CN110572043B - Direct current voltage transformation control method, direct current voltage transformation circuit and inverter - Google Patents
Direct current voltage transformation control method, direct current voltage transformation circuit and inverter Download PDFInfo
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- CN110572043B CN110572043B CN201910958565.3A CN201910958565A CN110572043B CN 110572043 B CN110572043 B CN 110572043B CN 201910958565 A CN201910958565 A CN 201910958565A CN 110572043 B CN110572043 B CN 110572043B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
Abstract
The invention relates to a direct current voltage transformation control method, a direct current voltage transformation circuit and an inverter, wherein the direct current voltage transformation control method comprises the steps of obtaining direct current input voltage and direct current output voltage; acquiring a duty ratio according to the direct current input voltage and the direct current output voltage; detecting whether the direct current output voltage is matched with a preset voltage or not; when the direct current output voltage is not matched with the preset voltage, the duty ratio is adjusted to enable the direct current output voltage to be matched with the preset voltage. The direct current input voltage and the direct current output voltage are calculated to obtain the duty ratio of the direct current transformation circuit, the size of the direct current output voltage is controlled by adjusting the size of the duty ratio, the size of the direct current output voltage is related to the preset voltage, the size relation between the direct current output voltage and the preset voltage is adjusted by changing the duty ratio, the direct current output voltage is controlled within the range matched with the preset voltage conveniently, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
Description
Technical Field
The invention relates to the technical field of inverters, in particular to a direct-current voltage transformation control method, a direct-current voltage transformation circuit and an inverter.
Background
With the development of power electronic inversion technology, the operation of converting commercial alternating current into direct current for mobile phones and electronic devices of flat lamps becomes a normal state, when power failure occurs or the household appliances work outdoors, a plurality of household appliances using alternating current cannot work normally, but the common equipment for storing electric energy is a storage battery, because the household appliances can only output direct current, the direct current needs to be converted into required alternating current by using an inverter, the inverter has the function of converting low-voltage direct current of direct current power supply equipment or various battery energy storage systems into common alternating current in work and life, the low-voltage direct current can be used for replacing commercial power for computers, televisions, lamps, refrigerators, electric fans, electric blankets, electric cookers, electric kettles, air conditioners, electric tools and the like, and a direct current transformation circuit is needed in the conventional inverter to adjust voltage.
However, most of the dc transformer circuits are in an open-loop or shallow-closed-loop working state, so that the output range is too wide, that is, the output voltage of the dc transformer circuit floats too much, that is, the output voltage of the dc transformer circuit has poor stability, so that the subsequent dc-ac transformer circuit bears high voltage stress, the reliability of the product is reduced, and the product cost is greatly increased.
Disclosure of Invention
In view of this, it is necessary to provide a dc voltage transformation control method, a dc voltage transformation circuit, and an inverter that improve the stability of the dc output voltage.
A direct current voltage transformation control method comprises the following steps: acquiring direct current input voltage and direct current output voltage; acquiring a duty ratio according to the direct current input voltage and the direct current output voltage; detecting whether the direct current output voltage is matched with a preset voltage or not; when the direct current output voltage is not matched with the preset voltage, the duty ratio is adjusted to enable the direct current output voltage to be matched with the preset voltage.
In one embodiment, the adjusting the duty cycle to match the dc output voltage with the preset voltage when the dc output voltage does not match with the preset voltage includes: and when the direct current output voltage is smaller than the preset voltage, increasing the duty ratio.
In one embodiment, the increasing the duty cycle comprises: and under the condition that the primary direct current period is not changed, increasing the conduction time of the direct current voltage.
In one embodiment, the increasing the duty cycle further comprises: and under the condition that the conduction time of the direct-current voltage is not changed, reducing the primary direct-current period of the direct-current voltage.
In one embodiment, the adjusting the duty cycle to match the dc output voltage with the preset voltage when the dc output voltage does not match with the preset voltage includes: and when the direct current output voltage is greater than the preset voltage, reducing the duty ratio.
In one embodiment, the reducing the duty cycle comprises: and reducing the conduction time of the direct current voltage under the condition that the primary direct current period is not changed.
In one embodiment, the reducing the duty cycle comprises: under the condition that the conduction time of the direct-current voltage is not changed, the primary direct-current period of the direct-current voltage is increased.
In one embodiment, before the detecting whether the dc output voltage matches a preset voltage, the method further includes: acquiring a secondary resonance period according to the direct current input voltage and the direct current output voltage; detecting whether the secondary resonance period is smaller than the conduction time of the direct current voltage in the primary direct current period; and when the secondary resonance period is longer than the conduction time of the direct-current voltage in the primary direct-current period, reducing the secondary resonance period to be shorter than the conduction time of the direct-current voltage in the primary direct-current period.
A direct current transformation circuit comprises a bridge type conversion circuit, a transformer, a resonance circuit, a rectification circuit, a detection module and a control module; the bridge type conversion circuit is connected with the input end of the resonance circuit through the transformer, and the output end of the resonance circuit is connected with the rectification circuit; the detection module is respectively connected with the bridge type conversion circuit and the rectification circuit and used for acquiring direct current input voltage and direct current output voltage, and the control module is respectively connected with the detection module and the bridge type conversion circuit and used for acquiring duty ratio according to the direct current input voltage and the direct current output voltage; the control module is also used for detecting whether the direct current output voltage is matched with a preset voltage or not; the control module is further configured to adjust the duty ratio to match the dc output voltage with the preset voltage when the dc output voltage is not matched with the preset voltage.
An inverter comprises a filter circuit, an inverter circuit and the direct current transformation circuit in the embodiment, an external input power supply is connected with the input end of the filter circuit through the direct current transformation circuit, the output end of the filter circuit is connected with the input end of the inverter circuit, and the output end of the inverter circuit is used for being connected with an external electrical appliance and outputting stable alternating current.
