuit of the LLC converter of the proposed forward rectification method (first embodiment).
8 is a detailed circuit of a LLC converter of the proposed forward rectification method (second embodiment)
9 is a detailed circuit of the proposed full-bridge rectification LLC converter (first embodiment)
10 is a detailed circuit of the proposed full-bridge rectification LLC converter (second embodiment)
11 is a detailed circuit of the LLC converter of the proposed voltage-doubler rectification method (first embodiment).
12 is a detailed circuit of a LLC converter of the proposed voltage-doubler rectification method (second embodiment)
13 shows the main waveform of the proposed LLC converter
14 is a first voltage controller form
15 is a second voltage controller form

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 shows a conventional general LED power supply.

Represents the conventional general LED power supply. The AC power supply 10 is rectified through the input rectifier diode 20, and generally supplies power to the LED group 300 by the power factor improving converter 100 and the DC-DC converter 120. to be.

The power factor improving converter 100 may include a first current sensor 41 and a second current sensor 42 that detects a current inside the power factor improving converter 100 at an input terminal, and the power factor improving converter 100 may be provided at the input terminal. The power factor improving converter control unit 103 controls the switch of the power factor improving converter unit 100 based on current and voltage information from the first and second voltage divider resistors 109 and 110.

In addition, the output voltage and current information of the DC-DC converter 120 is detected from the third and fourth voltage divider resistors 129 and 130 and the third current sensor 43 at the output terminal of the DC-DC converter 120. The switch of the DC-DC converter 120 is controlled through the DC-DC converter controller 123.

2 shows an input power factor improving converter of an average current control method. In the average current control method, current information is detected by a second current sensor 42 that detects a current flowing through the first current sensor 41 and a ground terminal of the power factor improving converter 100 at an input terminal and detects an output voltage. The output voltage is detected from the first and second voltage divider resistors Rd1 and Rd2, and the input current Ii is obtained by using the first voltage error comparator 54, the multiplier 53, and the first current error comparator 51. It is a power factor improvement method of controlling the average current Iave to the current IL.

3 shows an input power factor improving converter of a peak current control method. In the peak current control method, current information is detected by a second current sensor 42 that detects a current flowing in a lower portion of the power factor improving switch 32 of the first power sensor 41 and the power factor improving converter 100 at an input terminal, The output voltage is detected from the first and second voltage divider resistors Rd1 and Rd2 for detecting the output voltage, and the input current is measured using the second voltage error comparator 64, the multiplier 63, and the second current error comparator 61. It is a power factor improvement method of controlling (Ii) to follow the peak value to the inductor current IL.

4 shows an LLC converter of a forward rectifying method.

The forward rectifying LLC converter has a resonant capacitor 205-a leakage inductor (Llk) 207-a transformer primary winding (206-) at both ends of the lower switch (203-3) of the half-bridge switch (203). The inductor of 1) resonates and supplies electrical energy to the LED group 300 through the forward type rectifier 310.

5 shows an LLC converter of a full-bridge rectification method.

The full-bridge rectifier LLC converter includes a resonant capacitor 205-a leakage inductor (Llk) 207-a transformer primary winding at both ends of the lower switch 203-3 of the half-bridge switch 203. An inductor 206-1 resonates and supplies electrical energy to the LED group 300 through the full bridge type rectifier 320.

6 shows an LLC converter of a voltage-doubler rectification method.

The LLC converter of the voltage-doubler rectification type includes a resonant capacitor 205-a leakage inductor (Llk) 207-a transformer primary winding at both ends of the lower switch 203-3 of the half bridge switch 203. The inductor 206-1 resonates and supplies electrical energy to the LED group 300 through the double voltage type rectifier 330.

7 shows a detailed circuit (first embodiment) of the LLC converter of the proposed forward rectification method.

The proposed forward rectifier LLC converter includes a resonant capacitor 205-a leakage inductor (Llk) 207-a transformer primary side winding at both ends of the lower switch 203-3 of the half bridge switch 203. The inductor 206-1 resonates and supplies electrical energy to the LED group 300 through the forward type rectifier 310.

