CN213027829U - Double-transformer push-pull circuit suitable for inverter - Google Patents
Double-transformer push-pull circuit suitable for inverter Download PDFInfo
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- CN213027829U CN213027829U CN202021742932.0U CN202021742932U CN213027829U CN 213027829 U CN213027829 U CN 213027829U CN 202021742932 U CN202021742932 U CN 202021742932U CN 213027829 U CN213027829 U CN 213027829U
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Abstract
The utility model provides a two transformer push-pull circuits suitable for dc-to-ac converter, through setting up first transformer and second transformer, the transformer turn ratio reduces half when original single transformer, when input voltage is certain, the secondary side voltage reduces original half, the voltage that obtains after the secondary side is established ties equals original voltage, because the turn ratio reduces, the coupling problem of original, secondary side has better been solved, the loss has been reduced, the electric current that flows through switch tube and transformer primary side all reduces half, the loss also reduces, make the power conversion efficiency of system improve; through setting up switch circuit, switch circuit shunts in parallel, makes the load current on every switch circuit diminish, and switch circuit's operating temperature reduces, and the resistance reduces, and the heat that the circuit produced is less, and the circuit loss reduces, further improves power conversion efficiency.
Description
Technical Field
The utility model relates to an inverter technical field especially relates to a two transformer push-pull circuits suitable for dc-to-ac converter.
Background
The existing inverter mostly adopts high-frequency inversion, and the direct current of the storage battery is firstly boosted by the direct current to generate stable direct current, and then is converted into alternating current by an inverter circuit. The direct current booster circuit is an important link in the inverter, and the development level of the direct current booster circuit plays a certain role in determining the performance of the inverter. The DC-DC voltage-boosting conversion circuit has various structural forms, and is divided into a single-end type, a half-bridge type, a full-bridge type and a push-pull type according to the connection mode of a switching tube. Different from other different structural forms, the push-pull circuit uses two switching tubes and is connected into a push-pull power amplifier form, the circuit is simpler than the traditional inversion, the cost is lower, the output waveform quality is greatly improved, and the push-pull topology is widely applied to the booster circuit. In the pure sine wave output inverter power supply with a two-stage structure, a DC-DC converter is used as a booster circuit of the previous stage, and a push-pull booster circuit has the advantages of small switching loss of a switching tube, high efficiency and the like.
Therefore, in order to solve the above problem, the utility model provides a two transformer push-pull circuits suitable for dc-to-ac converter because the turn ratio reduces, has better solved first, secondary coupling problem, has reduced the loss, has effectively improved power conversion efficiency.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a two transformer push-pull circuits suitable for dc-to-ac converter, because the turn ratio reduces, better solved the primary, secondary coupling problem, reduced the loss, effectively improved power conversion efficiency.
The technical scheme of the utility model is realized like this: the utility model provides a double-transformer push-pull circuit suitable for an inverter, which comprises a CPU chip, a first push-pull boosting module, a second push-pull boosting module, a direct current power supply, a rectifier module, a first transformer and a second transformer;
the output port of PWM1 and the output port of PWM2 of the CPU chip are electrically connected with the input end of the first push-pull boosting module and the input end of the second push-pull boosting module in a one-to-one correspondence manner respectively, the output end of the first push-pull boosting module is electrically connected with one end of the primary side of the first transformer and one end of the primary side of the second transformer respectively, the output end of the second push-pull boosting module is electrically connected with the other end of the primary side of the first transformer and the other end of the primary side of the second transformer respectively, one end of the secondary side of the first transformer is electrically connected with the first input end of the rectifying module, the other end of the secondary side of the first transformer is electrically connected with one end of the secondary side of the second transformer, the other end of the secondary side of the second transformer is electrically connected with the second input end of the rectifying module, the output end of the.
On the basis of the above technical solution, preferably, the first push-pull boosting module includes a first push-pull circuit, a first current spreading circuit, and a second current spreading circuit;
the output port of the PWM1 of the CPU chip is electrically connected with the input end of the first push-pull circuit, the output end of the first push-pull circuit is electrically connected with the input ends of the first current spreading circuit and the second current spreading circuit respectively, the output end of the first current spreading circuit is electrically connected with one end of the primary side of the first transformer, and the output end of the second current spreading circuit is electrically connected with one end of the primary side of the second transformer.