In the direct current voltage transformation control method, the direct current voltage transformation circuit and the inverter, the direct current input voltage and the direct current output voltage are calculated to obtain the duty ratio of the direct current voltage transformation circuit, the size of the direct current output voltage is controlled by adjusting the size of the duty ratio, and the size of the direct current output voltage is related to the set preset voltage, so that the size relation between the direct current output voltage and the preset voltage is adjusted by changing the duty ratio, the direct current output voltage is conveniently controlled within the range matched with the preset voltage, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
Drawings
FIG. 1 is a flow chart of a DC voltage transformation control method according to an embodiment;
fig. 2 is a circuit diagram of a dc transformer circuit according to an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention relates to a direct current variable voltage control method. For example, the dc voltage transformation control method includes: acquiring direct current input voltage and direct current output voltage; acquiring a duty ratio according to the direct current input voltage and the direct current output voltage; detecting whether the direct current output voltage is matched with a preset voltage or not; when the direct current output voltage is not matched with the preset voltage, the duty ratio is adjusted to enable the direct current output voltage to be matched with the preset voltage. According to the direct current voltage transformation control method, the direct current input voltage and the direct current output voltage are calculated to obtain the duty ratio of the direct current voltage transformation circuit, the size of the direct current output voltage is controlled by adjusting the size of the duty ratio, the size of the direct current output voltage is related to the preset voltage, the size relation between the direct current output voltage and the preset voltage is adjusted by changing the duty ratio, the direct current output voltage is controlled within the range matched with the preset voltage conveniently, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
Please refer to fig. 1, which is a flowchart illustrating a dc voltage transformation control method according to an embodiment of the present invention.
A direct current voltage transformation control method comprises a part or all of the following steps.
S100: and acquiring direct current input voltage and direct current output voltage.
In this embodiment, the dc input voltage is a dc output voltage of an external input power source, and the dc output voltage of the external input power source is used as a dc input voltage of the dc transformer circuit, where the external input power source is a dc power source device, for example, the external input power source is a battery pack. For a conventional battery pack, the dc output voltage of the battery pack varies within a certain range, for example, the output voltage of the 48V battery pack is within two dc output voltage ranges, i.e., a power-deficient output state and a power-full output state of the battery pack, i.e., the output voltage of the battery pack is between the power-deficient voltage and the power-full voltage, the power-deficient voltage is 42V, the power-full voltage is 60V, and the dc input voltage of the dc transformer circuit is a varying voltage. Under the condition of a fixed duty ratio, the direct current output voltage of the direct current transformation circuit and the direct current input voltage of the direct current transformation circuit are in a linear relation, namely the direct current output voltage of the direct current transformation circuit changes along with the change of the direct current input voltage of the direct current transformation circuit, namely the direct current output voltage of the direct current transformation circuit is also a changed voltage. Therefore, the relation between the direct current input voltage and the direct current output voltage embodies the system duty ratio of the direct current transformation circuit, the duty ratio of the direct current transformation circuit can be conveniently obtained according to the direct current input voltage and the direct current output voltage subsequently, and therefore the duty ratio of the direct current transformation circuit can be conveniently adjusted subsequently.
S200: and acquiring the duty ratio according to the direct current input voltage and the direct current output voltage.
In this embodiment, the dc input voltage and the dc output voltage are input signals and output signals of the dc transformer circuit, the dc input voltage is processed by the dc transformer circuit to obtain corresponding dc output voltage, the dc input voltage is obtained by a transfer function to obtain corresponding dc output voltage, and the transfer function corresponds to an internal circuit structure of the dc transformer circuit, that is, the transfer function is influenced by the internal circuit structure of the dc transformer circuit. Wherein the transfer function may be a function comprising an adjustable variable, for example, the transfer function comprises the number of turns of the transformer and the duty cycle, the number of turns being a fixed value for a selected type of transformer, and only the duty cycle in the transfer function being an adjustable variable. In this way, the functional relationship between the dc input voltage and the dc output voltage can be adjusted by the duty cycle in the transfer function, i.e. by increasing or decreasing the magnitude of the duty cycle, so as to adjust the magnitude relationship between the dc input voltage and the dc output voltage, thereby facilitating the subsequent adjustment of the duty cycle to control the magnitude of the dc output voltage.
S300: and detecting whether the direct current output voltage is matched with a preset voltage.
In this embodiment, the dc output voltage is obtained according to the duty ratio and the dc input voltage, where the dc input voltage is a variable, that is, the dc input voltage is a variable voltage, the dc output voltage is affected by both the duty ratio and the dc input voltage, and the magnitude of the dc output voltage varies according to the duty ratio and the magnitude of the dc input voltage. The preset voltage is a dc output voltage set in advance, and the preset voltage is a fixed dc output voltage, that is, the preset voltage is a dc output voltage with a constant voltage value. Therefore, the direct current output voltage is the voltage which changes along with the time, and the direct current output voltage is compared with the preset voltage, so that the change condition of the direct current output voltage is determined, namely the deviation between the direct current output voltage and the preset voltage is determined, and whether the voltage value of the direct current output voltage is in the range of the voltage value of the preset voltage is further determined, whether the direct current output voltage is in a stable output state is conveniently and accurately determined, and the direct current output voltage with overlarge direct current output voltage floating is conveniently adjusted by changing the duty ratio subsequently.
S400: when the direct current output voltage is not matched with the preset voltage, the duty ratio is adjusted to enable the direct current output voltage to be matched with the preset voltage.