First of all, the main switch receives the voltage information of the output voltage from the first and second voltage divider resistors 145 and 146 for zero-voltage switching under heavy load as well as light load. The output voltage is controlled using the output voltage controller 150.

Above all, the output voltage controller 150 amplifies the error at a ratio of the first voltage control gain Z1 and the second voltage control gain Z2, and outputs the output voltage Ve of the voltage error comparator. In addition, a current flows continuously through the lower switch 203-3 through a current continuous and current discontinuity detection (CCM / DCM detection) comparator 141 connected to the transformer tertiary winding 206-3 (continuous current mode (CCM)). Otherwise, the current detects information of discontinuous current mode (DCM). The output of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 (a signal at point A) is input to the second AND gate 174 of the smart turn-on driver 160.

In addition, the smart turn-on driver through the current detection resistor (Rs) 172 and the current comparator 171 based on the current information detected by the primary side current sensor 143 of the proposed forward rectification LLC converter. Input to RS flip-flop 173 of 160.

The output of the RS flip-flop 173 is input to the lower switch gate signal Vg1 to the first NOT gate 183-1 of the first AND gate 183. In addition, the first and second resistors 178 and 179 are input to the (+) terminal of the smart turn-on comparator 177, and the output voltage Ve of the voltage error comparator of the output voltage controller 150 is the smart turn-on comparator. The negative terminal of (177) is input.

The output of the smart turn-on comparator 177 and the lower switch gate signal Vg1 input to the first NOT gate 183-1 of the first AND gate 183 are input to the first AND gate 183. The output of the first AND gate 183 (signal B point) is input to the second NOT gate 174-1 of the second AND gate 174.

The output (signal at point A) of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 is input to the second NOT gate 174-1 of the second AND gate 174, and the first An output (signal B point) of the AND gate 183 generates an output (signal C point) through the second AND gate 174. The output (signal C point) through the second AND gate 174 generates an output (signal D point) of the D flip-flop 175. The output of the D flip-flop 175 (signal of point D) generates an output (signal of point E) through a delay circuit 176.

The output of the current comparator 171 and the output of the delay circuit 176 (the signal at the point E) finally generate the lower switch gate signal Vg1 through the RS flip-flop 173.

In addition, the lower switch gate signal Vg1 configures the lower switch 203-3 through a buffer 191 of the gate driver 190, and the lower switch gate signal Vg1 is the gate driver 190. It is a technical feature to drive the upper switch (203-1) through an inverter (Inverter) (192).

8 shows a detailed circuit (second embodiment) of the LLC converter of the proposed forward rectification method.

The proposed forward rectifier LLC converter includes a resonant capacitor 205-a leakage inductor (Llk) 207-a transformer primary side winding at both ends of the lower switch 203-3 of the half bridge switch 203. The inductor 206-1 resonates and supplies electrical energy to the LED group 300 through the forward type rectifier 310.

First of all, the main switch receives the voltage information of the output voltage from the first and second voltage divider resistors 145 and 146 for zero-voltage switching under heavy load as well as light load. The output voltage is controlled using the output voltage controller 150.

Above all, the output voltage controller 150 amplifies the error at a ratio of the first voltage control gain Z1 and the second voltage control gain Z2, and outputs the output voltage Ve of the voltage error comparator. In addition, a current flows continuously through the lower switch 203-3 through a current continuous and current discontinuity detection (CCM / DCM detection) comparator 141 connected to the transformer tertiary winding 206-3 (continuous current mode (CCM)) Otherwise, the current detects information of discontinuous current mode (DCM). The output of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 (a signal at point A) is input to the second AND gate 174 of the smart turn-on driver 160.

In addition, the smart turn-on driver through the current detection resistor (Rs) 172 and the current comparator 171 based on the current information detected by the secondary side current sensor 144 of the proposed forward rectification LLC converter. Input to RS flip-flop 173 of 160.

The output of the RS flip-flop 173 is input to the lower switch gate signal Vg1 to the first NOT gate 183-1 of the first AND gate 183. In addition, the first and second resistors 178 and 179 are input to the (+) terminal of the smart turn-on comparator 177, and the output voltage Ve of the voltage error comparator of the output voltage controller 150 is the smart turn-on comparator. The negative terminal of (177) is input.

