CN103368401A - Power supply conversion device with control switch - Google Patents

Abstract

The invention relates to a power conversion device with a control switch, which includes a transformer module, a control switch, a power input unit, a diode circuit, a capacitor circuit and a power output unit. The transformer module includes two independent core transformers, and the control switch includes a first transistor switch and a second transistor switch that are electrically connected to the primary side of the transformer module. The power conversion device with a control switch provided by the present invention can utilize the staggered or simultaneous conduction of the first transistor switch and the second transistor switch when the power input unit provides power from the primary side, so that the diode circuit and the capacitor circuit are turned on accordingly. Actuate, thereby causing the power output unit electrically connected to the secondary side of the transformer module to obtain an output voltage higher than the voltage of the power input unit, with high voltage gain, leakage inductance energy recovery and low input current ripple.

Description

Power conversion device with control switch

technical field

The invention relates to a conversion device, in particular to a power conversion device with a control switch.

Background technique

The traditional boost converter is a power converter whose output voltage is higher than the input voltage. When the output voltage gain is low, the circuit can achieve high conversion efficiency; conversely, when the output voltage gain is high, the circuit The parasitic elements will increase the circuit loss and reduce the conversion efficiency.

Flyback converters can obtain high voltage gain through the ratio of turns between the primary side and the secondary side. Therefore, in order to increase the voltage gain, the number of turns of the secondary side winding must be increased, which increases the leakage inductance and copper loss of the transformer. When the power switch is turned off, because the leakage inductance of the transformer will generate a voltage spike (Spike) between the drain (Drain) and the source (Source) of the power switch, which will cause circuit losses, it must also be selected to be high. Voltage-resistant power switch. In order to overcome the voltage surge caused by the leakage inductance, the snubber circuit (Snubber Circuit) design will be the focus of the flyback converter, and the snubber circuit will cause some conversion losses due to resistance.

Contents of the invention

In view of this, the object of the present invention is to provide a power conversion device with a control switch.

In order to achieve the above object, the present invention provides a power conversion device with a control switch, and the power conversion device with a control switch includes:

A transformer module, which has a primary side and a secondary side corresponding to the primary side, the primary side includes a first winding coil and a second winding coil, the first winding coil has a first end and a second end, the second winding coil has a third end and a fourth end, and the secondary side includes a third winding coil and a fourth winding coil, the third winding coil has a first Five terminals and a sixth terminal, the fourth winding coil has a seventh terminal and an eighth terminal, wherein the sixth terminal is electrically connected to the seventh terminal, and the connection between the first terminal and the second terminal A first magnetizing inductance is also included between, and a second magnetizing inductance is also included between the third end and the fourth end;

A control switch, which includes a first transistor switch and a second transistor switch, a drain end of the first transistor switch is electrically connected to the second end, a source end of the first transistor switch is electrically connected connected to a ground, a drain terminal of the second transistor switch is electrically connected to the fourth terminal, and a source terminal of the second transistor switch is electrically connected to the ground;

A power input unit, which includes a first electrode terminal and a second electrode terminal, the first electrode terminal is electrically connected to the first terminal and the third terminal, and the second electrode terminal is electrically connected to the said grounding;

A diode circuit, which includes a first diode, a second diode, a third diode and a fourth diode, a P-type junction end of the first diode is electrically connected To the second end, an N-type junction end of the first diode is electrically connected to a P-type junction end of the second diode, and an N-type junction end of the third diode end is electrically connected to the eighth end, a P-type junction end of the third diode is electrically connected to an N-type junction end of the second diode, and a junction end of the fourth diode is electrically connected to an N-type junction end of the second diode. a P-type junction electrically connected to an N-type junction of the third diode;

A capacitor circuit, which includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein one end of the first capacitor is electrically connected to the N-type junction of the second diode terminal, the other terminal of the first capacitor is electrically connected to the ground, one terminal of the second capacitor and the third capacitor are electrically connected to the fifth terminal and the other terminals are respectively connected to the third two The P-type junction end of the pole tube and an N-type junction end of the fourth diode, one end of the fourth capacitor is electrically connected to the P-type junction end of the second diode, and the fourth capacitor is electrically connected to the P-type junction end of the second diode. the other end is electrically connected to the drain end of the second transistor switch; and

A power output unit has one end electrically connected to the N-type junction end of the fourth diode and the other end electrically connected to the ground.

As a preferred solution, the first transistor switch further includes a gate terminal.

As a preferred solution, the second transistor switch further includes a gate terminal.

As a preferred solution, the first transistor switch or the second transistor switch is a metal oxide semiconductor field effect transistor.