In this embodiment, the dc output voltage is a voltage value that changes with time, that is, the voltage value of the dc output voltage changes at different times, the voltage value of the dc output voltage changes within a certain voltage range, the maximum value of the dc output voltage is a full-voltage, and the minimum value of the dc output voltage is a shortage-voltage. The interval voltage between the full-voltage and the insufficient-voltage is wide, so that the voltage value of the direct-current output voltage is in a large-amplitude change interval, and the voltage value output range of the direct-current output voltage is too large. The preset voltage is in a voltage between the insufficient voltage and the full voltage, the preset voltage can be set according to the electric appliance of practical application, the preset voltage is the direct current output voltage which can be used as a reference, and the direct current output voltage and the matching condition of the preset voltage determine the deviation degree between the direct current output voltage and the preset voltage. Therefore, when the direct current output voltage is not matched with the preset voltage, namely the voltage value of the direct current output voltage is too different from the voltage value of the preset voltage, namely the difference value of the direct current output voltage and the preset voltage is too large or too small, the direct current output voltage is adjusted according to the duty ratio in the transfer function, so that the direct current output voltage is changed to be close to the preset voltage, and further the difference value between the voltage value of the direct current output voltage and the voltage value of the preset voltage is within a normal deviation range, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
In the direct current voltage transformation control method, the direct current input voltage and the direct current output voltage are calculated to obtain the duty ratio of the direct current voltage transformation circuit, the size of the direct current output voltage is controlled by adjusting the size of the duty ratio, the size of the direct current output voltage is related to the preset voltage, and the size relation between the direct current output voltage and the preset voltage is adjusted by changing the duty ratio, so that the direct current output voltage is controlled within the range matched with the preset voltage, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
In one embodiment, the adjusting the duty cycle to match the dc output voltage with the preset voltage when the dc output voltage does not match with the preset voltage includes: and when the direct current output voltage is smaller than the preset voltage, increasing the duty ratio. In this embodiment, in the process of the change of the dc output voltage with time, a voltage difference between the dc output voltage and the preset voltage is greater than a normal deviation range, and a voltage value of the dc output voltage is smaller than a voltage value of the preset voltage, at this time, the dc output voltage is smaller than a difference between the preset voltage and the normal deviation. Therefore, after the direct current input voltage passes through the direct current transformation circuit, the direct current input voltage is superposed through the transfer function to obtain the direct current output voltage, most parameters in the transfer function are fixed values, only the duty ratio is an adjustable parameter, and when the difference value between the direct current output voltage and the preset voltage is large, the duty ratio is adjusted to control the direct current output voltage to be within the range of the preset voltage. When the direct current output voltage is smaller than the preset voltage, it is indicated that the direct current output voltage exceeds a normal deviation, the duty ratio is increased, and a corresponding coefficient of the transfer function is increased, so that a product of the direct current input voltage and the transfer function is increased, the direct current output voltage is increased and approaches the preset voltage, that is, a difference value between the direct current output voltage and the preset voltage is reduced, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
In one embodiment, the increasing the duty cycle comprises: and under the condition that the primary direct current period is not changed, increasing the conduction time of the direct current voltage. In this embodiment, a primary end of a transformer of the dc transformer circuit is a bridge conversion circuit composed of a plurality of electronic switching tubes, where the duty ratio is a duty ratio of the electronic switching tubes, that is, the duty ratio is a duty ratio of the dc transformer circuit, the primary dc period is a duty cycle of the electronic switching tubes, and the duty ratio is a ratio of a dc conduction time of the electronic switching tubes in a single primary dc period to the primary dc period, that is, the duty ratio is a ratio of the dc conduction time in the single primary dc period to the primary dc period. The duty ratio is a ratio of the direct current conduction working time in a single primary direct current period to the primary direct current period, namely the duty ratio is a ratio of the direct current conduction working time in the single primary direct current period to the primary direct current period. The single primary direct current period is a working period of an electronic switching tube at a primary end in the direct current transformation circuit, and the direct current conduction working time refers to the time for continuous working of direct current voltage of the electronic switching tube at the primary end. For the increase of the duty ratio, under the condition that the primary direct current period of the electronic switching tube is fixed, namely the primary direct current period is a fixed value, according to the definition of the duty ratio, the conducting time of the direct current voltage of the electronic switching tube in the primary direct current period is increased, so that the ratio of the conducting time of the direct current voltage of the electronic switching tube in a single primary direct current period to the single primary direct current period is increased, and the duty ratio is increased. When the direct current output voltage is smaller than the preset voltage and exceeds a deviation range, the duty ratio is increased to improve the direct current output voltage, so that the direct current output voltage is close to the preset voltage, the deviation between the direct current output voltage and the preset voltage is reduced, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
In one embodiment, the increasing the duty cycle further comprises: and under the condition that the conduction time of the direct-current voltage is not changed, reducing the primary direct-current period of the direct-current voltage. In this embodiment, a primary end of a transformer of the dc transformer circuit is a bridge conversion circuit composed of a plurality of electronic switching tubes, where the duty ratio is a duty ratio of the electronic switching tubes, that is, the duty ratio is a duty ratio of the dc transformer circuit, the primary dc period is a duty cycle of the electronic switching tubes, and the duty ratio is a ratio of a dc conduction time of the electronic switching tubes in a single primary dc period to the primary dc period, that is, the duty ratio is a ratio of the dc conduction time in the single primary dc period to the primary dc period. For the increase of the duty ratio, under the condition that the conduction time of the direct current voltage of the electronic switching tube is constant, according to the definition of the duty ratio, the ratio of the conduction time of the direct current voltage of the electronic switching tube in a single primary direct current period to the single primary direct current period is increased by reducing the primary direct current period, so that the duty ratio is increased. When the direct current output voltage is smaller than the preset voltage and exceeds a deviation range, the duty ratio is increased to improve the direct current output voltage, so that the direct current output voltage is close to the preset voltage, the deviation between the direct current output voltage and the preset voltage is reduced, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
