CN210041635U

CN210041635U - Inverter driving system based on IR21844 control and applied to UPS

Info

Publication number: CN210041635U
Application number: CN201921305807.0U
Authority: CN
Inventors: 许雅玲; 陈力
Original assignee: XIAMEN EVADA ELECTRONICS CO Ltd
Current assignee: XIAMEN EVADA ELECTRONICS CO Ltd
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-02-07
Anticipated expiration: 2029-08-13

Abstract

The utility model relates to the technical field of power electronics, in particular to an inversion driving system based on IR21844 control and applied to UPS, compared with the prior art, the inversion driving system adopts an IR21844 driving chip with high integration degree, and makes partial improvement on the specific application of the inversion driving system, the chip is well applied on a driving MOS tube, the reliability of a driving circuit is greatly improved, the requirement of logic level on the control of a power device is simplified, only two chips are needed to drive the UPS inverter with four IGBTs, and the driving waveform is improved, so that the output driving of a lower tube has negative bias, the application of the inversion driving system is widely applied on the UPS, because the self bootstrap suspension power supply design brings convenience for the system design, the circuit is simplified, a passive device is added to make the circuit generate a negative bias, the structure is simple, the volume is small, the cost is reduced, and the reliability of the system is improved.

Description

Inverter driving system based on IR21844 control and applied to UPS

Technical Field

The invention relates to the technical field of power electronics, in particular to an inverter driving system based on IR21844 control and applied to a UPS.

Background

With the progress of science and technology in China, people research the power electronic industry more and more deeply, the application occasions of the power electronic industry are closer to the living fields of people, from industry to finance to traffic to daily office, bridge circuits formed by MOS devices or IGBT devices are applied to more and more occasions, the UPS industry is no exception, and the research on the drive control technology becomes a hotspot. In a switch device of a power conversion device, two driving modes of direct driving and isolated driving are adopted, isolated driving can be divided into photoelectric driving isolation and electromagnetic driving isolation, the photoelectric isolation is adopted, the size is small, the structure is simple, but the transmission speed of the device is only dozens of khz at the highest, and the common-mode rejection capability of the device is poor; the electromagnetic isolation is widely applied to a driving circuit, and generally, a transformer is used as an isolation element of the electromagnetic isolation, so that the transmission speed is high, and the insulation strength is high. But the maximum transmission width is limited by the magnetic saturation characteristic, so the top of the signal is not easy to transmit, the maximum duty ratio is limited, and compared with photoelectric isolation, the photoelectric isolation has the defects of large volume, complex process and the like. However, in the case of isolated drives, each group of drives needs to provide a floating power supply, which increases the complexity of the circuit and brings inconvenience to the system.

Disclosure of Invention

In order to solve the defects and problems of the uninterruptible power supply in the prior art, an inverter driving system based on IR21844 control applied to the UPS is provided.

The technical scheme adopted by the invention for solving the technical problem is as follows: the driving chip of the inverter driving system based on IR21844 control applied to the UPS adopts an IR21844 driving chip, and adopts a bootstrap circuit and a negative bias generating circuit, the driving waveform of the inverter driving system is improved through the bootstrap circuit, so that the output driving of a lower tube has negative bias; the circuit comprises a trigger, a voltage comparator, a driving signal Q1, a driving signal Q2, a singlechip and a low-pass filter; a single chip microcomputer inputs a driving signal Q1 and a driving signal Q2 to give an SPWM signal, the signal generates a reference sine signal through a low-pass filter, the reference sine signal generates a hysteresis signal through a conditioning circuit, two groups of trigger signals which are compared with hysteresis voltage are output through a voltage comparator, and the trigger generates an input signal for driving a control chip; the bootstrap circuit comprises a bootstrap capacitor and a bootstrap diode, and bootstrap power supply is realized in the bootstrap circuit.

The number of the IR21844 driving chips is two, and the two IR21844 driving chips drive the UPS inverter with four IGBTs.

The invention has the beneficial effects that: compared with the prior art, the inverter driving system based on IR21844 control applied to the UPS of the invention adopts a high-integration level conversion technology, in particular to the application of an IR21844 integrated chip in a bridge type driving circuit, and makes partial perfect improvement on the specific application thereof, adopts an IR21844 driving chip which is well applied on a driving MOS tube, greatly improves the reliability of the driving circuit, simplifies the requirement of logic level on the control of a power device, can drive a UPS inverter with four IGBTs only by two chips, improves the driving waveform thereof, enables the output driving of a lower tube thereof to have negative bias, and is widely applied on the UPS, because the self bootstrap suspension power supply design brings convenience to the system design, simplifies the circuit, adds a passive device to enable the circuit to generate a negative bias, the device has the advantages of simple structure, small volume, reduced cost and improved system reliability.

Drawings

The inverter driving system based on IR21844 control applied to UPS according to the present invention will be further described with reference to the accompanying drawings and the detailed description.

FIG. 1 is a schematic diagram of an IR21844 driver IC applied to an inverter driving system based on IR21844 control in a UPS according to the present invention;

FIG. 2 is a circuit diagram of an input/output timing sequence of an inverter driving system based on IR21844 control applied to a UPS according to the present invention;

FIGS. 3 and 4 are schematic diagrams of a bootstrap circuit of an IR 21844-based control inverter driving system applied to a UPS according to the present invention;

fig. 5 and 6 are schematic diagrams of a negative bias generation circuit of an inverter driving system based on IR21844 control applied to a UPS according to the present invention.

