CN109462334B - DC/DC bidirectional inverter circuit and control method thereof - Google Patents
DC/DC bidirectional inverter circuit and control method thereof Download PDFInfo
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- CN109462334B CN109462334B CN201811293078.1A CN201811293078A CN109462334B CN 109462334 B CN109462334 B CN 109462334B CN 201811293078 A CN201811293078 A CN 201811293078A CN 109462334 B CN109462334 B CN 109462334B
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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Abstract
The invention provides a DC/DC bidirectional inverter circuit and a control method thereof, wherein the inverter circuit comprises a Buck/Boost circuit, an input/output voltage and current isolation sampling circuit, a PWM logic control circuit and a signal interlocking and driving circuit; the Buck/Boost circuit comprises a first main power tube and a second main power tube, and the first main power tube and the second main power tube are conducted in turn under the control of the PWM logic control circuit, so that direct-current voltages at the P end and the N end and energy in the energy storage module are converted mutually; the input/output voltage and current isolation sampling circuit is used for realizing isolation sampling and transmission of input and output signals of the Buck/Boost circuit; the PWM logic control circuit is used for completing closed-loop control on the Buck/Boost circuit; the signal interlocking and driving circuit is used for realizing strong current isolation of the Buck/Boost circuit and control of a first main power tube and a second main power tube of the Buck/Boost circuit, and improving the driving capability and the logic interlocking function of PWM wave signals. The invention can realize the conversion of high-power high-low voltage energy, and has less power devices and low cost.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a DC/DC bidirectional inverter circuit and a control method thereof.
Background
In the current commercial DC/DC bidirectional inverter, in the conversion process of converting low voltage into high voltage output, in order to obtain higher output voltage and boosting ratio, a topological architecture of an interleaving mode and a multiple interleaving mode is generally adopted by a DC/DC bidirectional inverter with higher power to complete bidirectional transfer of energy, but in the mode of converting high voltage into low voltage output, the conduction duty ratio of a power device is relatively smaller, the duty ratio is obviously smaller by using the interleaving mode at this time, a plurality of switching devices and inductive devices are arranged in the interleaving mode, relative switching loss is also large, under the condition of multiple applications, such as when a frequency converter is used in elevator lifting, a P and N direct current bus terminals can generate a very high voltage in the braking process of a main shaft servo driving unit, and a simple device is needed to store the energy at this time, and when the bus voltage is proper, the power is fed back to the bus terminal to absorb the energy of the bus voltage and smooth the bus voltage, but the interleaving mode has more power devices, high cost, complex power circuit conversion and low utilization rate.
Disclosure of Invention
The invention aims to provide a DC/DC bidirectional inverter circuit and a control method thereof, and aims to solve the problems of more power devices, complex power circuit conversion and high cost of the conventional inverter circuit.
The invention is realized by the following steps:
on one hand, the invention provides a DC/DC bidirectional inverter circuit, which comprises a Buck/Boost circuit, an input/output voltage and current isolation sampling circuit, a PWM logic control circuit and a signal interlocking and driving circuit;
the Buck/Boost circuit comprises a first main power tube and a second main power tube, wherein one side of the Buck/Boost circuit is used for being connected with external P and N bus ends, the other side of the Buck/Boost circuit is used for being connected with an energy storage module, and the first main power tube and the second main power tube are conducted in turn under the control of the PWM logic control circuit, so that direct-current voltages of the P and N ends and energy in the energy storage module are converted with each other;
the input end of the input/output voltage and current isolation sampling circuit is connected to the output end of the Buck/Boost circuit, and the output end of the input/output voltage and current isolation sampling circuit is connected to the input end of the PWM logic control circuit and is used for realizing isolation sampling and transmission of input and output signals of the Buck/Boost circuit;
the output end of the PWM logic control circuit is connected to the input end of the signal interlocking and driving circuit and is used for controlling the first main power tube and the second main power tube to be conducted in turn so as to complete closed-loop control of the Buck/Boost circuit;
the input end of the signal interlocking and driving circuit is connected to the output end of the PWM logic control circuit, the output end of the signal interlocking and driving circuit is connected to the input end of the Buck/Boost circuit, and the signal interlocking and driving circuit is used for achieving strong current isolation of the Buck/Boost circuit and control over a first main power tube and a second main power tube of the Buck/Boost circuit, and improving driving capability and logic interlocking functions of PWM wave signals of the PWM logic control circuit.