The output of the smart turn-on comparator 177 and the lower switch gate signal Vg1 input to the first NOT gate 183-1 of the first AND gate 183 are input to the first AND gate 183. The output of the first AND gate 183 (signal B point) is input to the second NOT gate 174-1 of the second AND gate 174.

The output (signal at point A) of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 is input to the second NOT gate 174-1 of the second AND gate 174, and the first An output (signal B point) of the AND gate 183 generates an output (signal C point) through the second AND gate 174. The output (signal C point) through the second AND gate 174 generates an output (signal D point) of the D flip-flop 175. The output of the D flip-flop 175 (signal of point D) generates an output (signal of point E) through a delay circuit 176.

The output of the current comparator 171 and the output of the delay circuit 176 (the signal at the point E) finally generate the lower switch gate signal Vg1 through the RS flip-flop 173.

In addition, the lower switch gate signal Vg1 configures the lower switch 203-3 through a buffer 191 of the gate driver 190, and the lower switch gate signal Vg1 is the gate driver 190. It is a technical feature to drive the upper switch (203-1) through an inverter (Inverter) (192).

9 shows a detailed circuit (first embodiment) of an LLC converter of a proposed full-bridge rectification method.

The full-bridge rectifier LLC converter includes a resonant capacitor 205-a leakage inductor (Llk) 207-a transformer primary winding at both ends of the lower switch 203-3 of the half-bridge switch 203. An inductor 206-1 resonates and supplies electrical energy to the LED group 300 through the full bridge type rectifier 320.

First of all, the main switch receives the voltage information of the output voltage from the first and second voltage divider resistors 145 and 146 for zero-voltage switching under heavy load as well as light load. The output voltage is controlled using the output voltage controller 150.

Above all, the output voltage controller 150 amplifies the error at a ratio of the first voltage control gain Z1 and the second voltage control gain Z2, and outputs the output voltage Ve of the voltage error comparator. In addition, a current flows continuously through the lower switch 203-3 through a current continuous and current discontinuity detection (CCM / DCM detection) comparator 141 connected to the transformer tertiary winding 206-3 (continuous current mode (CCM)). Otherwise, the current detects information of discontinuous current mode (DCM). The output of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 (a signal at point A) is input to the second AND gate 174 of the smart turn-on driver 160.

In addition, the smart turn-on driver through the current detection resistor (Rs) 172 and the current comparator 171 based on the current information detected by the primary side current sensor 143 of the proposed forward rectification LLC converter. Input to RS flip-flop 173 of 160.

The output of the RS flip-flop 173 is input to the lower switch gate signal Vg1 to the first NOT gate 183-1 of the first AND gate 183. In addition, the first and second resistors 178 and 179 are input to the (+) terminal of the smart turn-on comparator 177, and the output voltage Ve of the voltage error comparator of the output voltage controller 150 is the smart turn-on comparator. The negative terminal of (177) is input.

The output of the smart turn-on comparator 177 and the lower switch gate signal Vg1 input to the first NOT gate 183-1 of the first AND gate 183 are input to the first AND gate 183. The output of the first AND gate 183 (signal B point) is input to the second NOT gate 174-1 of the second AND gate 174.

The output (signal at point A) of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 is input to the second NOT gate 174-1 of the second AND gate 174, and the first An output (signal B point) of the AND gate 183 generates an output (signal C point) through the second AND gate 174. The output (signal C point) through the second AND gate 174 generates an output (signal D point) of the D flip-flop 175. The output of the D flip-flop 175 (signal of point D) generates an output (signal of point E) through a delay circuit 176.

The output of the current comparator 171 and the output of the delay circuit 176 (the signal at the point E) finally generate the lower switch gate signal Vg1 through the RS flip-flop 173.

In addition, the lower switch gate signal Vg1 configures the lower switch 203-3 through a buffer 191 of the gate driver 190, and the lower switch gate signal Vg1 is the gate driver 190. It is a technical feature to drive the upper switch (203-1) through an inverter (Inverter) (192).