Still further preferably, the first current spreading circuit comprises two groups of switch circuits with the same structure;
the output end of the first push-pull circuit is electrically connected with the input ends of the two groups of switch circuits respectively, and the output ends of the two groups of switch circuits are electrically connected with one end of the primary side of the first transformer respectively.
Still further preferably, the switching circuit includes a resistor R6 and a field effect transistor Q4;
the output end of the first push-pull circuit is electrically connected with the grid electrode of the field-effect transistor Q4 through the resistor R6, the source electrode of the field-effect transistor Q4 is grounded, and the drain electrode of the field-effect transistor Q4 is electrically connected with one end of the primary side of the first transformer.
On the basis of the above technical solution, preferably, the dc power supply has a power output of 12V.
On the basis of the above technical solution, preferably, the system further comprises a feedback module;
the input end of the feedback module is electrically connected with the output end of the rectification module, and the output end of the feedback module is electrically connected with the feedback input port of the CPU chip.
On the basis of the technical scheme, the intelligent alarm device further comprises an alarm module;
the alarm module is electrically connected with the I/O port of the CPU chip.
The utility model discloses following beneficial effect has for prior art:
(1) by arranging the first transformer and the second transformer, the turn ratio of the transformer is reduced to a half of that of the original single transformer, when the input voltage is fixed, the voltage of the secondary side is reduced to the original half, the voltage obtained after the secondary sides are connected in series is equal to the original voltage, and the turn ratio is reduced, so that the coupling problem of the original side and the secondary side is better solved, the loss is reduced, the conduction loss of all the switching tubes and the primary side loss of all the transformers are reduced to the original half, and the conduction loss of the single switching tube and the primary side loss of the single transformer are reduced to 1/4, so that the power conversion efficiency of the system is improved;
(2) through setting up switch circuit, switch circuit shunts in parallel, makes the load current on every switch circuit diminish, and switch circuit's operating temperature reduces, and the resistance reduces, and the heat that the circuit produced is less, and the circuit loss reduces, further improves power conversion efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a system structure diagram of a dual-transformer push-pull circuit suitable for an inverter according to the present invention;
fig. 2 is a circuit diagram of a switching circuit in a dual-transformer push-pull circuit suitable for an inverter according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a two transformer push-pull circuits suitable for dc-to-ac converter, it includes CPU chip, first push-pull boost module, second push-pull boost module, DC power supply, rectifier module, first transformer, second transformer, feedback module and alarm module.
The CPU chip is used for providing PWM square wave pulse signals for the first push-pull boosting module and the second push-pull boosting module; detecting and judging a high-voltage direct-current signal output by the rectifying module fed back by the feedback module, and when the high-voltage direct-current signal output by the rectifying module fed back by the feedback module is greater than or less than a set threshold value, enabling the high-voltage direct-current signal output by the rectifying module to be equal to the set threshold value by adjusting the frequency and the duty ratio of the output PWM square wave pulse signal by the CPU chip; when the CPU detects that the high-voltage direct current signal output by the rectifying module and fed back by the feedback module is larger than a set alarm threshold value, the CPU sends a pulse signal to the alarm module, and the alarm module gives an alarm. The feedback input port of the CPU chip is electrically connected with the output end of the feedback module, the PWM1 output port and the PWM2 output port of the CPU chip are respectively electrically connected with the input end of the first push-pull boosting module and the input end of the second push-pull boosting module in a one-to-one correspondence manner, and the I/O port of the CPU chip is electrically connected with the alarm module. Preferably, in this embodiment, the CPU chip is an SG3525 chip.
And the direct current power supply is used for supplying power to the transformer and providing a 12V direct current power supply. The direct current power supply is electrically connected with the center taps of the first transformer and the second transformer respectively. Preferably, in this embodiment, the dc power supply is a storage battery.