Furthermore, the Buck/Boost circuit further comprises a first inductor, a first capacitor, a second capacitor and a first resistor;
the source electrode of the first main power tube is connected to the drain electrode of the second main power tube and one end of the first inductor; the other end of the first inductor is connected with one end of the second capacitor; the drain electrode of the first main power tube is connected to one end of the first capacitor; the source electrode of the second main power tube is connected with the other end of the first capacitor and one end of the first resistor; the other end of the first resistor is connected with the other end of the second capacitor; and a freewheeling diode is connected between the source electrode and the drain electrode of each of the first main power tube and the second main power tube, the cathode of each freewheeling diode is connected with the drain electrode of the corresponding main power tube, and the anode of each freewheeling diode is connected with the source electrode of the corresponding main power tube.
Further, the signal interlocking and driving circuit comprises an optical coupling isolation driver 1 and an optical coupling isolation driver 2, and a grid electrode and a source electrode of the first main power tube are respectively connected with an output side of the optical coupling isolation driver 1; and the grid electrode and the source electrode of the second main power tube are respectively connected with the output side of the optical coupling isolation driver 2.
Further, the PWM logic control circuit comprises a PWMA signal terminal, a PWMB signal terminal, a DICHARGE signal terminal and a CHARGE signal terminal which are connected with the signal interlocking and driving circuit.
Furthermore, the signal interlocking and driving circuit further comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor;
one end of the second resistor and one end of the third resistor are respectively connected with the PWMA signal end and the PWMB signal end, and the other end of the second resistor and the other end of the third resistor are both connected with the ANODE end of the optical coupling isolation driver 2; one end of the fourth resistor and one end of the fifth resistor are respectively connected with the PWMA signal end and the PWMB signal end, and the other end of the fourth resistor and the other end of the fifth resistor are both connected with the ANODE end of the optical coupling isolation driver 1; one end of the sixth resistor and one end of the seventh resistor are both connected to the DICHARGE signal terminal, the other ends of the sixth resistor and the seventh resistor are respectively connected to the base of the third transistor and the base of the fourth transistor, the emitters of the third transistor and the fourth transistor are grounded, and the collectors of the third transistor and the fourth transistor are respectively connected to the CATHODE terminal of the optical coupling isolation driver 2 and the ANODE terminal of the optical coupling isolation driver 1; one end of the eighth resistor and one end of the ninth resistor are both connected with the CHARGE signal end, the other end of the eighth resistor and the other end of the ninth resistor are respectively connected to the base electrode of the fifth transistor and the base electrode of the sixth transistor, the emitter electrodes of the fifth transistor and the sixth transistor are grounded, and the collector electrodes are respectively connected to the ANODE end of the optical coupling isolation driver 2 and the CATHODE end of the optical coupling isolation driver 1.
On the other hand, the invention also provides a control method of the DC/DC bidirectional inverter circuit, which comprises the steps of adjusting the CHARGE signal to be at a high level and the DISCHARGE signal to be at a low level, so that the Buck/Boost circuit works in a voltage reduction mode, adjusting the CHARGE signal to be at a low level and the DISCHARGE signal to be at a high level, and enabling the Buck/Boost circuit to work in a voltage boosting mode.
Further, when the Buck/Boost circuit works in the Boost mode, the PWMA signal and the PWMB signal are signals with a phase difference of 180 degrees and a duty ratio of less than fifty percent, and the PWMA signal and the PWMB signal are restored to large duty ratio driving signals through the signal interlocking and driving circuit and are provided for the first main power tube and the second main power tube.
