CN109004843B - Voltage control method and device - Google Patents

Voltage control method and device Download PDF

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Publication number
CN109004843B
CN109004843B CN201811038354.XA CN201811038354A CN109004843B CN 109004843 B CN109004843 B CN 109004843B CN 201811038354 A CN201811038354 A CN 201811038354A CN 109004843 B CN109004843 B CN 109004843B
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China
Prior art keywords
control signal
switch
voltage
time
new control
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CN201811038354.XA
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CN109004843A (en
Inventor
曾海峰
莫旭杰
章林
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Shenzhen Tieon Energy Technology Co Ltd
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Shenzhen Tieon Energy Technology Co Ltd
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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
    • 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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The embodiment of the invention provides a voltage control method and device, and relates to the technical field of power electronics. The controller collects the current working voltage of the load and obtains a voltage difference value according to the current working voltage and a reference voltage; the controller obtains a frequency difference value according to the voltage difference value, the preset duration time of each electrifying of the transformer and the input voltage provided by the power supply; the controller adjusts the current frequency of the control signal according to the current working voltage, the reference voltage and the frequency difference value to obtain a new control signal and outputs the new control signal to the phase-shifted full-bridge circuit, so that the phase-shifted full-bridge circuit adjusts the current working voltage of the load into the reference voltage according to the new control signal and the input voltage. The voltage control method provided by the invention controls the working voltage provided by the phase-shifted full-bridge circuit to the load by adjusting the frequency of the control signal, thereby improving the power density and reliability of the phase-shifted full-bridge circuit.

Description

Voltage control method and device
Technical Field
The invention relates to the technical field of power electronics, in particular to a voltage control method and device.
Background
In order to make the power electronic device smaller and lighter, the phase-shifted full-bridge circuit generally adopts a high-switching-frequency constant-frequency phase-shifted control mode to control the output voltage. When the phase-shifted full-bridge circuit adopting constant-frequency phase-shifting control has light load of a transformer, a switching tube in the phase-shifted full-bridge circuit adopting constant-frequency phase-shifting control is difficult to realize zero-voltage switching, and high-frequency control is adopted in constant-frequency phase-shifting control, so that the loss of the switching tube is large, the size of a radiator needs to be increased, and meanwhile, the switching tube has large variable current when being switched on, and can cause large electromagnetic interference to peripheral electric appliances of a power electronic device.
Disclosure of Invention
The invention aims to provide a voltage control method and a voltage control device, wherein the method controls the working voltage provided by a phase-shifted full-bridge circuit to a load by adjusting the frequency of a control signal, and improves the power density and the reliability of the phase-shifted full-bridge circuit.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a voltage control method applied to a power electronic device, where the power electronic device includes a controller, a phase-shifted full-bridge circuit, a load, and a power supply, the controller is electrically connected to the phase-shifted full-bridge circuit and the load, the phase-shifted full-bridge circuit is electrically connected to the load and the power supply, the power supply is configured to provide an input voltage to the phase-shifted full-bridge circuit, the controller is configured to output a control signal to the phase-shifted full-bridge circuit, the phase-shifted full-bridge circuit is configured to provide a working voltage to the load according to the control signal and the input voltage, the phase-shifted full-bridge circuit includes a transformer, and the method includes: the controller collects the current working voltage of the load; the controller obtains a voltage difference value according to the current working voltage and a reference voltage; the controller obtains a frequency difference value according to the voltage difference value, the preset duration time of the transformer during each power-on and the input voltage; and the controller adjusts the current frequency of the control signal according to the current working voltage, the reference voltage and the frequency difference value to obtain a new control signal and output the new control signal to the phase-shifted full-bridge circuit, so that the phase-shifted full-bridge circuit adjusts the current working voltage of the load into the reference voltage according to the new control signal and the input voltage.
In a second aspect, an embodiment of the present invention further provides a voltage control device, which is applied to a power electronic device, where the power electronic device includes a controller, a phase-shifted full-bridge circuit, a load, and a power supply, the controller is electrically connected to the phase-shifted full-bridge circuit and the load, the phase-shifted full-bridge circuit is electrically connected to the load and the power supply, the power supply is configured to provide an input voltage to the phase-shifted full-bridge circuit, the controller is configured to output a control signal to the phase-shifted full-bridge circuit, the phase-shifted full-bridge circuit is configured to provide a working voltage to the load according to the control signal and the input voltage, the phase-shifted full-bridge circuit includes a transformer, and the device includes: the acquisition unit is used for acquiring the current working voltage of the load; the first calculation unit is used for obtaining a voltage difference value according to the current working voltage and a reference voltage; the second calculating unit is used for obtaining a frequency difference value according to the voltage difference value, the preset duration time of the transformer during each electrifying and the input voltage; and the frequency adjusting unit is used for adjusting the current frequency of the control signal according to the current working voltage, the reference voltage and the frequency difference value to obtain a new control signal and outputting the new control signal to the phase-shifted full-bridge circuit, so that the phase-shifted full-bridge circuit adjusts the current working voltage of the load into the reference voltage according to the new control signal and the input voltage.