Detailed Description

As shown in fig. 1 to 6, the IR21844 driver chip is a standard monolithic structure with 14 pins, and is fabricated by using a CMOS schmitt process, which can improve the anti-interference capability of the circuit; the logic level circuit and the power circuit share one power supply, the power supply adapts to the input of CMOS and TTL logic signals, the threshold voltage is one tenth of the power supply voltage, and the functions of receiving slowly rising signals and improving the anti-interference capability of a chip are achieved; the suspended interception power supply is arranged to be capable of operating in a bootstrap mode, the highest end voltage of the suspended interception power supply can reach 600V, and the static power consumption is 1.6W; the circuit is provided with 2 independent high-end and low-end output channels, and both the two channels have a hysteresis under-voltage locking function; level shift circuits for UDD and USS allowing an offset voltage amount of + -5V between a logic reference ground Vss and a power reference ground COM; the dead time is adjustable, the pin of the chip DT is externally connected with a resistor, and the dead time can be adjusted by adjusting the resistance value of the resistor, so that two tubes are prevented from being directly connected instantly when the level is converted by an upper tube and a lower tube.

As shown in fig. 1 to 6, firstly, the input drivers Q1 and Q2 are driven by the single chip to provide an SPWM signal, the SPWM signal is passed through a low pass filter to generate a reference sinusoidal signal, the reference sinusoidal signal is passed through a conditioning circuit to generate a hysteresis signal, two sets of trigger signals of D flip-flops compared with the hysteresis voltage are output through a voltage comparator, and the flip-flops generate input signals for driving the control chip.

As shown in fig. 1 to 6, C502 and D500 are bootstrap capacitors and bootstrap diodes, when Q8 and Q7 are turned on and Q5 and Q6 are turned off, VCC charges C502 through D500, C502 and Q7 to ensure that when Q7 is turned off and Q5 is turned on, the gate of the Q5 transistor is driven by enough stored energy on C502, which is the bootstrap power supply of the high side; if the load impedance is relatively high, the C502 is charged slowly through load step-down, so that the Q7 turns off the Q5 to be turned on, the voltage on the C502 does not reach the voltage larger than 8.3V required for bootstrap, and thus the under-voltage device of the chip will be started to perform logic lockout, and the upper tube Q5 cannot work at this time.

As shown in fig. 1 to 6, in the negative bias generating circuit, negative voltage circuits composed of capacitors and 5.1V voltage regulators are added to the upper and lower tube driving circuits, during the power-on period, the power supply charges C505, the C505 maintains 5V, and when LO outputs 0V, the voltage on the gate of Q6 is-5V, so as to realize the negative voltage of turn-off.

In summary, compared with the prior art, the inverter driving system based on IR21844 control applied to UPS of the invention adopts the level conversion technology with high integration level, in particular to the application of an IR21844 integrated chip in a bridge type driving circuit, and makes partial perfect improvement on the specific application thereof, the IR21844 driving chip is adopted, the chip is well applied on a driving MOS tube, the reliability of the driving circuit is greatly improved, the requirement of logic level on the control of a power device is simplified, only two chips are needed on a UPS inverter with four IGBTs for driving, and the driving waveform is improved, so that the output driving of a lower tube has negative bias, the application of the inverter driving system is widely applied on the UPS, the design of a self bootstrap suspension power supply brings convenience to the system design, the circuit is simplified, a passive device is added to make the circuit generate a negative bias, the device has the advantages of simple structure, small volume, reduced cost and improved system reliability.

The present invention has been described in accordance with embodiments thereof with the understanding that the present invention is not limited thereto but rather it is to be understood that variations and/or modifications may be made by those skilled in the art without departing from the scope of the invention as defined by the appended claims, and any such modifications, equivalents and the like as fall within the true spirit and scope of the invention.

Claims

1. The utility model provides an it is applied to contravariant actuating system based on IR21844 control on UPS which characterized in that: the driving chip adopts an IR21844 driving chip, and adopts a bootstrap circuit and a negative bias generating circuit, and the driving waveform of the driving chip is improved by the bootstrap circuit, so that the output driving of a lower tube has negative bias; the circuit comprises a trigger, a voltage comparator, a driving signal Q1, a driving signal Q2, a singlechip and a low-pass filter; a single chip microcomputer inputs a driving signal Q1 and a driving signal Q2 to give an SPWM signal, the signal generates a reference sine signal through a low-pass filter, the reference sine signal generates a hysteresis signal through a conditioning circuit, two groups of trigger signals which are compared with hysteresis voltage are output through a voltage comparator, and the trigger generates an input signal for driving a control chip; the bootstrap circuit comprises a bootstrap capacitor and a bootstrap diode, and bootstrap power supply is realized in the bootstrap circuit.

2. The inverter driving system based on IR21844 control applied to the UPS according to claim 1, wherein: the number of the IR21844 driving chips is two, and the two IR21844 driving chips drive the UPS inverter with four IGBTs.