10 shows a detailed circuit (second embodiment) of the proposed full-bridge rectification LLC converter.

The full-bridge rectifier LLC converter includes a resonant capacitor 205-a leakage inductor (Llk) 207-a transformer primary winding at both ends of the lower switch 203-3 of the half-bridge switch 203. An inductor 206-1 resonates and supplies electrical energy to the LED group 300 through the full bridge type rectifier 320.

First of all, the main switch receives the voltage information of the output voltage from the first and second voltage divider resistors 145 and 146 for zero-voltage switching under heavy load as well as light load. The output voltage is controlled using the output voltage controller 150.

Above all, the output voltage controller 150 amplifies the error at a ratio of the first voltage control gain Z1 and the second voltage control gain Z2, and outputs the output voltage Ve of the voltage error comparator. In addition, a current flows continuously through the lower switch 203-3 through a current continuous and current discontinuity detection (CCM / DCM detection) comparator 141 connected to the transformer tertiary winding 206-3 (continuous current mode (CCM)). Otherwise, the current detects information of discontinuous current mode (DCM). The output of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 (a signal at point A) is input to the second AND gate 174 of the smart turn-on driver 160.

In addition, the smart turn-on driver through the current detection resistor (Rs) 172 and the current comparator 171 based on the current information detected by the secondary side current sensor 144 of the proposed forward rectification LLC converter. Input to RS flip-flop 173 of 160.

The output of the RS flip-flop 173 is input to the lower switch gate signal Vg1 to the first NOT gate 183-1 of the first AND gate 183. In addition, the first and second resistors 178 and 179 are input to the (+) terminal of the smart turn-on comparator 177, and the output voltage Ve of the voltage error comparator of the output voltage controller 150 is the smart turn-on comparator. The negative terminal of (177) is input.

The output of the smart turn-on comparator 177 and the lower switch gate signal Vg1 input to the first NOT gate 183-1 of the first AND gate 183 are input to the first AND gate 183. The output of the first AND gate 183 (signal B point) is input to the second NOT gate 174-1 of the second AND gate 174.

The output (signal at point A) of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 is input to the second NOT gate 174-1 of the second AND gate 174, and the first An output (signal B point) of the AND gate 183 generates an output (signal C point) through the second AND gate 174. The output (signal C point) through the second AND gate 174 generates an output (signal D point) of the D flip-flop 175. The output of the D flip-flop 175 (signal of point D) generates an output (signal of point E) through a delay circuit 176.

The output of the current comparator 171 and the output of the delay circuit 176 (the signal at the point E) finally generate the lower switch gate signal Vg1 through the RS flip-flop 173.

In addition, the lower switch gate signal Vg1 configures the lower switch 203-3 through a buffer 191 of the gate driver 190, and the lower switch gate signal Vg1 is the gate driver 190. It is a technical feature to drive the upper switch (203-1) through an inverter (Inverter) (192).

11 shows a detailed circuit (first embodiment) of the LLC converter of the proposed voltage-doubler rectification method.

The LLC converter of the voltage-doubler rectification type includes a resonant capacitor 205-a leakage inductor (Llk) 207-a transformer primary winding at both ends of the lower switch 203-3 of the half bridge switch 203. The inductor 206-1 resonates and supplies electrical energy to the LED group 300 through the double voltage type rectifier 330.

First of all, the main switch receives the voltage information of the output voltage from the first and second voltage divider resistors 145 and 146 for zero-voltage switching under heavy load as well as light load. The output voltage is controlled using the output voltage controller 150.

Above all, the output voltage controller 150 amplifies the error at a ratio of the first voltage control gain Z1 and the second voltage control gain Z2, and outputs the output voltage Ve of the voltage error comparator. In addition, a current flows continuously through the lower switch 203-3 through a current continuous and current discontinuity detection (CCM / DCM detection) comparator 141 connected to the transformer tertiary winding 206-3 (continuous current mode (CCM)). Otherwise, the current detects information of discontinuous current mode (DCM). The output of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 (a signal at point A) is input to the second AND gate 174 of the smart turn-on driver 160.

