CN112803783A - Digital control-based direct current converter gain modulation system - Google Patents
Digital control-based direct current converter gain modulation system Download PDFInfo
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- CN112803783A CN112803783A CN202110284621.7A CN202110284621A CN112803783A CN 112803783 A CN112803783 A CN 112803783A CN 202110284621 A CN202110284621 A CN 202110284621A CN 112803783 A CN112803783 A CN 112803783A
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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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Dc-Dc Converters (AREA)
Abstract
The application relates to a digital control-based direct current converter gain modulation system, which comprises a leading bridge arm unit, a lagging bridge arm unit, a rectifying unit, a driving unit and a control unit; the leading bridge arm unit and the lagging bridge arm unit are both connected in parallel to a direct-current power supply and respectively comprise two switching devices connected in series to output input voltage; the rectifying unit is used for connecting an input voltage to output an output voltage within a specified range; the control unit is connected with the rectifying unit and used for detecting whether an error value exists between the output voltage and a preset value or not, and outputting a group of control signals corresponding to the error value when the error value exists; and the driving unit is connected with the control unit and used for driving the switching devices in the leading bridge arm unit and the lagging bridge arm unit to work complementarily and driving the switching devices in the leading bridge arm unit and the lagging bridge arm unit to work in a staggered manner when receiving the control signal. The direct current converter can be subjected to frequency modulation and phase modulation simultaneously, and the gain variation range of the direct current converter is further enlarged.
Description
Technical Field
The present application relates to the field of dc converters, and in particular, to a digital control based gain modulation system for a dc converter.
Background
At present, the new energy industry is developing very rapidly, and consequently, the dc converter is widely used. The direct current converter has the effects of quick response and electric energy saving in the application process, and has the effect of inhibiting harmonic current noise on the side of a power grid.
However, with the development of the technology level, the battery voltage values of some electronic products are gradually diversified, and the variation range thereof is gradually widened. However, the output range of the general dc converter is limited, which cannot satisfy the electronic products with special battery voltages, so that the electronic products with special battery voltages are limited in use, which causes inconvenience.
Disclosure of Invention
In order to expand the gain variation range of the direct current converter, the application provides a direct current converter gain modulation system based on digital control.
The technical scheme adopted by the digital control-based direct current converter gain modulation system is as follows:
a digital control-based direct current converter gain modulation system comprises a leading bridge arm unit, a lagging bridge arm unit, a rectifying unit, a driving unit and a control unit;
the leading bridge arm unit is connected with direct current voltage and comprises two switching devices connected in series;
the lag bridge arm unit is connected with the lead bridge arm in parallel and comprises two switching devices connected in series;
the common ends of the two switching devices of the leading bridge arm unit and the common ends of the two switching devices of the lagging bridge arm unit output input voltages with alternate directions;
the rectifying unit is used for connecting the input voltage to output an output voltage within a specified range;
the control unit is connected with the rectifying unit and used for detecting whether an error value exists between the accessed output voltage and the acquired preset value or not and outputting a group of control signals corresponding to the error value when the error value exists between the output voltage and the preset value;
and the driving unit is connected with the control unit and used for driving the switching devices in the leading bridge arm unit and the lagging bridge arm unit to work complementarily and driving the switching devices in the leading bridge arm unit and the lagging bridge arm unit to work in a staggered manner when receiving a control signal.
By adopting the technical scheme, the leading bridge arm unit, the lagging bridge arm unit and the rectifying unit can form a direct current converter, so that the accessed direct current voltage can be converted into alternating current firstly and then into direct current to output the output voltage within the specified range. The control unit can obtain the output voltage and the preset voltage value and calculate the error value of the output voltage and the preset voltage value so as to output a group of control signals corresponding to the error value. When the driving unit receives a group of control signals, the switching devices of the leading bridge arm unit can be driven to alternately work, the switching devices of the lagging bridge arm unit are driven to alternately work after lagging the switching devices of the leading bridge arm unit, and the constant frequency modulation and the variable frequency modulation can be simultaneously carried out on the direct current converter, so that the gain change range of the direct current converter is expanded.