Further, the CHARGE signal and the DISCHARGE signal are two control signals that are not each other.
Compared with the prior art, the invention has the following beneficial effects:
the DC/DC bidirectional inverter circuit and the control method thereof provided by the invention can realize the conversion of high-power high-voltage energy and low-voltage energy, use the least power devices, give full play to the advantages of simple structure and simple control circuit of the Buck/Boost circuit, the Buck/Boost circuit can realize the mutual conversion of input and output of energy, the signal interlocking and driving circuit in the circuit can improve the anti-interference capability of a main power tube so as to stably and reliably switch on or off, and because the single-stage conversion power devices are the least, the switching loss is greatly reduced, the cost is low, the efficiency of the whole machine is also improved, and the DC/DC bidirectional inverter circuit is particularly suitable for energy feedback devices in frequency converters and servo driving devices.
Drawings
Fig. 1 is a schematic diagram of a DC/DC bidirectional inverter circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a DC/DC bidirectional inverter circuit according to an embodiment of the present invention;
fig. 3 is a waveform diagram of a logic control circuit of a DC/DC bidirectional inverter circuit according to an embodiment of the present invention; wherein: (a) is a PWMA waveform; (b) is a PWMB waveform; (c) controlling the on and off waveforms of the grid electrode of the second main power tube; (d) controlling the on and off waveforms of the grid electrode of the first main power tube; (e) a signal loaded on the first main power tube in a boosting mode; (f) the PWM wave signal is loaded on the second main power tube in the boosting mode.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a DC/DC bidirectional inverter circuit for high-power high-low voltage energy conversion, which includes a Buck/Boost circuit 11 (Buck or Boost chopper), an input/output voltage and current isolation sampling circuit 12, a PWM logic control circuit 13, and a signal interlock and drive circuit 14.
The Buck/Boost circuit 11 comprises a first main power tube Q1 and a second main power tube Q2, one side of the Buck/Boost circuit 11 is used for being connected with external P and N bus terminals, direct current voltages in the external P and N bus terminals are connected into the circuit, the other side of the Buck/Boost circuit is used for being connected with an energy storage module, the energy storage module can be a super capacitor or an energy storage unit with high-current charging and discharging, the first main power tube Q1 and the second main power tube Q2 are conducted in turn under the control of the PWM logic control circuit 13, so that the direct current voltages at the P and N terminals and the energy in the energy storage module are mutually converted, and the function of high-low voltage conversion is achieved.
The input end of the input/output voltage and current isolation sampling circuit 12 is connected to the output end of the Buck/Boost circuit 11, and the output end of the input/output voltage and current isolation sampling circuit is connected to the input end of the PWM logic control circuit 13, so as to implement isolation sampling and transmission of input and output signals of the Buck/Boost circuit 11.
The input end of the PWM logic control circuit 13 is connected to the output end of the input/output voltage and current isolation sampling circuit 12, and the output end of the PWM logic control circuit is connected to the input end of the signal interlock and drive circuit 14, so that the signal interlock and drive circuit 14 controls the first main power transistor Q1 and the second main power transistor Q2 to be turned on in turn, thereby completing the closed-loop control of the Buck/Boost circuit 11, and achieving the purpose of energy interconversion in the circuit.
The input end of the signal interlock and drive circuit 14 is connected to the output end of the PWM logic control circuit 13, and the output end is connected to the input end of the Buck/Boost circuit 11, so as to implement strong current isolation of the Buck/Boost circuit 11, control the first main power tube Q1 and the second main power tube Q2 according to the signal provided by the PWM logic control circuit 13, and improve the drive energy and logic interlock function of the PWM wave signal of the PWM logic control circuit 13.