In addition, the smart turn-on driver through the current detection resistor (Rs) 172 and the current comparator 171 based on the current information detected by the primary side current sensor 143 of the proposed forward rectification LLC converter. Input to RS flip-flop 173 of 160.

The output of the RS flip-flop 173 is input to the lower switch gate signal Vg1 to the first NOT gate 183-1 of the first AND gate 183. In addition, the first and second resistors 178 and 179 are input to the (+) terminal of the smart turn-on comparator 177, and the output voltage Ve of the voltage error comparator of the output voltage controller 150 is the smart turn-on comparator. The negative terminal of (177) is input.

The output of the smart turn-on comparator 177 and the lower switch gate signal Vg1 input to the first NOT gate 183-1 of the first AND gate 183 are input to the first AND gate 183. The output of the first AND gate 183 (signal B point) is input to the second NOT gate 174-1 of the second AND gate 174.

The output (signal at point A) of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 is input to the second NOT gate 174-1 of the second AND gate 174, and the first An output (signal B point) of the AND gate 183 generates an output (signal C point) through the second AND gate 174. The output (signal C point) through the second AND gate 174 generates an output (signal D point) of the D flip-flop 175. The output of the D flip-flop 175 (signal of point D) generates an output (signal of point E) through a delay circuit 176.

The output of the current comparator 171 and the output of the delay circuit 176 (the signal at the point E) finally generate the lower switch gate signal Vg1 through the RS flip-flop 173.

In addition, the lower switch gate signal Vg1 configures the lower switch 203-3 through a buffer 191 of the gate driver 190, and the lower switch gate signal Vg1 is the gate driver 190. It is a technical feature to drive the upper switch (203-1) through an inverter (Inverter) (192).

12 shows a detailed circuit (second embodiment) of the LLC converter of the proposed voltage-doubler rectification method.

The LLC converter of the voltage-doubler rectification type includes a resonant capacitor 205-a leakage inductor (Llk) 207-a transformer primary winding at both ends of the lower switch 203-3 of the half bridge switch 203. The inductor 206-1 resonates and supplies electrical energy to the LED group 300 through the double voltage type rectifier 330.

First of all, the main switch receives the voltage information of the output voltage from the first and second voltage divider resistors 145 and 146 for zero-voltage switching under heavy load as well as light load. The output voltage is controlled using the output voltage controller 150.

Above all, the output voltage controller 150 amplifies the error at a ratio of the first voltage control gain Z1 and the second voltage control gain Z2, and outputs the output voltage Ve of the voltage error comparator. In addition, a current flows continuously through the lower switch 203-3 through a current continuous and current discontinuity detection (CCM / DCM detection) comparator 141 connected to the transformer tertiary winding 206-3 (continuous current mode (CCM)). Otherwise, the current detects information of discontinuous current mode (DCM). The output of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 (a signal at point A) is input to the second AND gate 174 of the smart turn-on driver 160.

In addition, the smart turn-on driver through the current detection resistor (Rs) 172 and the current comparator 171 based on the current information detected by the secondary side current sensor 144 of the proposed forward rectification LLC converter. Input to RS flip-flop 173 of 160.

The output of the RS flip-flop 173 is input to the lower switch gate signal Vg1 to the first NOT gate 183-1 of the first AND gate 183. In addition, the first and second resistors 178 and 179 are input to the (+) terminal of the smart turn-on comparator 177, and the output voltage Ve of the voltage error comparator of the output voltage controller 150 is the smart turn-on comparator. The negative terminal of (177) is input.

The output of the smart turn-on comparator 177 and the lower switch gate signal Vg1 input to the first NOT gate 183-1 of the first AND gate 183 are input to the first AND gate 183. The output of the first AND gate 183 (signal B point) is input to the second NOT gate 174-1 of the second AND gate 174.

The output (signal at point A) of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 is input to the second NOT gate 174-1 of the second AND gate 174, and the first An output (signal B point) of the AND gate 183 generates an output (signal C point) through the second AND gate 174. The output (signal C point) through the second AND gate 174 generates an output (signal D point) of the D flip-flop 175. The output of the D flip-flop 175 (signal of point D) generates an output (signal of point E) through a delay circuit 176.