Optionally, the driving unit includes a first driving circuit and a second driving circuit, and both the first driving circuit and the second driving circuit are connected to the control unit;
the first driving circuit is used for driving the two switching devices of the leading bridge arm unit so as to enable the two switching devices to be alternately conducted;
and the second driving circuit is used for driving the two devices of the lag bridge arm unit so as to enable the two switching devices to be alternately conducted when the phase difference value exists between the two switching devices of the lead bridge arm unit and the two switching devices of the lag bridge arm unit.
By adopting the technical scheme, the first driving circuit can independently drive the two switching devices of the leading bridge arm unit to alternately work, and the second driving circuit can independently drive the two switching devices of the lagging bridge arm unit to alternately work, so that the circuit is convenient to simplify.
Optionally, the rectifying unit includes a resonant circuit, a transformer, a rectifying circuit and a sampling circuit;
the resonant circuit is used for filtering the input voltage to output a smoother input voltage;
the transformer is connected with the resonant circuit and used for transforming the smooth input voltage to output alternating current with specified size;
the rectifying circuit is connected with the transformer and is used for rectifying the alternating current with the specified magnitude so as to output direct current with the specified magnitude;
the sampling circuit is connected with the rectifying circuit and used for dividing the direct current with the specified size so as to output the output voltage.
By adopting the technical scheme, the transformer and the rectifying circuit can transform the input alternating current into the direct current firstly so as to output the direct current within the specified range. The resonant circuit can filter the accessed voltage, so that the voltage is smooth. The sampling circuit can acquire the output voltage with the specified size by utilizing a voltage division mode.
Optionally, the rectifier circuit includes two switching devices connected in series;
the driving unit further comprises a third driving circuit, wherein the third driving circuit is connected with the control unit and is used for synchronously driving the two switching devices in the rectifying circuit when the first driving circuit drives the two switching devices of the leading bridge arm unit and the second driving circuit drives the two switching devices of the lagging bridge arm unit, so that the two switching devices between the transformer and the rectifying circuit are alternately conducted, and the working frequencies of the two switching devices are the same.
By adopting the technical scheme, under the driving of the third driving circuit, the switching devices of the rectifying circuit can synchronously work with the switching devices of the leading bridge arm unit and the lagging bridge arm unit so as to rectify the alternating current output by the transformer.
Optionally, the control unit obtains the preset voltage value through an external input mode.
By adopting the technical scheme, the preset voltage value is input from the outside, so that the preset voltage value is convenient to change.
Optionally, when the control unit detects that an error value exists between the output voltage and the preset voltage value, the control unit obtains a control quantity corresponding to the error value through a gain data table to output a control signal.
By adopting the technical scheme, the gain data table can combine the period value and the phase shift value together, so that the direct current converter can simultaneously modulate frequency and phase, and further the gain range of the direct current converter is expanded.
Optionally, the system according to claim 6, wherein: when the output voltage is larger than the preset voltage value, the control quantity is increased; and when the output voltage is smaller than the preset voltage value, the control quantity is reduced.
By adopting the technical scheme, when an error value exists between the output voltage and the preset voltage value, the control quantity can be adjusted according to the relation between the error value and zero, and the adjustment can be convenient.
Optionally, the resonant circuit is an LLC-type resonant cavity.
By adopting the technical scheme, the switching devices of the leading bridge arm unit and the lagging bridge arm unit can be conducted at zero voltage.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the control unit can obtain the output voltage and the preset voltage value and calculate the error value of the output voltage and the preset voltage value so as to output a group of control signals corresponding to the error value. When the driving unit receives a group of control signals, the switching devices of the leading bridge arm unit can be driven to alternately work, the switching devices of the lagging bridge arm unit are driven to alternately work after lagging the switching devices of the leading bridge arm unit, and the constant frequency modulation and the variable frequency modulation can be simultaneously carried out on the direct current converter, so that the gain change range of the direct current converter is expanded.
Drawings
Fig. 1 is a circuit schematic diagram of a dc converter gain modulation system based on digital control in an embodiment of the present application.