In one embodiment, the adjusting the duty cycle to match the dc output voltage with the preset voltage when the dc output voltage does not match with the preset voltage includes: and when the direct current output voltage is greater than the preset voltage, reducing the duty ratio. In this embodiment, in the process of the change of the dc output voltage with time, a voltage difference between the dc output voltage and the preset voltage is greater than a normal deviation range, and a voltage value of the dc output voltage is greater than a voltage value of the preset voltage, at this time, the dc output voltage is greater than a difference between the preset voltage and the normal deviation. Therefore, after the direct current input voltage passes through the direct current transformation circuit, the direct current input voltage is superposed through the transfer function to obtain the direct current output voltage, most parameters in the transfer function are fixed values, and only the duty ratio is adjustable parameters. When the difference value between the direct current output voltage and the preset voltage is large, the direct current output voltage is controlled to be within the range of the preset voltage by adjusting the duty ratio. When the direct current output voltage is greater than the preset voltage, the direct current output voltage exceeds a normal deviation, the duty ratio is reduced, the corresponding coefficient of the transfer function is reduced, the product result of the direct current input voltage and the transfer function is reduced, the direct current output voltage is reduced and approaches the preset voltage, namely, the difference value between the direct current output voltage and the preset voltage is reduced, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
In one embodiment, the reducing the duty cycle comprises: and reducing the conduction time of the direct current voltage under the condition that the primary direct current period is not changed. In this embodiment, a primary end of a transformer of the dc transformer circuit is a bridge conversion circuit composed of a plurality of electronic switching tubes, where the duty ratio is a duty ratio of the electronic switching tubes, that is, the duty ratio is a duty ratio of the dc transformer circuit, the primary dc period is a duty cycle of the electronic switching tubes, and the duty ratio is a ratio of a dc conduction time of the electronic switching tubes in a single primary dc period to the primary dc period, that is, the duty ratio is a ratio of the dc conduction time in the single primary dc period to the primary dc period. The duty ratio is a ratio of the direct current conduction working time in a single primary direct current period to the primary direct current period, namely the duty ratio is a ratio of the direct current conduction working time in the single primary direct current period to the primary direct current period. The single primary direct current period is a working period of an electronic switching tube at a primary end in the direct current transformation circuit, and the direct current conduction working time refers to the time for continuous working of direct current voltage of the electronic switching tube at the primary end. For reducing the duty ratio, under the condition that the primary direct current period of the electronic switching tube is fixed, namely the primary direct current period is a fixed value, according to the definition of the duty ratio, the conduction time of the direct current voltage of the electronic switching tube in the primary direct current period is reduced, so that the ratio of the conduction time of the direct current voltage of the electronic switching tube in a single primary direct current period to the single primary direct current period is reduced, and the duty ratio is reduced. When the direct current output voltage is larger than the preset voltage and exceeds the deviation range, the duty ratio is reduced to reduce the direct current output voltage, so that the direct current output voltage is closer to the preset voltage, the deviation between the direct current output voltage and the preset voltage is reduced, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
In one embodiment, the reducing the duty cycle comprises: under the condition that the conduction time of the direct-current voltage is not changed, the primary direct-current period of the direct-current voltage is increased. In this embodiment, a primary end of a transformer of the dc transformer circuit is a bridge conversion circuit composed of a plurality of electronic switching tubes, where the duty ratio is a duty ratio of the electronic switching tubes, that is, the duty ratio is a duty ratio of the dc transformer circuit, the primary dc period is a duty cycle of the electronic switching tubes, and the duty ratio is a ratio of a dc conduction time of the electronic switching tubes in a single primary dc period to the primary dc period, that is, the duty ratio is a ratio of the dc conduction time in the single primary dc period to the primary dc period. For reducing the duty ratio, under the condition that the conduction time of the direct-current voltage of the electronic switching tube is constant, according to the definition of the duty ratio, the ratio of the conduction time of the direct-current voltage of the electronic switching tube in a single primary direct-current period to the single primary direct-current period is reduced by increasing the primary direct-current period, so that the duty ratio is reduced. When the direct current output voltage is larger than the preset voltage and exceeds the deviation range, the duty ratio is reduced to reduce the direct current output voltage, so that the direct current output voltage is closer to the preset voltage, the deviation between the direct current output voltage and the preset voltage is reduced, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
In one embodiment, before the detecting whether the dc output voltage matches a preset voltage, the method further includes: acquiring a secondary resonance period according to the direct current input voltage and the direct current output voltage; detecting whether the secondary resonance period is smaller than the conduction time of the direct current voltage in the primary direct current period; and when the secondary resonance period is longer than the conduction time of the direct-current voltage in the primary direct-current period, reducing the secondary resonance period to be shorter than the conduction time of the direct-current voltage in the primary direct-current period. In this embodiment, a primary side of a transformer in the dc transformer circuit is connected to a bridge-type converting circuit composed of a plurality of electronic switching tubes, a secondary side of the transformer in the dc transformer circuit is connected to a resonant circuit, and a resonant period of the resonant circuit is a secondary resonant period. The relation between the secondary resonance period and the conduction time of the direct-current voltage of the electronic switching tube in the primary direct-current period determines whether the bridge type conversion circuit can realize the function of zero-current switching, wherein the function of the zero-current switching is to improve the energy conversion efficiency. The bridge converter circuit realizes the function of zero current switching only when the secondary resonance period is smaller than the on-time of the dc voltage in the primary dc period, and therefore, after the secondary resonance period is obtained, the secondary resonance period needs to be compared with and adjusted to the on-time of the dc voltage in the primary dc period, so as to realize the function of zero current switching. Therefore, the secondary resonance period is adjusted by replacing components of the resonance circuit, so that the secondary resonance period is always smaller than the conduction time of the direct current voltage in the primary direct current period, the bridge type conversion circuit realizes the function of zero current switching, the voltage utilization rate is improved, and the energy conversion efficiency is improved.