The embodiment of the invention provides a voltage control method and a voltage control device, which are applied to a power electronic device, wherein the power electronic device comprises a controller, a phase-shifted full-bridge circuit, a load and a power supply, the controller is electrically connected with the phase-shifted full-bridge circuit and the load, the phase-shifted full-bridge circuit is electrically connected with the load and the power supply, and the phase-shifted full-bridge circuit comprises a transformer; the method comprises the following steps: the controller collects the current working voltage of the load; the controller obtains a voltage difference value according to the current working voltage and a reference voltage; the controller obtains a frequency difference value according to the voltage difference value, the preset duration time of the transformer when the transformer is electrified every time and the input voltage; the controller adjusts the current frequency of the control signal according to the current working voltage, the reference voltage and the frequency difference value to obtain a new control signal and outputs the new control signal to the phase-shifted full-bridge circuit, so that the phase-shifted full-bridge circuit adjusts the current working voltage of the load into the reference voltage according to the new control signal and the input voltage. Therefore, when the current working voltage of the load changes, the controller adjusts the current frequency of the control signal without changing the preset duration of the transformer when the transformer is electrified, and then adjusts the duty ratio of the preset duration of the transformer when the transformer is electrified so as to control the current working voltage of the load to be equal to the reference voltage, so that the working voltage output by the phase-shifted full-bridge circuit is more stable, and the reliability, the power density and the efficiency of the phase-shifted full-bridge circuit are improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram illustrating a power electronic device according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a voltage control method according to an embodiment of the present invention;
FIG. 3 illustrates a control schematic of a controller provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a voltage control apparatus according to an embodiment of the present invention.
Icon: 1-a power electronic device; 10-a controller; 20-a phase-shifted full bridge circuit; 30-a power supply; 40-a voltage control device; 41-a collecting unit; 42-a first calculation unit; 43-a second calculation unit; 44-a frequency adjustment unit; r0-load; VT1 — first switch; VT2 — second switch; VT3 — third switch; VT 4-fourth switch; a T-transformer; VD 1-first diode; VD2 — second diode; VD3 — third diode; VD4 — fourth diode; VD5 — fifth diode; VD6 — sixth diode; c1 — first capacitance; c2 — second capacitance; c3 — third capacitance; c4-fourth capacitance; c0 — fifth capacitance; lr-first inductance; l1 — second inductance; l2-third inductance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, a block diagram of a power electronic device 1 provided in an embodiment of the present invention is a structural diagram of the power electronic device 1, where the power electronic device 1 includes a controller 10, a phase-shifted full-bridge circuit 20, a load R0, and a power supply 30, the controller 10 is electrically connected to the phase-shifted full-bridge circuit 20 and the load R0, the phase-shifted full-bridge circuit 20 is electrically connected to the load R0 and the power supply 30, the power supply 30 is configured to provide an input voltage to the phase-shifted full-bridge circuit 20, the controller 10 is configured to output a control signal to the phase-shifted full-bridge circuit 20, and the phase-shifted full-bridge circuit 20 is configured to provide an operating voltage to the load R0 according to the control signal.
The phase-shifted full-bridge circuit 20 comprises a transformer T, a first switch VT1, a second switch VT2, a third switch VT3 and a fourth switch VT4, wherein the first switch VT1 is electrically connected with the second switch VT2 and the third switch VT3, the fourth switch VT4 is electrically connected with the second switch VT2 and the third switch VT3, the controller 10 and the power supply 30 are electrically connected with the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT4 respectively, the transformer T comprises a primary coil, one end of the primary coil is electrically connected between the first switch VT1 and the second switch VT2, and the other end of the primary coil is electrically connected between the third switch 3 and the fourth switch VT 4.