The DC/DC bidirectional inverter circuit provided by the embodiment of the invention can realize the conversion of high-power high-voltage energy and low-voltage energy, uses the least power devices, and fully exerts the advantages of simple structure and simple control circuit of the Buck/Boost circuit, the Buck/Boost circuit can realize the mutual conversion of input and output of energy, the signal interlocking and driving circuit in the circuit can improve the anti-interference capability of a main power tube so as to stably and reliably switch on or off, and because the single-stage conversion power devices are the least, the switching loss is greatly reduced, the cost is low, the efficiency of the whole machine is also improved, and the DC/DC bidirectional inverter circuit is particularly suitable for energy feedback devices in frequency converters and servo driving devices.
As shown in fig. 2, a specific circuit of the DC/DC bidirectional inverter circuit according to the embodiment of the present invention is described in detail with reference to fig. 2 as follows:
the Buck/Boost circuit 11 further includes a first inductor L1, a first capacitor C1, a second capacitor C2, and a first resistor R1; the source of the first main power tube Q1 is connected to the drain of the second main power tube Q2 and one end of the first inductor L1; the other end of the first inductor L1 is connected with one end of the second capacitor C2; the drain of the first main power tube Q1 is connected to one end of the first capacitor C1; the source of the second main power tube Q2 is connected with the other end of the first capacitor C1 and one end of the first resistor R1; the other end of the first resistor R1 is connected with the other end of the second capacitor C2; and a freewheeling diode is connected between the source and the drain of each of the first main power tube Q1 and the second main power tube Q2, the cathode of each freewheeling diode is connected with the drain of the corresponding main power tube, and the anode of each freewheeling diode is connected with the source of the corresponding main power tube.
The signal interlocking and driving circuit 14 comprises an optical coupling isolation driver 1 and an optical coupling isolation driver 2, and a grid electrode and a source electrode of the first main power tube Q1 are respectively connected with an output side of the optical coupling isolation driver 1; and the grid and the source of the second main power tube Q2 are respectively connected with the output side of the optical coupling isolation driver 2. The grid of the first main power tube Q1 receives a signal output by the optical coupling isolation driver 1 to control the first main power tube Q1 to be switched on and off, and the grid of the second main power tube Q2 receives a signal output by the optical coupling isolation driver 2 to control the second main power tube Q2 to be switched on and off.
The PWM logic control circuit 13 includes a PWMA signal terminal, a PWMB signal terminal, a DICHARGE signal terminal and a CHARGE signal terminal connected to the signal interlock and drive circuit 14; the signal interlock and driving circuit 14 further includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a third transistor Q3, a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6; one end of the second resistor R2 and one end of the third resistor R3 are respectively connected to the PWMA signal terminal and the PWMB signal terminal, and the other end of the second resistor R2 and the other end of the third resistor R3 are both connected to the ANODE terminal of the opto-isolated driver 2; one end of the fourth resistor R4 and one end of the fifth resistor R5 are respectively connected to the PWMA signal terminal and the PWMB signal terminal, and the other end of the fourth resistor R4 and the other end of the fifth resistor R5 are both connected to the ANODE terminal of the opto-isolated driver 1; one end of the sixth resistor R6 and one end of the seventh resistor R7 are both connected to the DICHARGE signal terminal, the other end of the sixth resistor R6 and the other end of the seventh resistor R7 are respectively connected to the base of the third transistor Q3 and the base of the fourth transistor Q4, the emitters of the third transistor Q3 and the fourth transistor Q4 are grounded, and the collectors are respectively connected to the catode terminal of the opto-isolation driver 2 and the ANODE terminal of the opto-isolation driver 1; one end of the eighth resistor R8 and one end of the ninth resistor R9 are both connected to the CHARGE signal terminal, the other end of the eighth resistor R8 and the other end of the ninth resistor R9 are respectively connected to the base of the fifth transistor Q5 and the base of the sixth transistor Q6, the emitters of the fifth transistor Q5 and the sixth transistor Q6 are grounded, and the collectors are respectively connected to the ANODE terminal of the opto-isolation driver 2 and the CATHODE terminal of the opto-isolation driver 1. The signal interlocking and driving circuit 14 receives signals of the PWM logic control circuit 13 and transmits the signals to a first main power tube Q1 and a second main power tube Q2 in the Buck/Boost circuit 11 through the side of the optical coupling isolation driver 2 and the side of the optical coupling isolation driver 1, the side of the optical coupling isolation driver 2 and the side of the optical coupling isolation driver 1 are connected to the first main power tube Q1 and the grid electrode of the second main power tube Q2, and the interlocking of driving signals of the first main power tube Q1 and the second main power tube Q2 can ensure that the first main power tube Q1 and the second main power tube Q2 are stably and reliably switched in a voltage boosting mode and a voltage reducing mode.