In one embodiment, a direct current transformation circuit is provided and comprises a bridge type conversion circuit, a transformer, a resonance circuit, a rectification circuit, a detection module and a control module; the bridge type conversion circuit is connected with the input end of the resonance circuit through the transformer, and the output end of the resonance circuit is connected with the rectification circuit; the detection module is respectively connected with the bridge type conversion circuit and the rectification circuit and used for acquiring direct current input voltage and direct current output voltage, and the control module is respectively connected with the detection module and the bridge type conversion circuit and used for acquiring duty ratio according to the direct current input voltage and the direct current output voltage; the control module is also used for detecting whether the direct current output voltage is matched with a preset voltage or not; the control module is further configured to adjust the duty ratio to match the dc output voltage with the preset voltage when the dc output voltage is not matched with the preset voltage.
Referring to fig. 2, the dc transformer circuit 10 includes: the circuit comprises a bridge conversion circuit 100, a transformer T3, a resonant circuit 200, a rectification circuit 300, a detection module 400 and a control module 500; an external input power supply is connected with an input end of the bridge conversion circuit 100, an output end of the bridge conversion circuit 100 is connected with a primary end of the transformer T3, and a secondary end of the transformer T3 is connected with the rectifying circuit 300 through the resonant circuit 200; the detection module 400 is respectively connected to the bridge conversion circuit 100 and the rectification circuit 300, and is configured to obtain a dc input voltage and a dc output voltage; the control module 500 is respectively connected to the detection module 400 and the bridge conversion circuit 100, and is configured to obtain a duty ratio according to the dc input voltage and the dc output voltage; the control module 500 is further configured to detect whether the dc output voltage matches a preset voltage; the control module 500 is further configured to adjust the duty ratio to match the dc output voltage with the preset voltage when the dc output voltage is not matched with the preset voltage. In the direct current voltage transformation circuit, the detection module acquires direct current input voltage and direct current output voltage of the direct current voltage transformation circuit, the control module acquires duty ratio of the direct current voltage transformation circuit according to the direct current input voltage and the direct current output voltage, and the control module controls the size of the direct current output voltage by adjusting the duty ratio, so that the direct current output voltage of the direct current voltage transformation circuit is controlled within a fixed voltage range, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
In one embodiment, referring to fig. 2, the bridge converter circuit 100 includes a first electronic switch Q1, a second electronic switch Q2, a third electronic switch Q3, and a fourth electronic switch Q4, wherein a positive terminal of an external input power is connected to a first terminal of the first electronic switch Q1, a second terminal of the first electronic switch Q1 is connected to a first primary terminal of the transformer T3, a second terminal of the first electronic switch Q1 is further connected to a first terminal of the second electronic switch Q2, and a control terminal of the first electronic switch Q1 is connected to the control module 500; the second end of the second electronic switching tube is used for being connected with a negative electrode in an external input power supply, and the control end of the second electronic switching tube is connected with the control module 500; the positive electrode of the external input power source is connected to the first end of the third electronic switching tube Q3, the second end of the third electronic switching tube Q3 is connected to the second primary end of the transformer T3, the second end of the third electronic switching tube Q3 is further connected to the first end of the fourth electronic switching tube Q4, and the control end of the third electronic switching tube Q3 is connected to the control module 500; the second end of the fourth electronic switch Q4 is used for being connected to the negative electrode of the external input power source, and the control end of the fourth electronic switch Q4 is connected to the control module 500. In this embodiment, the first electronic switching tube Q1, the second electronic switching tube Q2, the third electronic switching tube Q3 and the fourth electronic switching tube Q4 constitute a circuit of a bridge structure, that is, the first electronic switching tube Q1 and the second electronic switching tube Q2 are connected in series to form a first switching group, the third electronic switching tube Q3 and the fourth electronic switching tube Q4 are connected in series to form a second switching group, and the first switching group and the second switching group are respectively connected to an external input power source, so that the first switching group and the second switching group are connected in parallel, wherein a connection point of the first electronic switching tube Q1 and the second electronic switching tube Q2 is connected to a first primary terminal of the transformer T3, and a connection point of the third electronic switching tube Q3 and the fourth electronic switching tube Q4 is connected to a second primary terminal of the transformer T3. In this way, the first electronic switch Q1 and the fourth electronic switch Q4 form a set of current conducting switch sets, the first electronic switch Q1 and the fourth electronic switch Q4 are turned on and off simultaneously under the control of the control module 500, the second electronic switch Q3 and the third electronic switch Q3 form another set of current conducting switch sets, and the second electronic switch Q3 are turned on and off simultaneously under the control of the control module 500, wherein the control module 500 controls the two sets of current conducting switch sets to be alternately turned on, so that the primary end of the transformer T3 generates periodically-changed alternating current, so that the secondary end of the transformer T3 induces corresponding induced alternating current, so as to generate resonance on the resonance circuit 200, so as to facilitate the bridge converter circuit 100 and the rectifier circuit 300 to realize the zero-current switching function, the voltage utilization rate of the direct current transformation circuit is improved, the operation loss of the direct current transformation circuit is reduced, and the energy conversion efficiency of the direct current transformation circuit is improved.
In one embodiment, the first electronic switching tube, the second electronic switching tube, the third electronic switching tube and the fourth electronic switching tube each include a field effect tube and a zener diode, a drain of the field effect tube is connected to a negative electrode of the zener diode, and a source of the field effect tube is connected to a positive electrode of the zener diode. In this embodiment, the first end of the first electronic switching tube is the drain of the corresponding fet, and the second end of the first electronic switching tube is the source of the corresponding fet; the first end of the second electronic switching tube is the drain electrode of the corresponding field effect tube, and the second end of the second electronic switching tube is the source electrode of the corresponding field effect tube; the first end of the third electronic switching tube is the drain electrode of the corresponding field effect tube, and the second end of the third electronic switching tube is the source electrode of the corresponding field effect tube; the first end of the fourth electronic switching tube is the drain electrode of the corresponding field effect tube, and the second end of the fourth electronic switching tube is the source electrode of the corresponding field effect tube. The voltage stabilizing diode is positioned between the source electrode and the drain electrode of the field effect transistor, the voltage stabilizing function of the voltage stabilizing diode reduces the probability that the field effect transistor is broken down by high voltage, the normal work of the field effect transistor is ensured, the working stability of the bridge type conversion circuit is improved, and therefore the working stability of the direct current transformation circuit is improved.