As a preferred solution, wherein the first electrode terminal is a positive electrode terminal.

As a preferred solution, wherein the second electrode terminal is a negative electrode terminal.

As a preferred solution, the power output unit further includes a load.

The power conversion device provided by the present invention has at least the following advantages: high voltage gain, leakage inductance energy recovery and low input current ripple.

Description of drawings

1 is a circuit diagram of a power conversion device with a control switch according to an embodiment of the present invention;

FIG. 2 is an action waveform diagram of the power conversion device with a control switch in FIG. 1;

Fig. 3 is one of the schematic diagrams of the circuit operation of the power conversion device with a control switch in Fig. 1;

Figure 4 is the second schematic diagram of the circuit action of the power conversion device with a control switch in Figure 1;

FIG. 5 is the third schematic diagram of the circuit operation of the power conversion device with a control switch in FIG. 1 .

[Description of main component symbols]

Power conversion device with control switch-1; transformer module-10; first winding coil-101; first end-101a; second end-101b; second winding coil-102; third end-102a; fourth terminal-102b; third winding coil-103; fifth terminal-103a; sixth terminal-103b; fourth winding coil-104; seventh terminal-104a; eighth terminal-104b; first capacitor-C ₁ ; Second capacitor-C ₂ ; third capacitor-C ₃ ; fourth capacitor-C _b ; drain terminal-D; first diode-D ₁ ; second diode-D ₂ ; third diode-D ₃ ; fourth diode-D ₄ ; gate terminal-G; first magnetizing inductance-L _m1 ; second magnetizing inductance-L _m2 ; load-R _o ; source terminal-S; first transistor switch-S ₁ ; The second transistor switch-S ₂ ; the power input unit-V _in ; the power output unit-V _o ; the current-I _o flowing through the load R _o ; the current-i _S1 flowing through the first transistor switch S ₁ ; The current-i _S2 of the second transistor switch _S2 ; the current-i _C1 flowing through the first capacitor _C1 ; the current-i C2 flowing through the second capacitor _C2 ; the current-i _C3 flowing through the _third capacitor _C3 ; The current-i _D1 flowing through the first diode _D1 ; the current-i _D2 flowing through the second diode _D2 ; the current-i _D3 flowing through the third diode _D3 ; The current-i _D4 of the pole tube _D4 ; the current-i _LS of the third winding coil 103; the current-i _Lm1 of the first exciting inductance L _m1 ; the current-i _Lm2 of the second exciting inductance L _m2 ; Primary side current-i _LK1 ; current flowing into the primary side of the second transformer-i _LK2 ; voltage of the first capacitor C ₁ -V _C1 ; voltage of the second capacitor C ₂ -V _C2 ; voltage of the third capacitor C ₃ -V _C3 ; the voltage V _Cb of the fourth capacitor C _b ; the voltage of the third winding coil 103 -V _LS1 ; the voltage of the fourth winding coil 104 -V _LS2 ; the voltage of the drain terminal D of the first transistor switch S ₁ -V _DS1 ; the voltage-V _DS2 of the drain terminal D of the second transistor switch _{S2 ;} the control signal-V _GS1 of the gate terminal G of the first transistor switch _S1 ; the control signal-V of the gate terminal G of the second transistor switch S2 _GS2 ; the voltage of the first magnetizing inductance L _m1 -V _Lm1 ; the voltage of the second magnetizing inductance L _m2 -V _Lm2 .

Detailed ways

In order to make the above objects, features and features of the present invention more comprehensible, the following detailed descriptions of the relevant embodiments of the present invention are as follows with reference to the accompanying drawings.

Please refer to FIG. 1 . FIG. 1 is a circuit diagram of a power conversion device with a control switch according to an embodiment of the present invention.

As can be seen from FIG. 1 , the power conversion device 1 with a control switch includes a transformer module 10 , a control switch, a power input unit V _in , a diode circuit, a capacitor circuit and a power output unit V _o .

The transformer module 10 may include two transformers with independent iron cores, and each transformer has a primary side and a secondary side corresponding to the primary side. In detail, the primary side of the first transformer includes the first winding coil 101 ; the primary side of the second transformer includes the second winding coil 102 . The first winding coil 101 has a first end 101a and a second end 101b, the second winding coil 102 has a third end 102a and a fourth end 102b, and the secondary side of the first transformer includes a third winding coil 103; the second transformer The secondary side includes the fourth winding coil 104 . The third winding coil 103 has a fifth end 103a and a sixth end 103b, and the fourth winding coil 104 has a seventh end 104a and an eighth end 104b. The sixth terminal 103b is electrically connected to the seventh terminal 104a, a first magnetizing inductance L _m1 is included between the first terminal 101a and the second terminal 101b, and a second magnetizing inductance is also included between the third terminal 102a and the fourth terminal 102b. _Lm2 .

