Full-bridge type inverter driving circuit
A drive circuit and inverter technology, which is applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problem of low reliability and safety, susceptibility to interference, and damage to field effect transistors. and other issues to achieve the effect of improving reliability and security, saving DSP resources, and improving security
Active Publication Date: 2015-06-03
江苏节高电子有限公司
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a full-bridge inverter drive circuit, which can solve the problem that the existing full-bridge inverter controls the action of the field effect tube through the controller in a programmed manner, which is easily disturbed and causes up and down. Tube common and then damage the field effect tube, the problem of low reliability and safety
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[0012] Such as figure 1 The shown full-bridge inverter drive circuit includes a full-bridge inverter composed of field effect transistor Q1, field effect transistor Q2, field effect transistor Q3, and field effect transistor Q4. The field effect transistor Q1 The source of the field effect transistor Q2 is connected to form the first bridge arm, and the source of the field effect transistor Q3 is connected to the drain of the field effect transistor Q4 to form the second bridge arm; the field effect transistor Q1, field effect transistor The gates of the effect transistor Q2, the field effect transistor Q3, and the field effect transistor Q4 are respectively connected to the optocoupler U7, the optocoupler U10, the optocoupler U8, and the optocoupler U9; the optocoupler U7, the optocoupler U10 , optocoupler U8 and optocoupler U9 are respectively connected to the signal input ports through logic circuits.
[0013] Such as figure 1 As shown, the signal input port includes a PW...
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The invention discloses a full-bridge type inverter driving circuit which comprises a full-bridge inverter formed by field-effect tubes (Q1, Q2, Q3 and Q4). A source of the field-effect tube Q1 and a drain of the field-effect tube Q2 are connected to form a first bridge arm. A source of the field-effect tube Q3 and a drain of the field-effect tube Q4 are connected to form a second bridge arm. Grids of the field-effect tubes (Q1, Q2, Q3 and Q4) are connected with optical couplers (U7, U10, U8 and U9). The optical couplers (U7, U10, U8 and U9) are connected with a signal input port through logic circuits. Dead zones are formed between an upper tube and a lower tube of the same bridge arm and the upper tubes of two bridge arms through hardware, damage to the field-effect tubes caused by the fact that a full-bridge type inverter is in short circuit is completely avoided, reliability and safety of the full-bridge type inverter are effectively improved, half-period alternative connection of the two lower tubes is achieved through the hardware, and digital signal processor (DSP) resources are saved.
Description
technical field [0001] The invention relates to the field of bridge inverters, in particular to a driving circuit of the bridge inverter. Background technique [0002] Using a full-bridge inverter to control grid connection is a relatively mature grid-connected inverter scheme, which includes FET Q1, FET Q2, FET Q3, and FET Q4, of which FET Q1 And FET Q3 is the upper tube, FET Q2 and FET Q4 are the lower tubes; the upper tube FET Q1 and FET Q3 work at a frequency of 50 Hz, and they work complementary, that is, 10 milliseconds after the FET Q1 is turned on Turn off, then turn on the FET Q3, turn on the FET Q3 for 10 milliseconds and then turn it off, then turn on the FET Q1, and so on. The operating frequency of the lower tube FET Q2 and FET Q4 is 20KHz. In the positive half cycle of the power grid, the FET Q1 and the FET Q4 are turned off, the FET Q3 is turned on, and the FET Q2 works at high frequency according to the SPWM modulation mode; in the negative half cycle of the...
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IPC IPC(8): H02M7/5387
Inventor 谢卫国李青云段金成
Owner 江苏节高电子有限公司