In this embodiment, the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT4 may all adopt a power transistor. It is understood that the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT4 may all be implemented as power transistors or P-channel fets, wherein the drain of the first switch VT1 is electrically connected to one end of the power supply 30 and the drain of the third switch VT3, the gate of the first switch VT1 is electrically connected to the controller 10, the source of the first switch VT1 is electrically connected to the drain of the second switch VT2 and one end of the primary coil, the drain of the second switch VT2 is electrically connected to one end of the primary coil, the gate of the second switch VT2 is electrically connected to the controller 10, the source of the second switch VT2 is electrically connected to the other end of the power supply 30 and the source of the fourth switch VT4, the drain of the third switch VT3 is electrically connected to one end of the power supply 30, the gate of the third switch VT3 is electrically connected to the controller 10, the source of the third switch VT3 is electrically connected to the other end of the primary coil and the drain of the fourth switch VT4, the drain of the fourth switch VT4 is electrically connected to the other end of the primary coil, the gate of the fourth switch VT4 is electrically connected to the controller 10, and the source of the fourth switch VT4 is electrically connected to the other end of the power supply 30.
Further, in this embodiment, the phase-shifted full-bridge circuit 20 further includes a first diode VD1, a second diode VD2, a third diode VD3, a fourth diode VD4, a fifth diode VD5, a sixth diode VD6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C0, a first inductor Lr, a second inductor L1, and a third inductor L2, the transformer T further includes a secondary coil, a cathode of the first diode VD1 is electrically connected to a drain of the first switch VT1 and one end of the first capacitor C1, an anode of the first diode VD1 is electrically connected to a source of the first switch VT1, the other end of the first capacitor C1, and one end of the first inductor Lr are electrically connected, a cathode of the second diode VD2 is electrically connected to a drain of the second switch VT2, one end of the second capacitor C2, one end of the first inductor L2, and an anode of the second diode VD2 is electrically connected to a source of the second switch VT2, The other ends of the second capacitors C2 are electrically connected, the cathode of the third diode VD3 is electrically connected to the drain of the third switch VT3 and one end of the third capacitor C3, the anode of the third diode VD3 is electrically connected to the source of the third switch VT3 and the other end of the third capacitor C3, the cathode of the fourth diode VD4 is electrically connected to the drain of the fourth switch VT4 and one end of the fourth capacitor C4, the anode of the fourth diode VD4 is electrically connected to the source of the fourth switch VT4 and the other end of the fourth capacitor C4, the other end of the first inductor Lr is electrically connected to one end of the primary coil, one end of the secondary coil is electrically connected to the cathode of the fifth diode VD5 and one end of the second inductor L1, the other end of the secondary coil is electrically connected to the cathode of the sixth diode VD6 and one end of the third inductor L2, the anode of the fifth diode VD5 is electrically connected to the anode of the sixth diode VD6 and one end of the fifth capacitor C0, One end of a load R0 is electrically connected, the anode of a sixth diode VD6 is electrically connected with one end of a fifth capacitor C0 and one end of a load R0, the other end of a second inductor L1 is electrically connected with the other end of a third inductor L2, the other end of a fifth capacitor C0 and the other end of a load R0, the other end of the third inductor L2 is electrically connected with the other end of a fifth capacitor C0 and the other end of the load R0, one end of a fifth capacitor C0 is electrically connected with one end of the load R0, and the other end of a fifth capacitor C0 is electrically connected with the other end of the load R0.
In the embodiment, the first diode VD1, the second diode VD2, the third diode VD3, and the fourth diode VD4 may all adopt power body diodes; the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 can adopt power tube junction capacitors; the fifth diode VD5 and the sixth diode VD6 can adopt rectifier tubes; the second inductor L1 and the third inductor L2 may both be filter capacitors; the fifth capacitor C0 may be a filter capacitor; the controller 10 may employ a Digital Signal Processor (DSP); the power supply 30 may employ a dc power supply 30.
Fig. 2 is a schematic flow chart of a voltage control method according to an embodiment of the present invention. It should be noted that the voltage control method according to the embodiment of the present invention is not limited by the specific sequence shown in fig. 2 and described below. It should be understood that in other embodiments, the order of some steps in the voltage control method according to the present invention may be interchanged according to actual needs, or some steps may be omitted or deleted. The voltage control method can be applied to the power electronic device 1, and the specific flow shown in fig. 2 will be described in detail below.
In step S101, the controller 10 collects the current working voltage of the load R0.
In this embodiment, the controller 10 collects the current operating voltage across the load R0 (i.e., the operating voltage provided by the phase-shifted full-bridge circuit 20 to the load R0). The current working voltage across the load R0 will change when the input voltage provided by the power supply 30 changes, and if the input voltage increases, the current working voltage will also increase accordingly; the current working voltage across the load R0 also changes correspondingly when the impedance of the load R0 changes, the impedance of the load R0 increases correspondingly when the load is light, the current working voltage across the load R0 also increases correspondingly when the load is heavy, the impedance of the load R0 decreases correspondingly when the load is heavy, and the current working voltage across the load R0 also decreases correspondingly.