The control switch may include a first transistor switch S ₁ and a second transistor switch S ₂ as power switches. The drain terminal (Drain) D of the first transistor switch _S1 is electrically connected to the second terminal 101b, the source terminal S of the first transistor switch _S1 is electrically connected to the ground, and the second transistor switch S The drain terminal (Drain) D of the _second transistor switch S2 is electrically connected to the fourth terminal 102b, and the source terminal S of the second transistor switch _S2 is electrically connected to the ground.

Specifically, the first transistor switch _S1 and/or the second transistor switch _S2 can be a metal-oxide-semiconductor field effect transistor (MOSFET) or a bipolar junction transistor (bipolar junction transistor). , BJT), but not limited to this. Wherein, in such an embodiment, when both the first transistor switch _S1 and the second transistor switch _S2 are metal-oxide-semiconductor field-effect transistors, the first transistor switch _S1 and the second transistor switch _S2 include input control signals The gate terminal G.

The power input unit _Vin includes a first electrode terminal and a second electrode terminal. The first _terminal of the power input unit Vin is electrically connected to the first terminal 101a and the third terminal 102a, and the second _terminal of the power input unit Vin is electrically connected to the ground. Wherein, the first electrode terminal of the power input unit V _in can be a positive electrode terminal; the second electrode terminal of the power input unit V _in can be a negative electrode terminal, but not limited thereto.

The diode circuit includes a first diode D ₁ , a second diode D ₂ , a third diode D ₃ and a fourth diode D ₄ . The P-type junction end of the first diode _D1 is electrically connected to the second end 101b, the N-type junction end of the first diode _D1 is electrically connected to the P-type junction end of the second diode _D2 , The N-type junction end of the third diode _D3 is electrically connected to the eighth terminal 104b, and the P-type junction end of the third diode _D3 is electrically connected to the N-type junction end of the second diode _D2 , The P-type junction end of the fourth diode _D4 is electrically connected to the N-type junction end of the third diode _D3 .

The capacitor circuit includes a first capacitor C ₁ , a second capacitor C ₂ , a third capacitor C ₃ and a fourth capacitor C _b . One end of the first capacitor _C1 is electrically connected to the N-type junction of the second diode _D2 , the other end of the first capacitor _C1 is electrically connected to the ground, the second capacitor _C2 and the third capacitor _C3 One end of the second capacitor is electrically connected to the fifth end 103a, and the other end of the second capacitor is connected to the P-type junction end of the third diode _D3 , and the other end of the third capacitor _C3 is connected to the fourth diode _D4 One end of the fourth capacitor _Cb is electrically connected to the P-type junction end of the second diode _D2 , and the other end of the fourth capacitor _Cb is electrically connected to the drain of the second transistor switch _S2 extreme D.

The power output unit V _o has one end electrically connected to the N-type junction end of the fourth diode _D4 and the other end electrically connected to the ground. In detail, the power output unit V _o also includes a load R _o .

As shown in Figure 2-Figure 5, the symbols in each circuit diagram are represented as follows: I _o : the current flowing through the load R _o ; i _S1 : the current flowing through the first transistor switch S ₁ ; i _S2 : the current flowing through the second The current of the transistor switch S ₂ ; i _C1 : the current flowing through the first capacitor C ₁ ; i _C2 : the current flowing through the second capacitor C ₂ ; i _C3 : the current flowing through the third capacitor C 3 ; i _D1 : the current flowing through the third capacitor C ₃ ; i _D2 : current flowing through the second diode D ₂ ; i _D3 : current flowing through the third diode D ₃ ; i _D4 : flowing through _the fourth diode The current of tube _D4 ; i _LS : the current of the third winding coil 103; i _Lm1 : the current of the first exciting inductance L _m1 ; i _Lm2 : the current of the second exciting inductance L _m2 ; i _LK1 : the primary current flowing into the first transformer i _LK2 : the current flowing into the primary side of the second transformer; V _C1 : the voltage of the first capacitor C ₁ ; V _C2 : the voltage of the second capacitor C ₂ ; V _C3 : the voltage of the third capacitor C ₃ ; V _Cb : the voltage of the fourth capacitor C _b ; V _LS1 : the voltage of the third winding coil 103; V _LS2 : the voltage of the fourth winding coil 104; V _DS1 : the voltage of the drain terminal D of the first transistor switch S ₁ ; V _DS2 : the voltage of the drain terminal D of the second transistor switch _S2 ; V _GS1 : the control signal of the gate terminal G of the first transistor switch _S1 ; V _GS2 : the control signal of the gate terminal G of the second transistor switch _S2 ; V _Lm1 : the voltage of the first magnetizing inductance L _m1 ; V _Lm2 : the voltage of the second magnetizing inductance L _m2 .