Description of reference numerals: 1. an advance bridge arm unit; 2. a lagging bridge arm unit; 3. a rectifying unit; 31. a resonant circuit; 32. a transformer; 321. a primary winding; 322. a secondary winding; 3221. a first winding; 3222. a second winding; 33. a rectifying circuit; 34. a sampling circuit; 4. a drive unit; 41. a first drive circuit; 42. a second drive circuit; 43. a third drive circuit; 5. a control unit; 51. a controller; 511. a current sampling terminal; 512. a voltage sampling terminal; 513. a preset value input end; 52. a gain data table; 6. a reverse diode; 7. and a rectifying diode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses a digital control-based direct current converter gain modulation system, which expands the range of the output voltage of a direct current converter by simultaneously carrying out frequency conversion modulation and fixed frequency modulation on the direct current converter.
Referring to fig. 1, the digital control-based dc converter gain modulation system includes a leading arm unit 1, a lagging arm unit 2, a rectifying unit 3, a driving unit 4, and a control unit 5.
The leading bridge arm unit 1 and the lagging bridge arm unit 2 are connected in parallel, and each of the leading bridge arm unit and the lagging bridge arm unit comprises two switching devices connected in series. The leading bridge arm unit 1 is connected with a direct-current voltage output by a direct-current power supply, and a circuit in which two switching devices M1 and M2 of the leading bridge arm unit 1 and a circuit in which two switching devices M3 and M4 of the lagging bridge arm unit 2 are respectively connected in parallel with the direct-current power supply. By controlling the working states of the four switching devices M1-M4, the common end of the two switching devices M1 and M2 of the leading bridge arm unit 1 and the common end of the two switching devices M3 and M4 of the lagging bridge arm unit 2 can output input voltages with alternating directions, so that inversion is realized. Considering the influence caused by voltage shock in the inversion process, two ends of four switching devices M1-M4 are connected with a reverse diode 6 in parallel. In addition, a capacitor C1 is connected in parallel to the dc current, which has the effects of stabilizing voltage and filtering noise. Wherein, the switching device can be a field effect transistor.
The rectifying unit 3 is connected with the common end of the two switching devices M1 and M2 of the leading arm unit 1 and the common end of the two switching devices M3 and M4 of the following arm unit, and is used for transforming and rectifying the input voltages output by the leading arm unit 1 and the lagging arm unit 2 in alternating directions, and outputting the output voltages within a specified range. The rectifying unit 3 includes a resonance circuit 31, a transformer 32, a rectifying circuit 33, and a sampling circuit 34.
The resonant circuit 31 includes an LLC resonant cavity composed of a resonant inductor Lr, a resonant inductor Lp, and a resonant capacitor Cr. The series resonant inductor Lr, the parallel resonant inductor Lp and the resonant capacitor Cr are connected in series in sequence and are connected to the common end of the two switching devices M1 and M2 of the leading bridge arm unit 1 and the common end of the two switching devices M3 and M4 of the lagging bridge arm unit 2, so that the two switching devices M1 and M2 of the leading bridge arm unit 1 and the two switching devices M3 and M4 of the lagging bridge arm unit 2 can realize zero voltage conduction, and meanwhile, the input voltage can be filtered to remove interference therein so as to output a smoother input voltage.
The transformer 32 is connected to the resonant circuit 31, and includes a primary winding 321 and a secondary winding 322, for adjusting an input voltage connected to the primary winding 321, so that the secondary winding 322 outputs an alternating current of a specified magnitude, where the secondary winding 322 includes a first winding 3221 and a second winding 3222 connected in series. Specifically, the primary winding 321 is connected in parallel to two ends of the parallel resonant inductor Lp, and the dotted end of the second winding 3222 is connected to the dotted end of the first winding 3221.