By adopting the DC/DC bidirectional inverter circuit, the voltage reduction and voltage boosting closed-loop control is realized by adjusting the two paths of PWMA and PWMB wave duty ratio, the CHARGE signal and the DISCHARGE signal which are 180 degrees from each other and output by the PWM logic control circuit 13, and the bidirectional transmission of energy is completed. The circuit is simple in structure, the signal interlocking and driving circuit can improve the signal interference resistance in the DC/DC circuit to enable the DC/DC circuit to work stably and reliably, PWMA and PWMB signals can output large duty ratio signals through the signal interlocking and driving circuit and the optocoupler isolation driver in the boosting and reducing processes, particularly, the boosting ratio can be greatly improved in the boosting process, and the output process of converting low voltage into high voltage in boosting control is completed. The whole circuit architecture can realize high-power conversion and output with minimum power devices.
The embodiment of the invention also provides a control method of the DC/DC bidirectional inverter circuit, which is characterized in that the Buck/Boost circuit 11 works in a step-down mode by adjusting the CHARGE signal to be high level and the DISCHARGE signal to be low level, so as to complete the conversion from high voltage to low voltage, and the PWM signal is loaded to the grid of the first main power tube Q1 when the high voltage is converted into low voltage, so as to make the circuit work in the step-down mode; the CHARGE signal is adjusted to be low level, and the DISCHARGE signal is adjusted to be high level, so that the Buck/Boost circuit 11 works in a Boost mode. Further, when the Buck/Boost circuit 11 operates in the Boost mode, the PWMA signal and the PWMB signal have a phase difference of 180 degrees with each other, an operating frequency of greater than 20KC, a dead time left, and a duty ratio of less than fifty percent, and are restored to large duty ratio driving signals by the signal interlock and driving circuit 14 and are provided to the first main power transistor Q1 and the second main power transistor Q2, and the PWMA signal and the PWMB signal pass through the optical coupling isolation driver 2 and are loaded to the gate of the second main power transistor Q2, so that the Boost ratio is improved, and the transmission voltage is greatly improved.
Preferably, the CHARGE signal and the DISCHARGE signal are two control signals which are not mutually, so that the signal interlocking effect of the PWM waves of the first main power tube and the second main power tube is also ensured except for controlling the mode interchange of the voltage boosting and the voltage reducing, and the reliability of the circuit is greatly improved.
Specifically, as shown in fig. 3 (d), in the boost mode, the DISCHARGE signal is high, the CHARGE signal is low, when acting on the third transistor Q3 and the fourth transistor Q4, the third transistor Q3 and the fourth transistor Q4 are turned on, the collector of the fourth transistor Q4 is connected to the ANODE terminal of the opto-isolator driver 1, the PWMA signal transmitted to the opto-isolator driver 2 is bypassed to the ground due to the turn-on of the fourth transistor Q4, the collector of the third transistor Q3 is connected to the CATHODE terminal of the opto-isolator driver 2, at this time, the third transistor Q3 is turned on, the PWMA signal and the PWMB signal of fig. 3 (b) of fig. 3 (a) flow into the ANODE terminal of the opto-isolator driver 2 through the second resistor R2 and the third resistor R3, and form a loop through the third transistor Q3, the opto-isolator driver 2 side drives the second main power transistor Q2 with the PWMA, PWMB signal or a larger duty ratio wave, referring to fig. 3 (f), a PWM signal with a duty cycle greater than ninety percent is generated on the second main power transistor Q2, and the boost ratio can be greatly improved by this PWM signal, so as to improve the output voltage. The CHARGE signal is at low level in the boost mode, which effectively ensures the turn-off of the fifth transistor Q5 and the sixth transistor Q6, and the DISCHARGE signal is at low level and the CHARGE signal is at high level in the buck mode. Compared with an interleaved mode circuit, the whole circuit has two power devices (also can be an IGBT with two units) and an inductor, and the control circuit is simple and small in size.