In one embodiment, referring to fig. 2, the detection module 400 has a first detection terminal 410, and the first detection terminal 410 is respectively connected to a first terminal of the first electronic switch Q1 and a second terminal of the second electronic switch Q2. In this embodiment, the first detection terminal 410 is connected to the first terminal of the first electronic switch Q1 to obtain a potential of one terminal of an external input power, the first detection terminal 410 is connected to the second terminal of the second electronic switch Q2 to obtain a potential of the other terminal of the external input power, and the detection module 400 obtains a dc input voltage of the external input power according to the two potentials obtained by the first detection terminal 410, that is, obtains a difference between the two potentials obtained by the first detection terminal 410. In this way, the first detection terminal 410 of the detection module 400 detects the dc input voltage of the external input power source in real time, so as to obtain the dc input voltage of the external input power source in real time, which is convenient for combining with the dc output voltage to obtain the duty ratio of the dc transformer circuit.
In one embodiment, referring to fig. 2, the output terminal of the control module 500 is respectively connected to the control terminal of the first electronic switch Q1, the control terminal of the second electronic switch Q2, the control terminal of the third electronic switch Q3, and the control terminal of the fourth electronic switch Q4. In this embodiment, the control module 500 has a plurality of output terminals, the control terminal of the first electronic switch Q1, the control terminal of the second electronic switch Q2, the control terminal of the third electronic switch Q3 and the control terminal of the fourth electronic switch Q4 are respectively connected to one output terminal of the control module 500, that is, the control terminal of the first electronic switch Q1 is connected to one output terminal of the control terminals of the control module 500, the control terminal of the second electronic switch Q2 is connected to another output terminal of the control terminals of the control module 500, the control terminal of the third electronic switch Q3 is connected to another output terminal of the control terminals of the control module 500, and the control terminal of the fourth electronic switch Q4 is connected to another output terminal of the control terminals of the control module 500. A first on signal received by the control module 500 and an output terminal connected to the control terminal of the first electronic switch Q1 and the control terminal of the fourth electronic switch Q4, and a second on signal received by the control module 500 and an output terminal connected to the control terminal of the second electronic switch Q2 and the control terminal of the third electronic switch Q3, where the first on signal and the second on signal are alternating on signals, that is, when the first on signal is in an on interval, the second on signal is in an off interval; when the first conducting signal is in a closing interval, the second conducting signal is in a conducting interval. In this way, the two conducting signals output by the control module 500 are used to control the on and off states of the first electronic switching tube Q1, the second electronic switching tube Q2, the third electronic switching tube Q3 and the fourth electronic switching tube Q4, the on and off states of the first electronic switching tube Q1 and the fourth electronic switching tube Q4 are the same, the on and off states of the second electronic switching tube Q2 and the third electronic switching tube Q3 are the same, and the on and off states of the first electronic switching tube Q1 and the second electronic switching tube Q2 alternate with each other, so that the bridge converting circuit 100 outputs a periodically alternating ac signal, so that the primary terminal of the transformer T3 generates a periodically alternating ac signal, and the secondary terminal of the transformer T3 generates a corresponding ac signal, thereby facilitating the resonance with the resonant circuit 200, therefore, the zero current switching function of the bridge type conversion circuit 100 and the rectifying circuit 300 is realized conveniently, the voltage utilization rate of the direct current transformation circuit is improved, the operation loss of the direct current transformation circuit is reduced, and the energy conversion efficiency of the direct current transformation circuit is improved.
In one embodiment, the control module has a first output terminal and a second output terminal, the first output terminal is connected to the control terminal of the first electronic switch tube and the control terminal of the fourth electronic switch tube, and the second output terminal is connected to the control terminal of the second electronic switch tube and the control terminal of the third electronic switch tube. In this way, the on and off states of the first electronic switch tube and the fourth electronic switch tube are the same, the on and off states of the second electronic switching tube and the third electronic switching tube are the same, moreover, the on and off states of the first electronic switch tube and the second electronic switch tube are mutually alternated, the bridge type conversion circuit outputs a periodically alternating current signal, so that the primary end of the transformer generates the periodically alternating current signal, thereby causing the secondary end of the transformer to generate a corresponding induced AC signal for generating resonance with the resonance circuit, therefore, the zero current switching function of the bridge type conversion circuit and the rectifying circuit is convenient to realize, the voltage utilization rate of the direct current transformation circuit is improved, the operation loss of the direct current transformation circuit is reduced, and the energy conversion efficiency of the direct current transformation circuit is improved.
In one embodiment, referring to fig. 2, the resonant circuit 200 includes a first capacitor C1 and a first inductor L1, a first secondary terminal of the transformer T3 is connected to a first terminal of the first capacitor C1, a second terminal of the first capacitor C1 is connected to a first input terminal of the rectifier circuit 300, a second secondary terminal of the transformer T3 is connected to a first terminal of the first inductor L1, and a second terminal of the first inductor L1 is connected to a second input terminal of the rectifier circuit 300. In the present embodiment, the first capacitor C1 and the first inductor L1 form the resonant circuit 200, the first capacitor C1 is connected in series with the first inductor L1, and the resonant circuit 200 is a series resonant circuit 200. The secondary end of the transformer T3 generates an induced ac signal, and the frequency of the induced ac signal is equal to the resonant frequency of the resonant circuit 200, so that the equivalent reactance of the resonant circuit 200 is zero, and is resistive, and the resonant circuit 200 resonates, thereby facilitating the realization of the zero current switching function of the bridge type conversion circuit 100 and the rectifier circuit 300, improving the voltage utilization rate of the dc transformer circuit, reducing the operating loss of the dc transformer circuit, and improving the energy conversion efficiency of the dc transformer circuit.