The output of the current comparator 171 and the output of the delay circuit 176 (the signal at the point E) finally generate the lower switch gate signal Vg1 through the RS flip-flop 173.

In addition, the lower switch gate signal Vg1 configures the lower switch 203-3 through a buffer 191 of the gate driver 190, and the lower switch gate signal Vg1 is the gate driver 190. It is a technical feature to drive the upper switch (203-1) through an inverter (Inverter) (192).

13 shows the main waveforms of the proposed LLC converter.

 -Signal at point A: output of current continuous and current discontinuous detection (CCM / DCM detection) comparator 141

 -Signal at point B: output of first AND gate 183

 Signal at point C: output through second AND gate 174

 -D point signal: output of flip-flop 175

 -E point signal: output through the delay circuit (176)

The signal at point A is generated in a discontinuous current mode (DCM: Discontinuous Current Mode) of the lower switch 203-3, and in particular, the voltage VDS of the lower switch 203-3 is input. A signal is generated below the voltage Vin, and finally, the signal at the point E is a time point when the lower switch 203-3 is turned on.

First of all, when the current flows in the lower switch 203-3 with a negative current, the lower switch 203-3 turns on. Since the lower switch 203-3 turns on when a current flows through the antiparallel diode 203-4 of the lower switch 203-3, the drain of the lower switch 203-3 is drained. The biggest technical feature is that zero voltage switching (ZVS) is always stable because the potential between the source and source is zero.

FIG. 14 shows the form of the first voltage controller, and FIG. 15 shows the form of the second voltage controller.

In the first voltage controller (FIG. 14), a first control gain Z1 is connected to a first control resistor R1 and a first capacitor C1 in parallel, and the first control resistor R1 and the first capacitor are connected in parallel. The second control resistor R2 is configured in series with C1, and the second control gain Z2 is configured by connecting the eleventh control resistor R11 and the eleventh control capacitor C11 in series. do.

In the second voltage controller (FIG. 15), a first control gain Z1 includes a second control resistor R2 and a first capacitor C1 in parallel with the first control resistor R1, and a second control gain. Z2 includes an eleventh control resistor R11 and an eleventh control capacitor C11 connected in series, and a twelfth control capacitor C12 in parallel with the eleventh control resistor R11 and the eleventh control capacitor C11. ) Is arranged and configured.

Therefore, a smart turn-on LLC converter for zero voltage switching, comprising: a half bridge switch 203 composed of an upper switch 203-1 and a lower switch 203-3; A transformer primary side winding 206-1 connected to the half bridge switch 203; A rectifier connected to the transformer secondary winding 206-2; A load receiving the power output from the rectifier 310; First and second voltage divider resistors 145 and 146 for detecting an output voltage of the load; An output voltage controller 150 for detecting voltage information of an output voltage from the first and second voltage divider resistors 145 and 146 to control an output voltage; Current continuous and connected to the transformer tertiary winding 206-3 which detects information of continuous current mode (CCM) or discontinuous current mode (DCM) of the lower switch 203-3. Current discontinuity detection (CCM / DCM detection) comparator 141; A current comparator 171 to which current information detected by primary or secondary side current sensors 143 and 144 of the LLC converter and an output Ve of the output voltage controller 150 are input; A smart turn-on comparator 177 to which a gate signal Vg1 of the lower switch 203-3 and an output Ve of the output voltage controller 150 are input; A first AND gate 183 to which the output of the smart turn-on comparator 177 and the gate signal Vg1 of the lower switch 203-3 are inverted and inputted; A second AND gate 174 to which the output of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 and the output signal of the first AND gate 183 are inverted and inputted; A D flip-flop 175 to which an output of the second AND gate 174 is input; A delay circuit 176 for delaying an output of the D flip-flop 175; An RS flip-flop (173) configured to receive the output of the current comparator (171) and the output of the delay circuit (176) to generate a gate signal (Vg1) of the lower switch (203-3); When the current flows through the antiparallel diode of the half-bridge switch 203, the upper switch 203-1 or the lower switch 203-3 is turned on in a zero voltage switching state. We propose a smart turn-on LLC converter for zero voltage switching.