In the embodiment of the invention, the main power tube and the transistor can be switching devices such as an IGBT tube or an MOS tube. The input/output and current isolation sampling circuit 12 in the DC/DC bidirectional inverter circuit and the isolation devices in the optical coupling isolation driver 1 and the optical coupling isolation driver 2 in the signal interlocking and driving circuit 14 may adopt magnetic isolation or optical isolation devices, and the working principle thereof is not described again. The PWM Logic control circuit 13 is preferably a DSP (Digital Signal Processor), and other types of Programmable Logic devices such as a single chip microcomputer (mcu) and a Programmable Logic Controller (PLC) may be used without limitation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A DC/DC bidirectional inverter circuit is characterized in that: the device comprises a Buck/Boost circuit, an input/output voltage and current isolation sampling circuit, a PWM logic control circuit and a signal interlocking and driving circuit;
the Buck/Boost circuit comprises a first main power tube and a second main power tube, wherein one side of the Buck/Boost circuit is used for being connected with external P and N bus ends, the other side of the Buck/Boost circuit is used for being connected with an energy storage module, and the first main power tube and the second main power tube are conducted in turn under the control of the PWM logic control circuit, so that direct-current voltages of the P and N ends and energy in the energy storage module are converted with each other;
the input end of the input/output voltage and current isolation sampling circuit is connected to the output end of the Buck/Boost circuit, and the output end of the input/output voltage and current isolation sampling circuit is connected to the input end of the PWM logic control circuit and is used for realizing isolation sampling and transmission of input and output signals of the Buck/Boost circuit;
the output end of the PWM logic control circuit is connected to the input end of the signal interlocking and driving circuit and is used for controlling the first main power tube and the second main power tube to be conducted in turn so as to complete closed-loop control of the Buck/Boost circuit;
the input end of the signal interlocking and driving circuit is connected to the output end of the PWM logic control circuit, the output end of the signal interlocking and driving circuit is connected to the input end of the Buck/Boost circuit, and the signal interlocking and driving circuit is used for realizing strong current isolation of the Buck/Boost circuit and control of a first main power tube and a second main power tube of the Buck/Boost circuit, and improving the driving capability and the logic interlocking function of a PWM wave signal of the PWM logic control circuit;
the Buck/Boost circuit further comprises a first inductor, a first capacitor, a second capacitor and a first resistor; the source electrode of the first main power tube is connected to the drain electrode of the second main power tube and one end of the first inductor; the other end of the first inductor is connected with one end of the second capacitor; the drain electrode of the first main power tube is connected to one end of the first capacitor; the source electrode of the second main power tube is connected with the other end of the first capacitor and one end of the first resistor; the other end of the first resistor is connected with the other end of the second capacitor; a freewheeling diode is connected between the source electrode and the drain electrode of each of the first main power tube and the second main power tube, the cathode of each freewheeling diode is connected with the drain electrode of the corresponding main power tube, and the anode of each freewheeling diode is connected with the source electrode of the corresponding main power tube;
the signal interlocking and driving circuit comprises an optical coupling isolation driver 1 and an optical coupling isolation driver 2, and a grid electrode and a source electrode of the first main power tube are respectively connected with the output side of the optical coupling isolation driver 1; the grid electrode and the source electrode of the second main power tube are respectively connected with the output side of the optical coupling isolation driver 2;