In one embodiment, the resonant circuit includes a second capacitor and a second inductor, the first secondary terminal of the transformer is connected to the first input terminal of the rectifier circuit through the second capacitor, and the first secondary terminal of the transformer is further connected to the first input terminal of the rectifier circuit through the second inductor. In this embodiment, the second capacitor and the second inductor form the resonant circuit, the second capacitor is connected in parallel with the second inductor, and the resonant circuit is a parallel resonant circuit. The secondary end of the transformer generates an induction alternating current signal, the induction alternating current signal passes through the resonant circuit, the frequency of the current and the frequency of the voltage of the induction alternating current signal are the same, and the frequency of the induction alternating current signal is equal to the resonant frequency of the resonant circuit, so that the equivalent reactance of the resonant circuit is zero, and the induction alternating current signal presents resistance, so that the resonant circuit generates resonance, the zero-current switching function of the bridge type conversion circuit and the rectifying circuit is conveniently realized, the voltage utilization rate of the direct current transformation circuit is improved, the running loss of the direct current transformation circuit is reduced, and the energy conversion efficiency of the direct current transformation circuit is improved.
In one embodiment, referring to fig. 2, the rectifying circuit 300 includes a first unidirectional conductive tube D1, a second unidirectional conductive tube D2, a third unidirectional conductive tube D3, and a fourth unidirectional conductive tube D4, a first output end of the resonant circuit 200 is connected to a positive electrode of the first unidirectional conductive tube D1, a negative electrode of the first unidirectional conductive tube D1 is connected to a negative electrode of the third unidirectional conductive tube D3, and a negative electrode of the first unidirectional conductive tube D1 is further connected to the detecting module 400; the anode of the second unidirectional conductive tube D2 is grounded, and the cathode of the second unidirectional conductive tube D2 is connected with the anode of the first unidirectional conductive tube D1; a second output end of the resonant circuit 200 is connected with the anode of the third unidirectional conductive tube D3; the positive electrode of the fourth unidirectional conductive tube D4 is grounded, and the negative electrode of the fourth unidirectional conductive tube D4 is connected with the positive electrode of the third unidirectional conductive tube D3. In this embodiment, the rectifying circuit 300 has a bridge circuit structure, the first unidirectional conductive tube D1 is connected in series with the second unidirectional conductive tube D2, the third unidirectional conductive tube D3 is connected in series with the fourth unidirectional conductive tube D4, a connection between the first unidirectional conductive tube D1 and the second unidirectional conductive tube D2 is connected to a first output terminal of the resonant circuit 200, and a connection between the third unidirectional conductive tube D3 and the fourth unidirectional conductive tube D4 is connected to a second output terminal of the resonant circuit 200. The junction of the first unidirectional conductive tube D1 and the second unidirectional conductive tube D2 is the junction of the positive electrode of the first unidirectional conductive tube D1 and the negative electrode of the second unidirectional conductive tube D2, and the junction of the third unidirectional conductive tube D3 and the fourth unidirectional conductive tube D4 is the junction of the positive electrode of the third unidirectional conductive tube D3 and the negative electrode of the fourth unidirectional conductive tube D4. In this way, since the secondary terminal of the transformer T3 generates an induced ac signal, that is, the secondary terminal of the transformer T3 generates an induced ac, the input terminal of the rectifier circuit 300 receives the induced ac, and the output terminal of the rectifier circuit 300 generates a dc through the rectification function of the rectifier circuit 300, so that the rectifier circuit 300 outputs a stable dc voltage.
In one embodiment, referring to fig. 2, the detecting module 400 further has a second detecting terminal 420, and the second detecting terminal 420 is connected to the negative electrode of the first unidirectional conductive tube D1. In this embodiment, the second detection end 420 is further connected to a negative electrode of the third unidirectional conductive tube D3, the second detection end 420 is configured to obtain a potential of a negative electrode of the first unidirectional conductive tube D1, a positive electrode of the first unidirectional conductive tube D1 is connected to a negative electrode of the second unidirectional conductive tube D2, a positive electrode of the second unidirectional conductive tube D2 is grounded, and a potential of a negative electrode of the first unidirectional conductive tube D1 is an output voltage of the rectifier circuit 300, that is, the second detection end 420 obtains a dc output voltage of the dc transformer circuit. In this way, the second detection terminal 420 of the detection module 400 detects the dc output voltage of the dc transformer circuit in real time, so as to combine the dc output voltage to obtain the duty ratio of the dc transformer circuit.
In one embodiment, an inverter is provided, which includes a filter circuit, an inverter circuit, and the dc transformer circuit in the above embodiments, an external input power source is connected to an input terminal of the filter circuit through the dc transformer circuit, an output terminal of the filter circuit is connected to an input terminal of the inverter circuit, and an output terminal of the inverter circuit is used for being connected to an external electrical appliance and outputting a stable ac power.