The present invention can be applied to a smart turn-on LLC converter for zero voltage switching by a person skilled in the art by various modifications, the scope of the technology that can be easily technically modified within the scope of the patent You will have to admit that.

10: AC power source (Vac)
20: input rectifier diode
31: power factor improvement inductor
32: power factor improvement switch
33 power factor improving diode
34: output capacitor of power factor improving converter
41: first current sensor
42: second current sensor
43: third current sensor
44: Bank Capacitor
50: average current controller
51: first current error comparator
52: Comparator for Gate Signal Generation of Power Factor Correction Converter
53: multiplier
54: first voltage error comparator
55: current detection gain of the first current sensor (1 / K)
56: current detection gain (Rs) of the first current sensor
60: peak current controller
61: second current error comparator
62: RS flip flop
63: multiplier
64: second voltage error comparator
65: current detection gain of the first current sensor (1 / K)
100: power factor improvement converter
101: power factor converter converter power circuit
102: power factor improvement converter gate drive circuit
103: power factor improvement converter control unit
104: gate signal generator of the power factor improving converter
105: output voltage detector of the power factor improving converter
106: first current detection unit
107: second current detection unit
109: first voltage divider resistance
110: second voltage divider resistance
120: DC-DC converter section
121: DC-DC converter power circuit unit
122: DC-DC converter gate driving circuit
123: DC-DC converter control unit
124: gate signal generator of the DC-DC converter
125: output voltage detector of the DC-DC converter
126: third current detection unit
129: third voltage divider resistance
130: fourth voltage divider resistance
140: current continuous and current discontinuous detection unit (CCM / DCM detection unit)
141: current continuous and current discontinuous detection (CCM / DCM detection) comparator
143: Primary current sensor
144: secondary current sensor
145: first voltage divider resistance
146: second voltage divider resistance
150: output voltage control unit
151: output voltage comparator
160: Smart turn on driving unit
170: current control unit
171: current comparator
172: current detection resistance (Rs)
173: RS flip-flop
174: second AND gate
174-1: second NOT gate
175: D flip flop
176: delay circuit
177: Smart Turn-On Comparator
178: first resistance
179: second resistance
180: control diode
181: Zener Diodes
183: first AND gate
183-1: First NOT gate
190: gate driver
191: Buffer
192: Inverter
203: half bridge switch
203-1: Upper switch
203-2: anti-parallel diode of the upper switch
203-3: Lower switch
203-4: anti-parallel diode of lower switch
205: resonant capacitor
206: Transformer
206-1: primary winding of transformer
206-2: Transformer secondary winding
206-3: Transformer third winding
207: Leakage inductor (Llk)
300: LED Group
301: first LED group
302: second LED group
303: third LED group
310: forward type rectifier
311: first rectifier diode of forward type rectifier
312: second rectifier diode of the forward rectifier
313: output inductor of the forward type rectifier
314: output capacitor of the forward type rectifier
320: full bridge type rectifier
321: First rectifier diode of full bridge type rectifier
322: second rectifier diode of the full-bridge type rectifier
323: third rectifier diode of full-bridge type rectifier
324: fourth rectifier diode of full-bridge type rectifier
325: output capacitor of the full bridge rectifier
330: double voltage type rectifier
331: First rectifier diode of double voltage type rectifier
332: second rectifier diode of double voltage type rectifier
333: First output capacitor of the double voltage type rectifier
334: second output capacitor of the double voltage type rectifier
A: signal of A point
B: Signal of B point
C: signal at point C
D: Signal of D point
E: Signal of E point
C1: first control capacitor
C11: 11th control capacitor
C12: 12th control capacitor
Iave: Average Current
Ii: input current
IL: Current of power factor improving inductor
iref: reference current
isw: first switch current
isec: rectifier diode
PWM: pulse width modulated signal
R1: first control resistor
R2: second control resistor
R11: eleventh control resistor
Rd1: first voltage divider resistance
Rd2: second voltage divider resistance
t: time
t0: time 0
t1: first time
t2: second time
t3: third time
t4: fourth time
t5: fifth time
t6: the sixth time
TD: time delay
TOFF: Off time
TOFFmin: Minimum Off Time
TON: On time
Vcc: Control Voltage
VDS: Voltage across switch
Vea: Output voltage of voltage error comparator
Vg1: lower switch gate signal
Vg2: top switch gate signal
Vin: Input Voltage
Vo: Output voltage
Vref: reference voltage
Z1: First voltage control gain
Z2: Second voltage control gain
Z11: first current control gain
Z22: Second Current Control Gain