Please refer to FIG. 1 , FIG. 2 and FIG. 3 at the same time. FIG. 2 is an action waveform diagram of the power conversion device with control switch in FIG. 1 ; FIG. 3 is one of the circuit action schematic diagrams of the power conversion device with control switch in FIG. 1 .

t

(D-0.5)T(例如，t₀~t₁)；模式二为(D-0.5)Tt

0.5T(例如，t₁~t₂)；模式三为0.5T

t

DT(例如，t₂~t₃)；模式四为DT

t

T(例如，t₃~ t₀)。其中，图2中的V_GS1与V_GS2分别为第一晶体管开关S₁与第二晶体管开关S₂的闸极端G的控制信号。 It can be seen from FIG. 2 that the circuit operation of the power conversion device 1 with control switches includes at least four operation modes. For example: mode 1 is 0

t

(D-0.5)T (for example, t ₀ ~t ₁ ); Mode 2 is (D-0.5)T t

0.5T (for example, t ₁ ~t ₂ ); Mode 3 is 0.5T

t

DT (for example, t ₂ ~t ₃ ); Mode 4 is DT

t

T (for example, t ₃ ~ t ₀ ). Wherein, V _GS1 and V _GS2 in FIG. 2 are control signals of gate terminals G of the first transistor switch S ₁ and the second transistor switch S ₂ , respectively.

Please refer to FIG. 1 , FIG. 2 and FIG. 3 , when the power conversion device 1 with a control switch operates in mode 1 (t ₀ ~ t ₁ ), the circuit operation principle (equivalent circuit) of the power conversion device 1 with a control switch As shown in Figure 3: the first transistor switch S ₁ and the second transistor switch S ₂ are turned on; the first diode D ₁ , the second diode D ₂ , the third diode D ₃ and the fourth and second diodes The pole tube _D4 is reverse-biased and cut-off; the first magnetizing inductance L _m1 and the second magnetizing inductance L _m2 store energy.

Next, please refer to FIG. 1 , FIG. 2 and FIG. 4 . FIG. 4 is the second schematic diagram of the circuit operation of the power conversion device with control switch in FIG. 1 .

When the power conversion device 1 with a control switch operates in mode 2 (t ₁ ~ t ₂ ), the circuit action principle (equivalent circuit) of the power conversion device 1 with a control switch is shown in Figure 4: the first transistor switch S ₁ is turned on with the second diode D ₂ and the fourth diode D ₄ ; the second transistor switch S ₂ is turned off with the first diode D ₁ and the third diode D ₃ .

Next, please refer to FIG. 1 , FIG. 2 and FIG. 3 . When the power conversion device 1 with control switch operates in mode 3 (t ₂ ~ t ₃ ), the operating principle of the circuit is the same as that of mode 1, and the circuit operation principle (equivalent circuit) of the power conversion device 1 with control switch is as follows As shown in Figure 3: the first transistor switch S ₁ and the second transistor switch S ₂ are turned on; the first diode D ₁ , the second diode D ₂ , the third diode D ₃ and the fourth diode The tube _D4 is reverse bias cut-off; the first magnetizing inductance L _m1 and the second magnetizing inductance L _m2 store energy.

After that, please refer to FIG. 1 , FIG. 2 and FIG. 5 . FIG. 5 is the third schematic diagram of the circuit operation of the power conversion device with control switch in FIG. 1 .

When the power conversion device 1 with a control switch operates in mode four (t ₃ ~t ₀ ), the circuit action principle (equivalent circuit) of the power conversion device 1 with a control switch is shown in Figure 5: the second transistor switch S ₂ is conducting with the first diode D ₁ and the third diode D ₃ ; the first transistor switch S ₁ is conducting with the second diode D ₂ and the fourth diode D ₄ .

；其中，V_o为电源输出单元；V_in为电源输入单元；n为变压器模组10的线圈匝数比(例如:二次侧的线圈匝数/一次侧的线圈匝数)；D为工作周期。 Based on the above, the ideal voltage gain can be obtained through the volt-second balance of the magnetizing inductance: V _o / V _in =

; Wherein, V _o is a power output unit; V _in is a power input unit; n is the coil turns ratio of the transformer module 10 (for example: the coil turns of the secondary side/the coil turns of the primary side); D is the working cycle.