the PWM logic control circuit comprises a PWMA signal end, a PWMB signal end, a DICHARGE signal end and a CHARGE signal end which are connected with the signal interlocking and driving circuit;
the signal interlocking and driving circuit further comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third transistor, a fourth transistor, a fifth transistor and a sixth transistor; one end of the second resistor and one end of the third resistor are respectively connected with the PWMA signal end and the PWMB signal end, and the other end of the second resistor and the other end of the third resistor are both connected with the ANODE end of the optical coupling isolation driver 2; one end of the fourth resistor and one end of the fifth resistor are respectively connected with the PWMA signal end and the PWMB signal end, and the other end of the fourth resistor and the other end of the fifth resistor are both connected with the ANODE end of the optical coupling isolation driver 1; one end of the sixth resistor and one end of the seventh resistor are both connected to the DICHARGE signal terminal, the other ends of the sixth resistor and the seventh resistor are respectively connected to the base of the third transistor and the base of the fourth transistor, the emitters of the third transistor and the fourth transistor are grounded, and the collectors of the third transistor and the fourth transistor are respectively connected to the CATHODE terminal of the optical coupling isolation driver 2 and the ANODE terminal of the optical coupling isolation driver 1; one end of the eighth resistor and one end of the ninth resistor are both connected with the CHARGE signal end, the other end of the eighth resistor and the other end of the ninth resistor are respectively connected to the base electrode of the fifth transistor and the base electrode of the sixth transistor, the emitter electrodes of the fifth transistor and the sixth transistor are grounded, and the collector electrodes are respectively connected to the ANODE end of the optical coupling isolation driver 2 and the CATHODE end of the optical coupling isolation driver 1.
2. A control method of the DC/DC bidirectional inverter circuit according to claim 1, characterized in that: the Buck/Boost circuit works in a Buck mode by adjusting the CHARGE signal to be high level and the DISCHARGE signal to be low level, and the Buck/Boost circuit works in a Boost mode by adjusting the CHARGE signal to be low level and the DISCHARGE signal to be high level.
3. The control method of the DC/DC bidirectional inverter circuit according to claim 2, wherein: when the Buck/Boost circuit works in a Boost mode, the PWMA signal and the PWMB signal are signals with a phase difference of 180 degrees and a duty ratio of less than fifty percent, and the PWMA signal and the PWMB signal are restored into large duty ratio driving signals through the signal interlocking and driving circuit and are provided for the first main power tube and the second main power tube.
4. The control method of the DC/DC bidirectional inverter circuit according to claim 2, wherein: the CHARGE signal and the DISCHARGE signal are two control signals that are not each other.
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| CN201811293078.1A CN109462334B (en) | 2018-11-01 | 2018-11-01 | DC/DC bidirectional inverter circuit and control method thereof |
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| CN201811293078.1A CN109462334B (en) | 2018-11-01 | 2018-11-01 | DC/DC bidirectional inverter circuit and control method thereof |
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| CN109462334B true CN109462334B (en) | 2020-08-28 |
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| CN116054688A (en) * | 2023-02-21 | 2023-05-02 | 惠州华智新能源科技有限公司 | Photovoltaic power generation energy storage system of two-way DC-DC |
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| CN202282730U (en) * | 2011-11-11 | 2012-06-20 | 山东新风光电子科技发展有限公司 | Upper and lower bridge interlocking circuit in two-level inverter |
| CN103441667B (en) * | 2013-09-18 | 2016-08-17 | 湘潭大学 | A kind of direct-flow controlling device being applied to multistage energy-storage system |
| CN105620706B (en) * | 2016-02-19 | 2018-10-23 | 武汉理工大学 | Watercraft electric propulsion system with harmonics restraint and regenerative braking function and control method |
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