Claims (4)

In a smart turn-on LLC converter for zero voltage switching,
A half bridge switch 203 composed of an upper switch 203-1 and a lower switch 203-3;
A transformer primary side winding 206-1 connected to the half bridge switch 203;
A rectifier connected to the transformer secondary winding 206-2;
A load receiving the power output from the rectifier 310;
First and second voltage divider resistors 145 and 146 for detecting an output voltage of the load;
An output voltage controller 150 for detecting voltage information of an output voltage from the first and second voltage divider resistors 145 and 146 to control an output voltage;
Current continuous and connected to the transformer tertiary winding 206-3 which detects information of continuous current mode (CCM) or discontinuous current mode (DCM) of the lower switch 203-3. Current discontinuity detection (CCM / DCM detection) comparator 141;
A current comparator 171 to which current information detected by primary or secondary side current sensors 143 and 144 of the LLC converter and an output Ve of the output voltage controller 150 are input;
A smart turn-on comparator 177 to which a gate signal Vg1 of the lower switch 203-3 and an output Ve of the output voltage controller 150 are input;
A first AND gate 183 to which the output of the smart turn-on comparator 177 and the gate signal Vg1 of the lower switch 203-3 are inverted and inputted;
A second AND gate 174 to which the output of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 and the output signal of the first AND gate 183 are inverted and inputted;
A D flip-flop 175 to which an output of the second AND gate 174 is input;
A delay circuit 176 for delaying an output of the D flip-flop 175;
An RS flip-flop (173) configured to receive the output of the current comparator (171) and the output of the delay circuit (176) to generate a gate signal (Vg1) of the lower switch (203-3);
When the current flows through the antiparallel diode of the half-bridge switch 203, the upper switch 203-1 or the lower switch 203-3 is turned on in a zero voltage switching state. Smart Turn-On LLC Converter for Zero-Voltage Switching In a smart turn-on LLC converter for zero voltage switching,
A half bridge switch 203 composed of an upper switch 203-1 and a lower switch 203-3;
An output voltage controller 150 for detecting the voltage information of the output voltage from the first and second voltage divider resistors 145 and 146 to control the output voltage;
Current continuous and connected to the transformer tertiary winding 206-3 which detects information of continuous current mode (CCM) or discontinuous current mode (DCM) of the lower switch 203-3. Current discontinuity detection (CCM / DCM detection) comparator 141;
A current comparator 171 to which current information detected by primary or secondary side current sensors 143 and 144 of the LLC converter and an output Ve of the output voltage controller 150 are input;
A smart turn-on comparator 177 to which a gate signal Vg1 of the lower switch 203-3 and an output Ve of the output voltage controller 150 are input;
A first AND gate 183 to which the output of the smart turn-on comparator 177 and the gate signal Vg1 of the lower switch 203-3 are inverted and inputted;
A second AND gate 174 to which the output of the current continuous and current discontinuous detection (CCM / DCM detection) comparator 141 and the output signal of the first AND gate 183 are inverted and inputted;
Smart turn-on LLC converter for zero voltage switching, characterized in that it comprises a D flip-flop 175 to which the output of the second AND gate 174 is input The method according to claim 1 or 2,
Smart turn-on LLC converter for zero voltage switching, characterized in that the load (Load) is a group LED (300) The method according to claim 1 or 2,
The (+) input terminal of the smart turn-on comparator 177 is a smart turn-on LLC converter for zero voltage switching, characterized in that the control diode 180 and the zener diode 181 is connected.

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