Step S102, the controller 10 obtains a voltage difference according to the current working voltage and a reference voltage.
In this embodiment, the controller 10 subtracts the current working voltage from a reference voltage to obtain a voltage difference, where the reference voltage is a working voltage value normally output when the phase-shifted full-bridge circuit 20 is designed, that is, a working voltage required when the load R0 normally works.
In step S103, the controller 10 obtains a frequency difference according to the voltage difference, a preset duration of each time the transformer T is powered on, and the input voltage.
In the present embodiment, the controller 10 depends on a formulaCalculating the frequency difference, wherein Δ V0Representing said voltage difference, Tuf representing said preset duration, af representing said frequency difference, U1Representing the input voltage, a represents the turns ratio of the transformer T.
In this embodiment, the controller 10 substitutes the voltage difference calculated in step S102 into the above formula to obtain a frequency difference, where the preset duration of each time the transformer T is powered on is a constant set in advance, the input voltage is a constant set when the phase-shifted full-bridge circuit 20 is designed, and the turn ratio of the transformer T is also a constant set when the phase-shifted full-bridge circuit 20 is designed.
Step S104, the controller 10 adjusts the current frequency of the control signal according to the current working voltage, the reference voltage and the frequency difference to obtain a new control signal, and outputs the new control signal to the phase-shifted full-bridge circuit 20, so that the phase-shifted full-bridge circuit 20 adjusts the current working voltage of the load R0 to the reference voltage according to the new control signal and the input voltage.
In this embodiment, the control signals include a first control signal, a second control signal, a third control signal and a fourth control signal, and the first control signal, the second control signal, the third control signal and the fourth control signal are respectively used for controlling the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT 4.
It is understood that the controller 10 adjusts the current frequencies of the first control signal, the second control signal, the third control signal and the fourth control signal according to the current operating voltage, the reference voltage and the frequency difference, respectively, to obtain a first new control signal, a second new control signal, a third new control signal and a fourth new control signal, and outputs the first new control signal, the second new control signal, the third new control signal and the fourth new control signal to the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT4, respectively.
As shown in fig. 3, the control schematic diagram of the controller 10 is shown, the first control signal includes a first initial on-time t0 of the first switch VT1 in a current switching cycle, the second control signal includes a second initial on-time t2 of the second switch VT2 in the switching cycle, the third control signal includes a first terminal on-time t7 of the third switch VT3 in the switching cycle, and the fourth control signal includes a second terminal on-time t5 of the fourth switch VT4 in the switching cycle.
Further, the first control signal further includes a third termination conducting time t1 of the first switch VT1 in the switching cycle, the second control signal further includes a fourth termination conducting time t3 of the second switch VT2 in the switching cycle, the third control signal further includes a third initial conducting time t6 of the third switch VT3 in the switching cycle, and the fourth control signal further includes a fourth initial conducting time t4 of the fourth switch VT4 in the switching cycle.
It can be understood that the time when the first switch VT1 and the fourth switch VT4 are simultaneously turned on or the time when the second switch VT2 and the third switch VT3 are simultaneously turned on is the preset duration of each time the transformer T is powered on, i.e. the time difference between the third ending conducting time T1 and the fourth initial conducting time T4 or the time difference between the fourth ending conducting time T3 and the third initial conducting time T6 is the preset duration of each time the transformer T is powered on. The time when the first switch VT1 and the second switch VT2 are simultaneously turned off or the time when the third switch VT3 and the fourth switch VT4 are simultaneously turned off is a dead time, i.e., a time difference between the second initial on-time t2 and the third off-on-time t1 or a time difference between the third initial on-time t6 and the second off-on-time t5 is the dead time. The time difference between the first initial on-time t0 of the first switch VT1 and the second initial on-time t2 of the second switch VT2 is half of the switching cycle, the time difference between the first initial on-time t0 of the first switch VT1 and the fourth initial on-time t4 of the fourth switch VT4 is half of the switching cycle and the preset duration and the dead time difference, and the time difference between the third initial on-time t6 of the third switch VT3 and the fourth initial on-time t4 of the fourth switch VT4 is half of the switching cycle.
