Efficient DC-DC boost converter

Abstract

The utility model discloses a high-efficiency DC-DC boost converter comprising a boost conversion circuit which is provided with an input end and an output end. The boost conversion circuit comprises a BOOST circuit and an excitation circuit, and a common circuit is arranged between the BOOST circuit and the excitation circuit; the common circuit comprises a power transformer BT2, an MOS (Metal Oxide Semiconductor) tube Q6 and a microprocessor; the BOOST circuit further comprises a rectifier diode D6, a capacitor C25 and a capacitor C4; the excitation circuit further comprises a rectifier diode D5 and an inductance coil L2. According to the utility model, the common circuit is arranged, so that the arrangement of inductance electronic elements of the BOOST circuit is reduced, the arrangement of MOS tube electronic elements on the excitation circuit is reduced, the arrangement of electronic elements is reduced while the transmission efficiency and the safety are ensured, the stability of the boost converter is improved, and the failure rate is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of boost converter, specifically relates to a kind of efficient DC-DC boost converter. BACKGROUND

[0002] In various occasions of power system, voltage gain needs to be improved, for example, in the case that the output voltage of photovoltaic / fuel cell power generation system is low, in order to ensure that photovoltaic / fuel cell realizes high voltage gain before grid connection, and to avoid the impact on the voltage of power grid, the current main method is to increase the voltage before the system is connected to the grid by using a boost converter. The existing boost converter mainly includes the boost mode of excitation circuit switching power supply or BOOST, wherein when the excitation circuit switching power supply is boosted, the excitation circuit switching power supply is boosted, the maintenance efficiency and cost are increased; the BOOST mode is difficult to realize the output voltage higher than 10 times the input voltage, and has limitations; the current boost converter has limited boost capability for the system, and when determining the parameters of the components of the boost converter, experience setting is usually used, and the influence of the parameters of each component on the output voltage cannot be comprehensively estimated.

[0003] In view of the above problems, the publication number: 201710804250.4 discloses a combined boost converter and a parameter determination method thereof, the combined boost converter comprising: a boost converter BOOST, the input end of which is connected with a direct current voltage output end, for improving the output voltage of the direct current voltage output end; an isolation converter, the input end of which is connected with the output end of the boost converter, for adjusting the improved output voltage. The present application solves the technical problem of low boost capability of the boost converter provided in the related art. However, the boost converter still has the following problems: it needs more electronic components, has poor stability, affects the conversion efficiency, increases the failure rate and production cost, increases the cost of subsequent maintenance, and the existing converter adopts two or more levels of multi-level boost, but due to the existence of multiple inductors, transformers and MOS tubes and other components, there is multi-level loss, which reduces the output efficiency, affects the stability and efficiency of the boost. UTILITY MODEL CONTENTS

[0004] The utility model is aimed at the technical deficiencies of the present technology, and provides an efficient DC-DC boost converter, to solve the technical problems of the existing boost converter, such as multiple components, high failure rate, low stability and low efficiency.

[0005] The utility model adopts the technical scheme to realize the above-mentioned purposes:

[0006] A high-efficiency DC-DC boost converter, comprising a boost conversion circuit, the boost conversion circuit being provided with an input end and an output end; the boost conversion circuit comprising a BOOST boost circuit and an excitation circuit, a common circuit being provided between the BOOST boost circuit and the excitation circuit; the common circuit being connected with the input end and the output end; the common circuit comprising a power transformer BT2, a MOS tube Q6 and a microprocessor, the microprocessor being provided with a PWM connection end, the microprocessor being used for pulse width modulation to control the bias of the MOS tube Q6; the BOOST boost circuit further comprising a rectifier diode D6, a capacitor C25 and a capacitor C4; the excitation circuit further comprising a rectifier diode D5 and an inductor L2.

[0007] As a further improvement, the input end comprises a positive connection end IN+ and a negative connection end IN-, the positive connection end IN+ being used for connecting a positive voltage of 12V, and the negative connection end IN- being used for connecting a negative voltage of 0V;

[0008] The output end comprises a positive output end OUT+ and a negative output end OUT-, the positive output end OUT+ being used for outputting a positive voltage of 180V after boosting, and the negative output end OUT- being used for outputting a negative voltage of 0V.