The rectifying circuit 33 is connected to the secondary winding 322 of the transformer 32, and rectifies the ac power output from the secondary winding 322 so that the ac power is converted into dc power. Specifically, the rectifying circuit 33 is connected in parallel to both ends of the circuit in which the first winding 3221 and the second winding 3222 are located. The rectifying circuit 33 includes two switching devices M5 and M6 connected in series, and a rectifying diode 7 is connected in parallel to the drain terminal and the source terminal of each of the two switching devices M5 and M6. Note that the cathodes of both rectifier diodes 7 are connected to the secondary winding 322.
The rectifying circuit 33 further includes an electrolytic capacitor C2, an anode of the electrolytic capacitor C2 is connected to the common terminal of the first winding 3221 and the second winding 3222, and a cathode thereof is connected to the switching device M6, i.e., to an anode of the rectifying diode 7 connected in parallel to the switching device M6, so as to output a relatively stable and smooth direct current.
In order to keep the output voltage constant, a part of the output voltage may be taken as a reference. Specifically, a current sampling resistor Rs and a load resistor R1 are also provided in series in the circuit, and the circuit in which the current sampling resistor Rs and the load resistor R1 are located is connected in parallel to both ends of the electrolytic capacitor C2.
The sampling circuit 34 is connected to the rectifying circuit 33 for obtaining an output voltage within a specified range, and includes a first resistor R2 and a second resistor R3 connected in series. The first resistor R2 and the second resistor R3 are connected in parallel across the electrolytic capacitor C2, and can output an output voltage within a specified range by means of voltage division.
The leading bridge arm unit 1, the lagging bridge arm unit 2 and the rectifying unit 3 realize the function of converting DC into AC and then converting the AC into DC, and form the LLC resonant DC converter.
The control unit 5 is connected to the rectifying circuit 33, and is configured to detect whether an error value exists between the output voltage and the preset voltage value, and output a set of control signals to control the driving unit 4 to drive the two switching devices M1 and M2 of the leading arm unit 1 and the two switching devices M3 and M4 of the lagging arm unit 2 when an error value exists between the output voltage and the obtained preset voltage value.
The control unit 5 includes a controller 51 and a gain data table 52.
The controller 51 includes three input terminals, namely a current sampling terminal 511, a voltage sampling terminal 512 and a preset value input terminal 513. The current sampling terminal 511 is connected to the common terminal of the current sampling resistor Rs and the load resistor R1 to monitor the flow through the load resistor R1. The voltage sampling terminal 512 is connected to a common terminal of the first resistor R2 and the second resistor R3. It can be appreciated that the end of the second resistor R3 remote from the first resistor R1 is grounded, so that the voltage sampling terminal 512 can acquire the voltage of the second resistor R3. The preset value input 513 may be connected to an external input device, such as a keyboard, to obtain a preset voltage value.
When there is no error value between the output voltage obtained by the voltage sampling terminal 512 and the preset voltage value, the output voltage in the circuit is just the target voltage, i.e. the circuit does not need to be readjusted. When there is an error value between the output voltage obtained by the voltage sampling terminal 512 and the preset voltage value, the controller 51 needs to output a corresponding control amount according to the magnitude of the error value to readjust the circuit.
The gain data table 52 can convert the control quantity into a corresponding set of control signals, which includes a period value and a phase shift value. By controlling the operating frequencies of the two switching devices M1 and M2 of the leading arm unit 1 and the two switching devices M3 and M4 of the lagging arm unit 2, and the phase shift values between the two switching devices M1 and M2 of the leading arm unit 1 and the two switching devices M3 and M4 of the lagging arm unit 2, the output voltage obtained by the voltage sampling terminal 512 is exactly the target voltage. Specifically, two situations can be distinguished: when the output voltage is larger than the preset voltage value, the control quantity is increased, namely the frequency is increased, and the phase shift value is increased; when the output voltage is smaller than the preset voltage value, the control quantity is reduced, namely the frequency is reduced, and the phase shift value is reduced.
In the control unit 5, the controller 51 may be a digital PID controller 51, the gain data table 52 may be obtained by software modeling simulation, and the two may be implemented by a single chip microcomputer to output a set of control signals according to an error value between an output voltage obtained by the voltage sampling terminal 512 and a preset voltage value. It can be understood that the gain data table 52 obtained by software modeling simulation is data obtained by simulation, and there is a certain error between the actual data and the data. Although the gain data table 52 can only be used as reference data, when the output voltage is greater than or less than the preset voltage value, the corresponding relationship between the error value and the control quantity is determined.