And the first push-pull boosting module and the second push-pull boosting module are used for amplifying the PWM square wave pulse signal output by the CPU chip. The output port of PWM1 and the output port of PWM2 of the CPU chip are respectively and correspondingly electrically connected with the input end of the first push-pull boosting module and the input end of the second push-pull boosting module, the output end of the first push-pull boosting module is respectively and electrically connected with one end of the primary side of the first transformer and one end of the primary side of the second transformer, and the output end of the second push-pull boosting module is respectively and electrically connected with the other end of the primary side of the first transformer and the other end of the primary side of the second transformer.
The first push-pull boost module and the second push-pull boost module may have the same structure or different structures, but in this embodiment, the first push-pull boost module and the second push-pull boost module are provided with the same structure. Preferably, in this embodiment, the first push-pull boost module includes a first push-pull circuit, a first current spreading circuit, and a second current spreading circuit; the second push-pull boosting module comprises a second push-pull circuit, a third current spreading circuit and a fourth current spreading circuit. Only the first push-pull boost module will be described herein.
And the first push-pull circuit is used for amplifying the PWM1 square wave pulse signal output by the PWM1 output port of the CPU chip. As shown in fig. 2, V1 is the current amplified by the first push-pull circuit, and V2 is the current amplified by the second push-pull circuit; the current V1 amplified by the first push-pull circuit is shunted by the two groups of parallel current-amplifying circuits, and each group of current-amplifying circuits is provided with two groups of switch circuits for shunt in parallel, so that the load current of each group of switch circuits is reduced, the working temperature of the switch circuits is reduced, the resistance value of a resistor is reduced, the heat generated by the circuits is small, the circuit loss is reduced, and the power conversion efficiency is improved. The output port of the PWM1 of the CPU chip is electrically connected with the input end of the first push-pull circuit, the output end of the first push-pull circuit is electrically connected with the input ends of the first current spreading circuit and the second current spreading circuit respectively, the output end of the first current spreading circuit is electrically connected with one end of the primary side of the first transformer, and the output end of the second current spreading circuit is electrically connected with one end of the primary side of the second transformer. The present embodiment does not involve an improvement of the first push-pull circuit configuration, and therefore, the circuit configuration of the first push-pull circuit is not described here again.
The circuit structures of the first current spreading circuit and the second current spreading circuit may be the same or different, and in this embodiment, the structures of the first current spreading circuit and the second current spreading circuit are the same, so only the first current spreading circuit is described herein. Preferably, in this embodiment, the first current spreading circuit includes two sets of switch circuits with the same structure, as shown in fig. 2, each switch circuit includes a resistor R6 and a field-effect transistor Q4; the output end of the first push-pull circuit is electrically connected with the grid electrode of the field-effect transistor Q4 through the resistor R6, the source electrode of the field-effect transistor Q4 is grounded, and the drain electrode of the field-effect transistor Q4 is electrically connected with one end of the primary side of the first transformer.
The working principle of the switching circuit is as follows: two groups of switch circuits with the same structure are connected in parallel and shunted, the load current on each switch circuit is small, the working temperature of the switch circuit is reduced, the resistance value of the resistor is reduced, the heat generated by the circuit is small, the circuit loss is reduced, and the power conversion efficiency is improved; the resistor R6 is a protective resistor to prevent static electricity from damaging the FET.
The first transformer and the second transformer are matched with the first push-pull boosting module and the second push-pull boosting module, convert a direct-current voltage signal input by a direct-current power supply into an alternating-current voltage signal and amplify the voltage value of the alternating-current voltage signal; the first transformer and the second transformer form a double-transformer series structure, so that the turn ratio of each transformer is reduced by half compared with that of a single-transformer structure, the secondary side voltage of a single voltage device is reduced by half, and then the originally required voltage is obtained through secondary side series connection. In this embodiment, the output end of the first push-pull boosting module is electrically connected to one end of the primary side of the first transformer and one end of the primary side of the second transformer, the output end of the second push-pull boosting module is electrically connected to the other end of the primary side of the first transformer and the other end of the primary side of the second transformer, one end of the secondary side of the first transformer is electrically connected to the first input end of the rectification module, the other end of the secondary side of the first transformer is electrically connected to one end of the secondary side of the second transformer, the other end of the secondary side of the second transformer is electrically connected to the second input end of the rectification module, and the dc power supply is electrically connected to the center taps of the first transformer and the second transformer. As shown in fig. 2, the first transformer is denoted by T1 and the second transformer is denoted by T2.