[0009] As a further improvement, the power transformer BT2 comprises a primary coil and a secondary coil, the primary coil comprising a first connection end and a second connection end, the first connection end being connected with the positive connection end IN+, the second connection end being connected with the drain of the MOS tube Q6, the gate of the MOS tube Q6 being connected with the PWM connection end, the source of the MOS tube Q6 being connected with the connection end IN-, a third connection end being provided between the gate of the MOS tube Q6 and the PWM connection end, a fourth connection end being provided between the source of the MOS tube Q6 and the connection end IN-, and a resistance R32 being provided between the third connection end and the fourth connection end.

[0010] As a further improvement, the secondary coil is provided with a fifth connection end and a sixth connection end, the fifth connection end being connected with the inductor L2; the sixth connection end being connected with the negative connection end IN- and the negative output end OUT-, and the sixth connection end being further connected with the fourth connection end; an eighth connection end and a ninth connection end being provided between the sixth connection end and the negative connection end IN-, the ninth connection end being connected with the negative connection end IN-;

[0011] A seventh connection end being provided between the second connection end and the drain of the MOS tube Q6, the rectifier diode D6 being connected and arranged between the seventh connection end and the eighth connection end, and the negative electrode of the rectifier diode D6 being connected with the ninth connection end.

[0012] As a further improvement, the capacitor C25 is arranged and connected between the eighth connection end and the ninth connection end; the capacitor C4 is arranged between the negative electrode of the rectifier diode D6 and the ninth connection end.

[0013] As a further improvement, the rectifier diode D5 is connected and arranged between the fifth connection end and the inductor coil L2; the tenth connection end is further arranged between the negative electrode of the rectifier diode D5 and the inductor coil L2; the eleventh connection end and the twelfth connection end are arranged between the inductor coil L2 and the positive output end OUT+; the thirteenth connection end, the fourteenth connection end and the fifteenth connection end are arranged between the sixth connection end and the negative output end OUT-; the resistor R31 is connected between the twelfth connection end and the fifteenth connection end.

[0014] As a further improvement, the capacitor C26 is arranged between the tenth connection end and the thirteenth connection end.

[0015] As a further improvement, the capacitor C1 is arranged between the eleventh connection end and the fourteenth connection end.

[0016] As a further improvement, the sixteenth connection end is further arranged between the positive connection end IN+ and the first connection end; the capacitor C3 is connected to the sixteenth connection end.

[0017] As a further improvement, the ground protection end is connected between one end of the capacitor C3, the sixth connection end and the fourth connection end.

[0018] Compared with the prior art, the above one or more technical solutions in the high-efficiency DC-DC boost converter provided in the embodiments of the utility model have at least one of the following technical effects:

[0019] The utility model discloses a common circuit which is composed of a power transformer BT2, a MOS tube Q6 and a microprocessor to realize the cooperative boosting of the BOOST boost circuit and the excitation circuit, the microprocessor is provided with a PWM connection end, and the microprocessor is used for pulse width modulation to control the bias of the MOS tube Q6. The common circuit reduces the setting of inductive electronic elements of the BOOST boost circuit and the setting of MOS tube electronic elements of the excitation circuit, reduces the setting of electronic elements while guaranteeing the delivery efficiency and safety, improves the stability of the boost converter, reduces the failure rate, and reduces the production cost and subsequent maintenance cost. The common circuit arranged between the BOOST boost circuit and the excitation circuit realizes the cooperative boosting, reduces the multi-stage loss, improves the output efficiency, and guarantees the stability and efficiency of the boost. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 The circuit schematic diagram of the high-efficiency DC-DC boost converter. DETAILED DESCRIPTION

[0022] The following description is only preferred embodiments of the present application, and does not limit the protection scope of the present application.

[0023] Embodiment, see attached Figure 1 A high-efficiency DC-DC boost converter comprises a boost conversion circuit 1, the boost conversion circuit 1 is provided with an input end 2 and an output end 3; the boost conversion circuit 1 comprises a BOOST boost circuit 4 and an excitation circuit 5, and a common circuit 6 is arranged between the BOOST boost circuit 4 and the excitation circuit 5; the common circuit 6 is connected with the input end 2 and the output end 3; the common circuit 6 comprises a power transformer BT2, a MOS tube Q6 and a microprocessor, the microprocessor is provided with a PWM connection end, and the microprocessor is used for pulse width modulation to control the bias of the MOS tube Q6; the BOOST boost circuit further comprises a rectifier diode D6, a capacitor C25 and a capacitor C4; the excitation circuit 5 further comprises a rectifier diode D5 and an inductor L2; the common circuit 6 is used to realize composite boost, thereby reducing the setting of electronic components, reducing the failure rate, and ensuring the stability and efficiency of the boost conversion.