The driving unit 4 is connected to the control unit 5, and is configured to drive the two switching devices M1 and M2 of the leading arm unit 1, the two switching devices M3 and M4 of the lagging arm unit 2, and the two switching devices M5 and M6 in the rectifying circuit 33 to turn on or off when receiving a set of control signals, so as to adjust phase shift values between the two switching devices M1 and M2 of the leading arm unit 1 and the two switching devices M3 and M4 of the lagging arm unit 2, and enable the switching devices M5 and M6 to operate synchronously with the switching devices in the leading arm unit 1 and the switching devices in the lagging arm unit 2.
The driving unit 4 includes a first driving circuit 41, a second driving circuit 42 and a third driving circuit 43, the first driving circuit 41 is used for driving the two switching devices M1 and M2 of the leading arm unit 1 to be turned on and off, the second driving circuit 42 is used for driving the two switching devices M3 and M4 of the lagging arm unit 2 to be turned on and off, and the third driving circuit 43 is used for driving the two switching devices M5 and M6 of the rectifying circuit 33, so that the two switching devices M5 and M6 of the rectifying circuit 33 can work synchronously with the two switching devices M1 and M2 of the leading arm unit 1 and the two switching devices M3 and M4 of the lagging arm unit 2.
The first driver circuit 41, the second driver circuit 42 and the third driver circuit 43 each comprise an input and four outputs, the inputs being connected to the data outputs of the gain data table 52. Two output terminals of the first driving circuit 41 are respectively connected to the gate and the source of the switching device M1, and the other two output terminals are respectively connected to the gate and the source of the switching device M2. Accordingly, four output terminals of the second driving circuit 42 are connected to the gates and sources of the switching devices M3 and M4, respectively, and four output terminals of the third driving circuit 43 are connected to the gates and sources of the switching devices M5 and M6, respectively, to control the switching devices to be turned on and off by changing the voltage between the gates and sources of the switching devices.
When the first driving circuit 41 receives a set of control signals, the first driving circuit 41 drives the two switching devices M1 and M2 of the leading bridge arm unit 1 to work complementarily; when the second driving circuit 42 receives a set of control signals, the second driving circuit 42 drives the two switching devices M3 and M4 of the lagging bridge arm unit 2 to work complementarily; when the third driving circuit 43 receives a set of control signals, the third driving circuit 43 drives the two switching devices M5 and M6 in the rectifying circuit 33 to operate complementarily. It can be understood that, since the set of control signals is obtained by correspondingly converting the control quantity, the set of control signals includes corresponding period values and phase shift value data, that is, the set of control signals can control the first driving circuit 41 and the second driving circuit 42 to drive the four switching devices to operate according to corresponding operating frequencies, and make the switching device M3 and the switching device M4 operate after lagging behind the corresponding phase shift values of the switching device M1 and the switching device M2.
It should be noted that, in adjusting the on and off of the switching devices, the phase shift value should be made smaller than the half cycle of the operation of the switching devices, so that the switching devices M1 and M4 can be simultaneously turned on, so that the switching devices M2 and M3 can be simultaneously turned on, and the switching devices M5 and M6 are alternately turned on when the switching devices M1 and M4 are simultaneously turned on and the switching devices M2 and M3 are simultaneously turned on, respectively.
Since circuits for realizing the driving functions of the first driving circuit 41, the second driving circuit 42, and the third driving circuit 43 are well-established technologies, detailed description thereof will not be provided in the embodiments of the present application.