And the rectifying module is used for converting the alternating current signals output by the first transformer and the second transformer into high-voltage direct current signals. One end of the secondary side of the first transformer is electrically connected with a first input end of the rectification module, the other end of the secondary side of the second transformer is electrically connected with a second input end of the rectification module, and an output end of the rectification module outputs a high-voltage direct-current signal. The present embodiment does not relate to the improvement of the rectifying module, and therefore, the circuit structure of the rectifying module is not described again.
And the feedback module is used for feeding back the high-voltage direct-current signal output by the rectifying module to the CPU chip. The input end of the feedback module is electrically connected with the output end of the rectification module, and the output end of the feedback module is electrically connected with the feedback input port of the CPU chip. The present embodiment does not involve an improvement of the structure of the feedback module, and therefore, the circuit structure of the feedback module is not described again here.
And the alarm module is used for giving an alarm when the current in the system circuit is over-current. The alarm module is electrically connected with the I/O port of the CPU chip. The present embodiment does not involve an improvement in the circuit structure of the alarm module, and therefore, the circuit structure of the alarm module will not be described in detail herein. Preferably, in this embodiment, the alarm module is a buzzer alarm module.
The utility model discloses a theory of operation is: a PWM1 output port and a PWM2 output port of the CPU chip respectively output two paths of square wave signals of PWM1 and PWM2 to a first push-pull circuit and a second push-pull circuit which are connected in parallel, so that the output currents of the two groups of push-pull circuits are superposed, and the input PWM pulse signals are amplified; the amplified currents are respectively input into a first current amplifying circuit, a second current amplifying circuit, a third current amplifying circuit and a fourth current amplifying circuit, four groups of current amplifying circuits connected in parallel shunt currents output by a first push-pull circuit and a second push-pull circuit, and each group of current amplifying circuits is provided with two groups of switch circuits connected in parallel for shunting; the current shunted by the first current spreading circuit and the second current spreading circuit is respectively input to one end of the primary side of the first transformer and one end of the primary side of the second transformer, the current shunted by the third current spreading circuit and the fourth current spreading circuit is respectively input to the other end of the primary side of the first transformer and the other end of the primary side of the second transformer, simultaneously, the direct current power supply provides 12V direct current for the transformers, so that the first transformer and the second transformer generate electromagnetic induction, the voltage of each secondary side of the transformers is reduced to half of the original voltage, the other ends of the secondary sides of the first transformer and the first transformer are respectively and electrically connected with the rectification module, the other end of the secondary side of the first transformer is electrically connected with one end of the secondary side of the second transformer, finally, the voltage output by the transformers is the original voltage, the transformers convert the received direct current into high-power alternating current signals, and the output alternating current signals are input to the rectification module for, the high-voltage direct current protection circuit comprises a rectification module, a feedback module, a CPU chip and a control module, wherein the rectification module outputs a stable high-voltage direct current signal, the feedback module acquires the high-voltage direct current signal output by the rectification module in real time and feeds the high-voltage direct current signal back to the CPU chip, when the high-voltage direct current signal output by the rectification module fed back by the feedback module is larger than or smaller than a set threshold value, the CPU chip enables the high-voltage direct current signal output by the rectification module to be equal to the set threshold value by adjusting the frequency and the duty ratio of the output PWM square wave pulse signal, and when the CPU detects that the high-voltage direct current signal output by the.