[0024] The input end 2 comprises a positive connection end IN+ and a negative connection end IN-, the positive connection end IN+ is used for connecting a positive voltage of 12V, and the negative connection end IN- is used for connecting a negative voltage of 0V;

[0025] The output end comprises a positive output end OUT+ and a negative output end OUT-, the positive output end OUT+ is used for outputting a positive voltage of 180V after boost, and the negative output end OUT- is used for outputting a negative voltage of 0V.

[0026] The power transformer BT2 includes a primary coil and a secondary coil, the primary coil includes a first connection end and a second connection end, the first connection end is connected with the positive connection end IN+, the second connection end is connected with the drain of the MOS tube Q6, the gate of the MOS tube Q6 is connected with the PWM connection end, the source of the MOS tube Q6 is connected with the connection end IN-; a third connection end is arranged between the gate of the MOS tube Q6 and the PWM connection end, a fourth connection end is arranged between the source of the MOS tube Q6 and the connection end IN-, and a resistance R32 is arranged between the third connection end and the fourth connection end.

[0027] The secondary coil is provided with a fifth connection end and a sixth connection end, the fifth connection end is connected with the inductor coil L2; the sixth connection end is connected with the negative connection end IN- and the negative output end OUT-, and the sixth connection end is also connected with the fourth connection end; an eighth connection end and a ninth connection end are arranged between the sixth connection end and the negative connection end IN-, and the ninth connection end is connected with the negative connection end IN-;

[0028] A seventh connection end is arranged between the second connection end and the drain of the MOS tube Q6, the rectifier diode D6 is connected and arranged between the seventh connection end and the eighth connection end, and the negative electrode of the rectifier diode D6 is connected with the ninth connection end.

[0029] The capacitor C25 is arranged and connected between the eighth connection end and the ninth connection end; the capacitor C4 is arranged between the negative electrode of the rectifier diode D6 and the ninth connection end.

[0030] The rectifier diode D5 is connected and arranged between the fifth connection end and the inductor coil L2; a tenth connection end is further arranged between the negative electrode of the rectifier diode D5 and the inductor coil L2; an eleventh connection end and a twelfth connection end are arranged between the inductor coil L2 and the positive output end OUT+; a thirteenth connection end, a fourteenth connection end and a fifteenth connection end are arranged between the sixth connection end and the negative output end OUT-; and a resistance R31 is arranged between the twelfth connection end and the fifteenth connection end.

[0031] A capacitor C26 is arranged between the tenth connection end and the thirteenth connection end.

[0032] A capacitor C1 is arranged between the eleventh connection end and the fourteenth connection end.

[0033] A sixteenth connection end is further arranged between the positive connection end IN+ and the first connection end; and the sixteenth connection end is connected with a capacitor C3.

[0034] One end of the capacitor C3, the sixth connection end and the fourth connection end are connected with the ground protection end.

[0035] The utility model discloses a set up by power transformer BT2, MOS pipe Q6 and microprocessor constitute the common circuit 6 to realize the cooperative boost of BOOST boost circuit 4 and excitation circuit 5, microprocessor is equipped with PWM connection end, microprocessor is used for pulse width modulation to control the bias of MOS pipe Q6, the common circuit 6 makes the BOOST boost circuit 4 reduce the setting of inductance electronic component, and reduce the setting of MOS pipe electronic component on excitation circuit 5, reduce the setting of electronic component while guaranteeing the delivery efficiency and safety, improve the stability of boost converter, reduce the failure rate, and reduce production cost and subsequent maintenance cost, and through the setting common circuit 6 between BOOST boost circuit 4 and excitation circuit 5 realizes the cooperative boost, reduces the multi-stage loss, improves the efficiency of output, guarantees the stability and efficiency of boost.