The implementation principle of the digital control-based direct current converter gain modulation system in the embodiment of the application is as follows: by controlling the working frequencies and the phase shifts during working of the two switching devices M1 and M2 of the leading arm unit 1 and the two switching devices M3 and M4 of the lagging arm unit 2, the LLC resonant dc converter can perform gain modulation by means of simultaneous frequency modulation and phase modulation, so as to expand the gain range of the LLC resonant dc converter. The operating frequency and the phase shift value during the adjustment are obtained by the voltage error value detected by the digital PID controller 51 according to the gain data table 52.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (8)
1. A digital control-based direct current converter gain modulation system is characterized in that: the bridge-type three-phase bridge-arm power supply comprises a leading bridge-arm unit (1), a lagging bridge-arm unit (2), a rectifying unit (3), a driving unit (4) and a control unit (5);
the leading bridge arm unit (1) is connected with direct current voltage and comprises two switching devices connected in series;
the lag bridge arm unit (2) is connected with the lead bridge arm in parallel and comprises two switching devices connected in series;
the common ends of the two switching devices of the leading bridge arm unit (1) and the common ends of the two switching devices of the lagging bridge arm unit (2) output input voltages with alternate directions;
the rectifying unit (3) is used for connecting the input voltage to output an output voltage within a specified range;
the control unit (5) is connected with the rectifying unit (3) and is used for detecting whether an error value exists between the connected output voltage and the acquired preset value or not and outputting a group of control signals corresponding to the error value when the error value exists between the output voltage and the preset value;
the driving unit (4) is connected with the control unit (5) and is used for driving the switching devices in the leading bridge arm unit (1) and the lagging bridge arm unit (2) to work complementarily and driving the switching devices in the leading bridge arm unit (1) and the lagging bridge arm unit (2) to work in a staggered mode when receiving a control signal.
2. The digital control based dc converter gain modulation system of claim 1, wherein: the driving unit (4) comprises a first driving circuit (41) and a second driving circuit (42), and the first driving circuit (41) and the second driving circuit (42) are both connected with the control unit (5);
the first driving circuit (41) is used for driving the two switching devices of the leading bridge arm unit (1) to be alternatively conducted;
and the second driving circuit (42) is used for driving the two switching devices of the lagging bridge arm unit (2) to enable the two switching devices to be alternately conducted when the phase difference value exists between the two switching devices of the leading bridge arm unit (1).
3. The digital control based dc converter gain modulation system of claim 2, wherein: the rectifying unit (3) comprises a resonant circuit (31), a transformer (32), a rectifying circuit (33) and a sampling circuit (34);
the resonance circuit (31) is used for filtering the input voltage to output a smoother input voltage;
the transformer (32) is connected with the resonant circuit (31) and is used for transforming the smooth input voltage to output alternating current with a specified size;
the rectifying circuit (33) is connected with the transformer (32) and is used for rectifying the alternating current with the specified size so as to output direct current with the specified size;
the sampling circuit (34) is connected with the rectifying circuit (33) and is used for dividing the direct current with the specified size so as to output the output voltage.
4. The digital control based dc converter gain modulation system of claim 3, wherein: the rectification circuit (33) comprises two switching devices connected in series;
the driving unit (4) further comprises a third driving circuit (43), wherein the third driving circuit (43) is connected with the control unit (5) and is used for synchronously driving the two switching devices in the rectifying circuit (33) when the first driving circuit (41) drives the two switching devices of the leading bridge arm unit (1) and the second driving circuit (42) drives the two switching devices of the lagging bridge arm unit (2), so that the two switching devices in the rectifying circuit (33) are alternately conducted, and the working frequencies of the two switching devices are the same.
5. The digital control based dc converter gain modulation system of claim 1, wherein: the control unit (5) acquires the preset voltage value in an external input mode.
6. The digital control based dc converter gain modulation system of claim 5, wherein: when the control unit (5) detects that an error value exists between the output voltage and the preset voltage value, the control unit (5) obtains a control quantity corresponding to the error value through a gain data table (52) to output a group of control signals.
7. The digital control based dc converter gain modulation system of claim 6, wherein: when the output voltage is larger than the preset voltage value, the control quantity is increased; and when the output voltage is smaller than the preset voltage value, the control quantity is reduced.
8. The digital control based dc converter gain modulation system of claim 3, wherein: the resonant circuit (31) is an LLC resonant cavity.
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