In the present embodiment, the first switch VT1 is in a conducting state in the time difference between the third termination conducting time T1 and the first initial conducting time T0, the second switch VT2 is in a conducting state in the time difference between the fourth termination conducting time T3 and the second initial conducting time T2, the third switch VT3 is in a conducting state in the time difference between the first termination conducting time T7 and the third initial conducting time T6, the fourth switch VT4 is in a conducting state in the time difference between the second termination conducting time T5 and the fourth initial conducting time T4, the transformer T is in a conducting state in the time when the first switch VT1 and the fourth switch VT4 are simultaneously conducted, that is, the input voltage provided by the power supply 30 flows to the primary winding of the transformer T through the first switch VT1, and then flows back to the power supply 30 through the fourth switch 4; or the transformer T is in the power-on state during the time when the second switch VT2 and the third switch VT3 are turned on simultaneously, i.e., the input voltage provided by the power supply 30 flows to the primary coil of the transformer T through the third switch VT3, and then flows back to the power supply 30 from the primary coil through the second switch VT 2.
The step S104 specifically includes: the controller 10 obtains a period difference value according to the frequency difference value; the controller 10 adjusts the first initial on-time t0 and the second initial on-time t2 according to the current working voltage, the reference voltage, and the period difference, and further adjusts the current frequencies of the first control signal and the second control signal to obtain the first new control signal and the second new control signal, and adjusts the first off-time t7 and the second off-time t5 according to the current working voltage, the reference voltage, and the period difference, and further adjusts the current frequencies of the third control signal and the fourth control signal to obtain the third new control signal and the fourth new control signal.
It is understood that, when the current operating voltage is greater than the reference voltage, the controller 10 advances the first initial on-time t0 and the second initial on-time t2 according to the period difference, so as to decrease the current frequencies of the first control signal and the second control signal, obtain the first new control signal and the second new control signal, and delays the first termination on-time t7 and the second termination on-time t5 according to the period difference, so as to decrease the current frequencies of the third control signal and the fourth control signal. When the current working voltage is lower than the reference voltage, the controller 10 delays the first initial on-time t0 and the second initial on-time t2 according to the period difference, further increases the current frequencies of the first control signal and the second control signal, obtains the first new control signal and the second new control signal, and advances the first termination on-time t7 and the second termination on-time t5 according to the period difference, further increases the current frequencies of the third control signal and the fourth control signal.
In this embodiment, when the current operating voltage is greater than the reference voltage, the voltage difference is obtained according to step S102, the frequency difference is obtained according to step S103, the frequency difference is reciprocal to obtain a period difference, the controller 10 advances the first initial on-time t0 of the first control signal and the second initial on-time t2 of the second control signal by half of the period difference, and delays the first off-time t7 of the third control signal and the second off-time t5 of the fourth control signal by half of the period difference, and the controller 10 keeps the third off-time t1 of the first control signal, the fourth off-time t3 of the second control signal, the third initial on-time t6 of the third control signal, and the fourth initial on-time t4 of the fourth control signal constant, thereby increasing the first control signal, The current periods of the second control signal, the third control signal and the fourth control signal are reduced so as to reduce the current frequencies of the first control signal, the second control signal, the third control signal and the fourth control signal, and the first new control signal, the second new control signal, the third new control signal and the fourth new control signal are obtained according to the time difference relationship between the first initial on-time t0 of the first control signal and the second initial on-time t2 of the second control signal, the time difference relationship between the first initial on-time t0 of the first control signal and the fourth initial on-time t4 of the fourth control signal, and the time difference relationship between the fourth initial on-time t4 of the fourth control signal and the third initial on-time t6 of the third control signal.
The switching period in the time difference relationship between the first initial on-time t0 of the first control signal and the second initial on-time t2 of the second control signal, the time difference relationship between the first initial on-time t0 of the first control signal and the fourth initial on-time t4 of the fourth control signal, and the time difference relationship between the fourth initial on-time t4 of the fourth control signal and the third initial on-time t6 of the third control signal varies in real time according to the period difference.
It can be seen that, in this embodiment, when the current working voltage at the two ends of the load R0 changes, the controller 10 can change the duty ratios of the on-times of the first switch VT1, the second switch VT2, the third switch VT3, and the fourth switch VT4 by adjusting the change of the frequency of the control signal, so as to control the output working voltage to be consistent with the reference voltage, thereby improving the power density and reliability of the phase-shifted full bridge circuit 20; during light load, the current working voltage at two ends of the load R0 is increased, and the controller 10 adjusts the frequency of the control signal to decrease, so as to decrease the duty ratios of the on-times of the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT4, so that the increased current working voltage is decreased to the reference voltage, in this process, the switching losses of the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT4 are decreased when the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT4 are operated at a relatively low switching frequency, so that the heat generated by the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT4 is decreased, so as to decrease the volume of the heat sink, and reduce the cost of the power electronic device and the difficulty of thermal design.