From the above, it can be seen that the power conversion device with control switch of the present invention includes the following features:

1. The output terminal (such as the load of the power output unit) can obtain high voltage gain through the coupling inductor turn ratio and rectification voltage doubler circuit;

2. Utilize two sets of power switches (such as the first transistor switch S ₁ and the second transistor switch S ₂ ) to be turned on out of phase, so that the input large current can be divided evenly, thereby reducing the conduction loss of the element, and also having low input current ripple characteristics;

3. It has a function similar to active clamping, which can recycle the leakage inductance energy to the output terminal, effectively suppress the switch surge voltage, and further improve the conversion efficiency; moreover, both sets of power switches are designed on the low-voltage side (for example, primary side), the switching voltage stress is lower than the output voltage, and the parts can be selected with low withstand voltage design.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the patent protection of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the spirit of the patent of the present invention are all the same. Belong to the patent protection scope of the present invention.

Claims (7)

1. the power supply change-over device of a tool control switch is characterized in that, the power supply change-over device of described tool control switch comprises:

One transformer module, it has a secondary side of a primary side and corresponding described primary side, described primary side comprises one first winding coil and one second winding coil, described the first winding coil has a first end and one second end, the second winding coil has one the 3rd end and one the 4th end, and described secondary side comprises a tertiary winding coil and one the 4th winding coil, described tertiary winding coil has a five terminal and one the 6th end, described the 4th winding coil has one the 7th end and one the 8th end, wherein said the 6th end is electrically connected described the 7th end, also comprise one first magnetizing inductance between described first end and the second end, also comprise one second magnetizing inductance between described the 3rd end and the 4th end;

One control switch, it comprises a first transistor switch and a transistor seconds switch, one of described the first transistor switch is let out and extremely is electrically connected to described the second end, the one source pole end of described the first transistor switch is electrically connected to a ground connection, one of described transistor seconds switch is let out and extremely is electrically connected to described the 4th end, and the one source pole end of described transistor seconds switch is electrically connected to described ground connection;

One power input unit, it comprises one first electrode tip and one second electrode tip, and described the first electrode tip is electrically connected to described first end and the 3rd end, and described the second electrode tip is electrically connected to described ground connection;

One diode circuit, it comprises one first diode, one second diode, one the 3rd diode and one the 4th diode, one P type abutting end of described the first diode is electrically connected to described the second end, one N-type abutting end of described the first diode is electrically connected to a P type abutting end of described the second diode, one N-type abutting end of described the 3rd diode is electrically connected to described the 8th end, one P type abutting end of described the 3rd diode is electrically connected to a N-type abutting end of described the second diode, and a P type abutting end of described the 4th diode is electrically connected to the N-type abutting end of described the 3rd diode;

One condenser network, it comprises one first electric capacity, one second electric capacity, one the 3rd electric capacity and one the 4th electric capacity, wherein, one end of described the first electric capacity is electrically connected to the N-type abutting end of described the second diode, the other end of described the first electric capacity is electrically connected to described ground connection, one end of described the second electric capacity and the 3rd electric capacity is electrically connected to described five terminal and is connected to the P type abutting end of described the 3rd diode and a N-type abutting end of the 4th diode at the other end, one end of described the 4th electric capacity is electrically connected to the P type abutting end of described the second diode, and it is extreme that the other end of described the 4th electric capacity is electrically connected to letting out of described transistor seconds switch; And

One power supply output unit, it has N-type abutting end and the other end that an end is electrically connected at described the 4th diode and is electrically connected at described ground connection.

2. have as claimed in claim 1 a power supply change-over device of control switch, it is characterized in that, described the first transistor switch also comprises a gate terminal.

3. have as claimed in claim 1 a power supply change-over device of control switch, it is characterized in that, described transistor seconds switch also comprises a gate terminal.

4. have as claimed in claim 1 a power supply change-over device of control switch, it is characterized in that, described the first transistor switch or transistor seconds switch are a metal-oxide half field effect transistor.

5. have as claimed in claim 1 a power supply change-over device of control switch, it is characterized in that, described the first electrode tip is a positive electricity end.

6. have as claimed in claim 1 a power supply change-over device of control switch, it is characterized in that, described the second electrode tip is that a negative electricity is extreme.

7. have as claimed in claim 1 a power supply change-over device of control switch, it is characterized in that, described power supply output unit also comprises a load.

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