[0036] The utility model is not limited to the above-mentioned embodiment, and other DC-DC boost converters for high efficiency obtained by using the same or similar structure or device as the above-mentioned embodiments of the utility model are within the protection scope of the utility model.

Claims

1. An efficient DC-DC step-up converter comprising a step-up conversion circuit, characterized by: The boost conversion circuit is provided with an input end and an output end; the boost conversion circuit comprises a BOOST boost circuit and an excitation circuit, and a common circuit is arranged between the BOOST boost circuit and the excitation circuit; the common circuit is connected with the input end and the output end; the common circuit comprises a power transformer BT2, a MOS tube Q6 and a microprocessor, the microprocessor is provided with a PWM connection end, and the microprocessor is used for pulse width modulation to control the bias of the MOS tube Q6; the BOOST boost circuit further comprises a rectifier diode D6, a capacitor C25 and a capacitor C4; the excitation circuit further comprises a rectifier diode D5 and an inductor L2.

2. The high efficiency DC-DC boost converter of claim 1, wherein: The input end comprises a positive connection end IN+ and a negative connection end IN-, the positive connection end IN+ is used for connecting a positive voltage of 12V, and the negative connection end IN- is used for connecting a negative voltage of 0V; The output end comprises a positive output end OUT+ and a negative output end OUT-, the positive output end OUT+ is used for outputting a positive voltage of 180V after boosting, and the negative output end OUT- is used for outputting a negative voltage of 0V.

3. The high efficiency DC-DC boost converter of claim 2, wherein: The power transformer BT2 comprises a primary coil and a secondary coil, the primary coil comprises a first connection end and a second connection end, the first connection end is connected with the positive connection end IN+, the second connection end is connected with the drain of the MOS tube Q6, the gate of the MOS tube Q6 is connected with the PWM connection end, the source of the MOS tube Q6 is connected with the connection end IN-, a third connection end is arranged between the gate of the MOS tube Q6 and the PWM connection end, a fourth connection end is arranged between the source of the MOS tube Q6 and the connection end IN-, and a resistor R32 is arranged between the third connection end and the fourth connection end.

4. The high efficiency DC-DC boost converter of claim 3, wherein: The secondary coil is provided with a fifth connection end and a sixth connection end, the fifth connection end is connected with the inductor L2, the sixth connection end is connected with the negative connection end IN- and the negative output end OUT-, and the sixth connection end is further connected with the fourth connection end; an eighth connection end and a ninth connection end are arranged between the sixth connection end and the negative connection end IN-, and the ninth connection end is connected with the negative connection end IN-; A seventh connection end is arranged between the second connection end and the drain of the MOS tube Q6, the rectifier diode D6 is connected and arranged between the seventh connection end and the eighth connection end, and the negative electrode of the rectifier diode D6 is connected with the ninth connection end.

5. The high efficiency DC-DC boost converter of claim 4, wherein: The capacitor C25 is arranged and connected between the eighth connection end and the ninth connection end; the capacitor C4 is arranged between the negative electrode of the rectifier diode D6 and the ninth connection end.

6. The high efficiency DC-DC boost converter of claim 5, wherein: The rectifier diode D5 is connected and arranged between the fifth connecting end and the inductor L2; the tenth connecting end is further arranged between the negative electrode of the rectifier diode D5 and the inductor L2; the eleventh connecting end and the twelfth connecting end are arranged between the inductor L2 and the positive output end OUT+; the thirteenth connecting end, the fourteenth connecting end and the fifteenth connecting end are arranged between the sixth connecting end and the negative output end OUT-; the resistance R31 is arranged between the twelfth connecting end and the fifteenth connecting end.

7. The high efficiency DC-DC boost converter of claim 6, wherein: The capacitor C26 is arranged between the tenth connecting end and the thirteenth connecting end.

8. The high efficiency DC-DC boost converter of claim 7, wherein: The capacitor C1 is arranged between the eleventh connecting end and the fourteenth connecting end.

9. The high efficiency DC-DC boost converter of claim 8, wherein: The sixteenth connecting end is further arranged between the positive connecting end IN+ and the first connecting end; the capacitor C3 is connected to the sixteenth connecting end.

10. The high efficiency DC-DC boost converter of claim 9, wherein: The ground protection end is arranged between one end of the capacitor C3, the sixth connecting end and the fourth connecting end.

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