Fig. 4 is a schematic diagram of functional modules of a voltage control apparatus 40 according to an embodiment of the present invention. It should be noted that the basic principle and the generated technical effect of the voltage control apparatus 40 provided in the present embodiment are the same as those of the foregoing method embodiments, and for a brief description, the corresponding contents in the foregoing method embodiments may be referred to for the parts not mentioned in the present embodiment. The voltage control device 40 is applicable to the power electronic device 1, and includes a collecting unit 41, a first calculating unit 42, a second calculating unit 43, and a frequency adjusting unit 44.
It is understood that the above-mentioned acquisition unit 41, the first calculation unit 42, the second calculation unit 43 and the frequency adjustment unit 44 may be software functional modules and computer programs stored in a memory, and may be executed by the controller 10.
The collecting unit 41 is configured to collect a current operating voltage of the load R0.
It is understood that the acquiring unit 41 may perform the step S101.
The first calculating unit 42 is configured to obtain a voltage difference according to the current working voltage and a reference voltage.
It is understood that the first calculating unit 42 may perform the above step S102.
The second calculating unit 43 is configured to obtain a frequency difference according to the voltage difference, a preset duration of each time the transformer T is powered on, and the input voltage.
It is understood that the second calculation unit 43 may perform the above step S103.
The frequency adjusting unit 44 is configured to adjust the current frequency of the control signal according to the current working voltage, the reference voltage, and the frequency difference to obtain a new control signal, and output the new control signal to the phase-shifted full-bridge circuit 20, so that the phase-shifted full-bridge circuit 20 adjusts the current working voltage of the load R0 to the reference voltage according to the new control signal and the input voltage.
It is understood that the frequency adjusting unit 44 is configured to adjust the current frequencies of the first control signal, the second control signal, the third control signal and the fourth control signal according to the current operating voltage, the reference voltage and the frequency difference, respectively, to obtain a first new control signal, a second new control signal, a third new control signal and a fourth new control signal, and output the first new control signal, the second new control signal, the third new control signal and the fourth new control signal to the first switch VT1, the second switch VT2, the third switch VT3 and the fourth switch VT4, respectively.
In this embodiment, the frequency adjusting unit 44 includes a period calculating subunit and a period adjusting subunit, and the period calculating subunit is configured to obtain a period difference value according to the frequency difference value; the period adjusting subunit is configured to adjust the first initial on-time and the second initial on-time according to the current working voltage, the reference voltage, and the period difference, and further adjust the current frequencies of the first control signal and the second control signal to obtain the first new control signal and the second new control signal, and adjust the first on-time termination and the second on-time termination according to the current working voltage, the reference voltage, and the period difference, and further adjust the current frequencies of the third control signal and the fourth control signal to obtain the third new control signal and the fourth new control signal.
It is understood that the frequency adjustment unit 44 may perform the above step S104.
In summary, the voltage control method and device provided by the embodiments of the present invention are applied to a power electronic device, where the power electronic device includes a controller, a phase-shifted full-bridge circuit, a load, and a power supply, the controller is electrically connected to the phase-shifted full-bridge circuit and the load, the phase-shifted full-bridge circuit is electrically connected to the load and the power supply, and the phase-shifted full-bridge circuit includes a transformer; the method comprises the following steps: the controller collects the current working voltage of the load; the controller obtains a voltage difference value according to the current working voltage and a reference voltage; the controller obtains a frequency difference value according to the voltage difference value, the preset duration time of the transformer when the transformer is electrified every time and the input voltage; the controller adjusts the current frequency of the control signal according to the current working voltage, the reference voltage and the frequency difference value to obtain a new control signal and outputs the new control signal to the phase-shifted full-bridge circuit, so that the phase-shifted full-bridge circuit adjusts the current working voltage of the load into the reference voltage according to the new control signal and the input voltage. Therefore, when the current working voltage of the load changes, the controller adjusts the current frequency of the control signal without changing the preset duration of the transformer when the transformer is electrified, and then adjusts the duty ratio of the preset duration of the transformer when the transformer is electrified so as to control the current working voltage of the load to be equal to the reference voltage, so that the working voltage output by the phase-shifted full-bridge circuit is more stable, and the reliability, the power density and the efficiency of the phase-shifted full-bridge circuit are improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Claims (8)

1. The utility model provides a voltage control method, its characterized in that is applied to power electronic device, power electronic device includes controller, phase-shifted full-bridge circuit, load and power, the controller with phase-shifted full-bridge circuit the load is all connected electrically, phase-shifted full-bridge circuit with the load, the power is all connected electrically, the power is used for to phase-shifted full-bridge circuit provides input voltage, the controller is used for to phase-shifted full-bridge circuit output control signal, phase-shifted full-bridge circuit is used for according to control signal and input voltage for the load provides operating voltage, phase-shifted full-bridge circuit includes the transformer, the method includes:
the controller collects the current working voltage of the load;
the controller obtains a voltage difference value according to the current working voltage and a reference voltage;
the controller is used for controlling the voltage difference value according to the voltage difference valueThe preset duration time of the transformer when being electrified every time and the input voltage are according to a formulaCalculating a difference in frequency, where Δ V0Representing said voltage difference, Tuf representing said preset duration, af representing said frequency difference, U1Representing the input voltage, a representing a turns ratio of the transformer;
and the controller adjusts the current frequency of the control signal according to the current working voltage, the reference voltage and the frequency difference value to obtain a new control signal and output the new control signal to the phase-shifted full-bridge circuit, so that the phase-shifted full-bridge circuit adjusts the current working voltage of the load into the reference voltage according to the new control signal and the input voltage.