The beneficial effect of this embodiment does: by arranging the first transformer and the second transformer, the turn ratio of the transformer is reduced to a half of that of the original single transformer, when the input voltage is fixed, the voltage of the secondary side is reduced to the original half, the voltage obtained after the secondary sides are connected in series is equal to the original voltage, and the turn ratio is reduced, so that the coupling problem of the original side and the secondary side is better solved, the loss is reduced, the conduction loss of all the switching tubes and the primary side loss of all the transformers are reduced to the original half, and the conduction loss of the single switching tube and the primary side loss of the single transformer are reduced to 1/4, so that the power conversion efficiency of the system is improved;
through setting up switch circuit, switch circuit shunts in parallel, makes the load current on every switch circuit diminish, and switch circuit's operating temperature reduces, and the resistance reduces, and the heat that the circuit produced is less, and the circuit loss reduces, further improves power conversion efficiency.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a two transformer push-pull circuits suitable for dc-to-ac converter, its includes CPU chip, first push-pull boost module, second push-pull boost module, DC power supply and rectifier module, its characterized in that: the transformer also comprises a first transformer and a second transformer;
the PWM1 output port and the PWM2 output port of the CPU chip are respectively and electrically connected with the input end of the first push-pull boosting module and the input end of the second push-pull boosting module in a one-to-one correspondence manner, the output end of the first push-pull boosting module is electrically connected with one end of the primary side of the first transformer and one end of the primary side of the second transformer respectively, the output end of the second push-pull boosting module is electrically connected with the other end of the primary side of the first transformer and the other end of the primary side of the second transformer respectively, one end of the secondary side of the first transformer is electrically connected with the first input end of the rectifying module, the other end of the secondary side of the first transformer is electrically connected with one end of the secondary side of the second transformer, the other end of the secondary side of the second transformer is electrically connected with the second input end of the rectifying module, the output end of the rectifying module outputs a high-voltage direct-current signal, and the direct-current power supply is electrically connected with.
2. A dual transformer push-pull circuit for an inverter as claimed in claim 1, wherein: the first push-pull boosting module comprises a first push-pull circuit, a first current expansion circuit and a second current expansion circuit;
the output port of the PWM1 of the CPU chip is electrically connected with the input end of the first push-pull circuit, the output end of the first push-pull circuit is electrically connected with the input ends of the first current spreading circuit and the second current spreading circuit respectively, the output end of the first current spreading circuit is electrically connected with one end of the primary side of the first transformer, and the output end of the second current spreading circuit is electrically connected with one end of the primary side of the second transformer.
3. A dual transformer push-pull circuit for an inverter as claimed in claim 2, wherein: the first current expanding circuit comprises two groups of switch circuits with the same structure;
the output end of the first push-pull circuit is electrically connected with the input ends of the two groups of switch circuits respectively, and the output ends of the two groups of switch circuits are electrically connected with one end of the primary side of the first transformer respectively.
4. A dual transformer push-pull circuit for an inverter as claimed in claim 3, wherein: the switch circuit comprises a resistor R6 and a field effect transistor Q4;
the output end of the first push-pull circuit is electrically connected with the grid electrode of a field-effect tube Q4 through a resistor R6, the source electrode of the field-effect tube Q4 is grounded, and the drain electrode of the field-effect tube Q4 is electrically connected with one end of the primary side of the first transformer.
5. A dual transformer push-pull circuit for an inverter as claimed in claim 1, wherein: the direct current power supply adopts a direct current power supply with the power output of 12V.
6. A dual transformer push-pull circuit for an inverter as claimed in claim 1, wherein: the device also comprises a feedback module;
the input end of the feedback module is electrically connected with the output end of the rectification module, and the output end of the feedback module is electrically connected with the feedback input port of the CPU chip.
7. A dual transformer push-pull circuit for an inverter as claimed in claim 1, wherein: the device also comprises an alarm module;
and the alarm module is electrically connected with the I/O port of the CPU chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021742932.0U CN213027829U (en) | 2020-08-19 | 2020-08-19 | Double-transformer push-pull circuit suitable for inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021742932.0U CN213027829U (en) | 2020-08-19 | 2020-08-19 | Double-transformer push-pull circuit suitable for inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115333394A (en) * | 2022-09-07 | 2022-11-11 | 深圳市索源科技有限公司 | Multi-transformer combined high-power inverter and power generation system |
| CN115642783A (en) * | 2022-12-06 | 2023-01-24 | 眉山博雅新材料股份有限公司 | High-frequency power supply and power device for high-frequency power supply |
-
2020
- 2020-08-19 CN CN202021742932.0U patent/CN213027829U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115333394A (en) * | 2022-09-07 | 2022-11-11 | 深圳市索源科技有限公司 | Multi-transformer combined high-power inverter and power generation system |
| CN115642783A (en) * | 2022-12-06 | 2023-01-24 | 眉山博雅新材料股份有限公司 | High-frequency power supply and power device for high-frequency power supply |
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