In the inverter, the detection module acquires the direct current input voltage and the direct current output voltage of the direct current transformation circuit, the control module acquires the duty ratio of the direct current transformation circuit according to the direct current input voltage and the direct current output voltage, and the control module controls the size of the direct current output voltage by adjusting the duty ratio, so that the direct current output voltage of the direct current transformation circuit is controlled within a fixed voltage range, the floating of the direct current output voltage is reduced, and the stability of the direct current output voltage is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A direct current voltage transformation control method is characterized by comprising the following steps:
acquiring direct current input voltage of a direct current transformation circuit and direct current output voltage of the direct current transformation circuit; wherein, the secondary of the transformer of the DC transformation circuit is connected with a resonance circuit, the output end of the resonance circuit is connected with a rectification circuit, the resonant circuit comprises a first capacitor and a first inductor, the first secondary end of the transformer is connected with the first end of the first capacitor, the second end of the first capacitor is connected with the first input end of the rectifying circuit, the second secondary end of the transformer is connected with the first end of the first inductor, the second end of the first inductor is connected with the second input end of the rectifying circuit, the resonance period of the resonance circuit is a secondary resonance period, the primary of the transformer of the direct current transformation circuit is connected with a bridge type conversion circuit consisting of a plurality of electronic switching tubes, the working period of the electronic switching tube is a primary direct current period, and the secondary resonance period is less than the conduction time of direct current voltage of the electronic switching tube in the primary direct current period;
acquiring a duty ratio according to the direct current input voltage and the direct current output voltage;
detecting whether the direct current output voltage is matched with a preset voltage or not;
when the direct current output voltage is not matched with the preset voltage, adjusting the duty ratio to enable the direct current output voltage to be matched with the preset voltage;
when the dc output voltage is not matched with the preset voltage, adjusting the duty ratio to match the dc output voltage with the preset voltage includes:
when the direct current output voltage is smaller than the preset voltage, reducing the primary direct current period of the direct current voltage under the condition that the conduction time of the direct current voltage is not changed; and
and when the direct current output voltage is greater than the preset voltage, under the condition that the conduction time of the direct current voltage is not changed, increasing the primary direct current period of the direct current voltage.
2. A direct current transformation circuit is characterized by comprising a bridge type transformation circuit, a transformer, a resonance circuit, a rectification circuit, a detection module and a control module; the bridge type conversion circuit is connected with the input end of the resonance circuit through the transformer; the output end of the resonant circuit is connected with the rectifying circuit, the resonant circuit comprises a first capacitor and a first inductor, the first secondary end of the transformer is connected with the first end of the first capacitor, the second end of the first capacitor is connected with the first input end of the rectifying circuit, the second secondary end of the transformer is connected with the first end of the first inductor, and the second end of the first inductor is connected with the second input end of the rectifying circuit; the resonance period of the resonance circuit is less than the conduction time of the direct-current voltage in the primary direct-current period, and the conduction time of the direct-current voltage in the primary direct-current period is the conduction time of an electronic switching tube in the bridge type conversion circuit; the detection module is respectively connected with the bridge type conversion circuit and the rectification circuit and used for acquiring direct current input voltage and direct current output voltage, and the control module is respectively connected with the detection module and the bridge type conversion circuit and used for acquiring duty ratio according to the direct current input voltage and the direct current output voltage; the control module is also used for detecting whether the direct current output voltage is matched with a preset voltage or not; the control module is further used for adjusting the duty ratio to enable the direct current output voltage to be matched with the preset voltage when the direct current output voltage is not matched with the preset voltage; wherein when the dc output voltage is not matched with the preset voltage, adjusting the duty ratio to match the dc output voltage with the preset voltage comprises: when the direct current output voltage is smaller than the preset voltage, the primary direct current period of the direct current voltage is reduced under the condition that the conduction time of the direct current voltage is not changed, and when the direct current output voltage is larger than the preset voltage, the primary direct current period of the direct current voltage is increased under the condition that the conduction time of the direct current voltage is not changed.
3. The direct current transformation circuit according to claim 2, wherein the bridge converter circuit includes a first electronic switch tube, a second electronic switch tube, a third electronic switch tube and a fourth electronic switch tube, a positive terminal of an external input power source is connected to a first end of the first electronic switch tube, a second end of the first electronic switch tube is connected to the first primary end of the transformer, a second end of the first electronic switch tube is further connected to a first end of the second electronic switch tube, and a control end of the first electronic switch tube is connected to the control module; the second end of the second electronic switching tube is used for being connected with a negative electrode in an external input power supply, and the control end of the second electronic switching tube is connected with the control module; the positive electrode of an external input power supply is connected with the first end of the third electronic switching tube, the second end of the third electronic switching tube is connected with the second primary end of the transformer, the second end of the third electronic switching tube is also connected with the first end of the fourth electronic switching tube, and the control end of the third electronic switching tube is connected with the control module; and the second end of the fourth electronic switching tube is used for being connected with a negative electrode in an external input power supply, and the control end of the fourth electronic switching tube is connected with the control module.
4. The DC transformer circuit of claim 3, wherein the first electronic switching tube, the second electronic switching tube, the third electronic switching tube and the fourth electronic switching tube each comprise a field effect tube and a voltage regulator diode, a drain of the field effect tube is connected to a cathode of the voltage regulator diode, and a source of the field effect tube is connected to an anode of the voltage regulator diode.
5. The DC transformer circuit of claim 4, wherein the detection module has a first detection terminal connected to the first terminal of the first electronic switch tube and the second terminal of the second electronic switch tube.
6. The direct current transformation circuit according to claim 2, wherein the rectification circuit comprises a first unidirectional conductive tube, a second unidirectional conductive tube, a third unidirectional conductive tube and a fourth unidirectional conductive tube, the first output end of the resonance circuit is connected to the positive electrode of the first unidirectional conductive tube, the negative electrode of the first unidirectional conductive tube is connected to the negative electrode of the third unidirectional conductive tube, and the negative electrode of the first unidirectional conductive tube is further connected to the detection module; the anode of the second unidirectional conductive tube is grounded, and the cathode of the second unidirectional conductive tube is connected with the anode of the first unidirectional conductive tube; the second output end of the resonant circuit is connected with the anode of the third one-way conductive tube; the positive electrode of the fourth unidirectional conductive tube is grounded, and the negative electrode of the fourth unidirectional conductive tube is connected with the positive electrode of the third unidirectional conductive tube.
7. The DC transformer circuit of claim 6, wherein the detection module further has a second detection terminal connected to a negative electrode of the first unidirectional conductive tube.
8. An inverter, comprising a filter circuit, an inverter circuit and the dc transformer circuit as claimed in claim 2, wherein an external input power is connected to the input terminal of the filter circuit through the dc transformer circuit, the output terminal of the filter circuit is connected to the input terminal of the inverter circuit, and the output terminal of the inverter circuit is used for connecting to an external electrical appliance and outputting a stable ac power.
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