2. The voltage control method of claim 1, wherein the phase-shifted full-bridge circuit comprises a first switch, a second switch, a third switch, and a fourth switch, the first switch is electrically connected to the second switch and the third switch, the fourth switch is electrically connected to the second switch and the third switch, the controller and the power source are electrically connected to the first switch, the second switch, the third switch, and the fourth switch, respectively, the transformer comprises a primary coil, one end of the primary coil is electrically connected between the first switch and the second switch, and the other end of the primary coil is electrically connected between the third switch and the fourth switch; the control signal comprises a first control signal, a second control signal, a third control signal and a fourth control signal, the first control signal, the second control signal, the third control signal and the fourth control signal are respectively used for controlling the first switch, the second switch, the third switch and the fourth switch, the controller adjusts the current frequency of the control signal according to the current working voltage, the reference voltage and the frequency difference value to obtain a new control signal and output the new control signal to the full-bridge phase shift circuit, and the step of:
the controller respectively adjusts the current frequencies of the first control signal, the second control signal, the third control signal and the fourth control signal according to the current working voltage, the reference voltage and the frequency difference value to obtain a first new control signal, a second new control signal, a third new control signal and a fourth new control signal, and respectively outputs the first new control signal, the second new control signal, the third new control signal and the fourth new control signal to the first switch, the second switch, the third switch and the fourth switch.
3. The voltage control method of claim 2, wherein the first control signal comprises a first initial on-time of the first switch in a current one of the switching cycles, the second control signal comprises a second initial on-time of the second switch in the switching cycle, the third control signal comprises a first terminal on-time of the third switch in the switching cycle, and the fourth control signal comprises a second terminal on-time of the fourth switch in the switching cycle; the step of the controller adjusting the current frequencies of the first control signal, the second control signal, the third control signal and the fourth control signal respectively according to the current working voltage, the reference voltage and the frequency difference to obtain a first new control signal, a second new control signal, a third new control signal and a fourth new control signal, and outputting the first new control signal, the second new control signal, the third new control signal and the fourth new control signal to the first switch, the second switch, the third switch and the fourth switch respectively includes:
the controller obtains a period difference value according to the frequency difference value;
the controller respectively adjusts the first initial conduction time and the second initial conduction time according to the current working voltage, the reference voltage and the period difference value, further adjusts the current frequency of the first control signal and the second control signal, obtains the first new control signal and the second new control signal, respectively adjusts the first termination conduction time and the second termination conduction time according to the current working voltage, the reference voltage and the period difference value, further adjusts the current frequency of the third control signal and the fourth control signal, and obtains the third new control signal and the fourth new control signal.
4. The voltage control method according to claim 3, wherein the step of the controller adjusting the first initial on-time and the second initial on-time according to the current operating voltage, the reference voltage and the period difference, respectively, to adjust the current frequencies of the first control signal and the second control signal, to obtain the first new control signal and the second new control signal, and adjusting the first on-time termination and the second on-time termination according to the current operating voltage, the reference voltage and the period difference, respectively, to adjust the current frequencies of the third control signal and the fourth control signal, to obtain the third new control signal and the fourth new control signal comprises:
when the current working voltage is greater than the reference voltage, the controller advances the first initial conduction time and the second initial conduction time according to the period difference value so as to reduce the current frequency of the first control signal and the second control signal to obtain a first new control signal and a second new control signal, and delays the first termination conduction time and the second termination conduction time according to the period difference value so as to reduce the current frequency of the third control signal and the fourth control signal;
when the current working voltage is lower than the reference voltage, the controller delays the first initial conduction time and the second initial conduction time according to the period difference value so as to increase the current frequency of the first control signal and the second control signal to obtain a first new control signal and a second new control signal, and advances the first termination conduction time and the second termination conduction time according to the period difference value so as to increase the current frequency of the third control signal and the fourth control signal.
5. The utility model provides a voltage control device, its characterized in that is applied to power electronic device, power electronic device includes controller, phase-shift full-bridge circuit, load and power, the controller with phase-shift full-bridge circuit the load is all connected electrically, phase-shift full-bridge circuit with the load the power is all connected electrically, the power be used for to phase-shift full-bridge circuit provides input voltage, the controller be used for to phase-shift full-bridge circuit output control signal, phase-shift full-bridge circuit be used for according to control signal and input voltage do the load provides operating voltage, phase-shift full-bridge circuit includes the transformer, the device includes:
the acquisition unit is used for acquiring the current working voltage of the load;
the first calculation unit is used for obtaining a voltage difference value according to the current working voltage and a reference voltage;
a second calculating unit for calculating the voltage difference value, the preset duration time of the transformer in each power-on and the input voltage according to a formulaCalculating a difference in frequency, where Δ V0Representing said voltage difference, Tuf representing said preset duration, af representing said frequency difference, U1Representing the input voltage, a representing a turns ratio of the transformer;
and the frequency adjusting unit is used for adjusting the current frequency of the control signal according to the current working voltage, the reference voltage and the frequency difference value to obtain a new control signal and outputting the new control signal to the phase-shifted full-bridge circuit, so that the phase-shifted full-bridge circuit adjusts the current working voltage of the load into the reference voltage according to the new control signal and the input voltage.
6. The voltage control apparatus of claim 5, wherein the phase-shifted full-bridge circuit comprises a first switch, a second switch, a third switch, and a fourth switch, the first switch electrically connected to the second switch and the third switch, the fourth switch electrically connected to the second switch and the third switch, the controller and the power source electrically connected to the first switch, the second switch, the third switch, and the fourth switch, respectively, the transformer comprising a primary coil, one end of the primary coil electrically connected between the first switch and the second switch, and the other end of the primary coil electrically connected between the third switch and the fourth switch; the control signals include a first control signal, a second control signal, a third control signal and a fourth control signal, and the first control signal, the second control signal, the third control signal and the fourth control signal are respectively used for controlling the first switch, the second switch, the third switch and the fourth switch;
the frequency adjusting unit is configured to adjust current frequencies of the first control signal, the second control signal, the third control signal, and the fourth control signal according to the current working voltage, the reference voltage, and the frequency difference, so as to obtain a first new control signal, a second new control signal, a third new control signal, and a fourth new control signal, and output the first new control signal, the second new control signal, the third new control signal, and the fourth new control signal to the first switch, the second switch, the third switch, and the fourth switch, respectively.
7. The voltage control apparatus of claim 6, wherein the first control signal comprises a first initial on-time of the first switch in a current switching period, the second control signal comprises a second initial on-time of the second switch in the switching period, the third control signal comprises a first final on-time of the third switch in the switching period, and the fourth control signal comprises a second final on-time of the fourth switch in the switching period, the frequency adjustment unit comprising:
the period calculating subunit is used for obtaining a period difference value according to the frequency difference value;
and a period adjusting subunit, configured to adjust the first initial on-time and the second initial on-time according to the current working voltage, the reference voltage, and the period difference, and further adjust current frequencies of the first control signal and the second control signal to obtain the first new control signal and the second new control signal, and adjust the first on-time termination and the second on-time termination according to the current working voltage, the reference voltage, and the period difference, and further adjust current frequencies of the third control signal and the fourth control signal to obtain the third new control signal and the fourth new control signal.
8. The voltage control apparatus according to claim 7, wherein the period adjustment subunit is configured to, when the current operating voltage is greater than the reference voltage, advance the first initial on-time and the second initial on-time according to the period difference, so as to decrease current frequencies of the first control signal and the second control signal, obtain the first new control signal and the second new control signal, and delay the first termination on-time and the second termination on-time according to the period difference, so as to decrease current frequencies of the third control signal and the fourth control signal;
the period adjusting subunit is further configured to, when the current working voltage is smaller than the reference voltage, delay the first initial on-time and the second initial on-time according to the period difference, further increase current frequencies of the first control signal and the second control signal, obtain the first new control signal and the second new control signal, and advance the first on-time termination and the second on-time termination according to the period difference, further increase current frequencies of the third control signal and the fourth control signal.
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