Grid-proof driving signal oscillation circuit
An oscillation circuit and gate drive technology, which is applied in the field of anti-gate drive signal oscillation circuit, can solve the problems that the drive circuit cannot provide negative voltage and the MOSFET turn-on speed is reduced, so as to reduce distributed inductance, realize simple implementation, and reduce oscillation amplitude Effect
Inactive Publication Date: 2012-01-04
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
Its disadvantages are: (a) MOSFET turn-on speed is reduced
(b) The drive circuit cannot provide a certain negative voltage during shutdown
Method used
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[0008] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings: this embodiment is implemented under the premise of the technical solution of the present invention, and detailed implementation methods and specific descriptions have been provided, but the protection scope of the present invention is not limited to the following the embodiment.
[0009] refer to figure 1 , an anti-gate drive signal oscillation circuit involved in this embodiment includes: a drive chip IC, a small resistor R1 in series with the gate, a high-end switch T1, a low-side switch T2, a gate-source parallel resistor R2, a bidirectional Zener diode D1, current limiting resistor R3, fast recovery diode D2, diode D3, diode D4, diode D5, diode D6, capacitor C. The output signal of the drive chip IC reaches the gate of the high-end switching tube T1 through the gate series resistor R1, the low-side switch tube T2, the gate-source parallel resis...
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The invention relates to an anti-grid driving signal oscillation circuit, which pertains to the electric power technology field and includes a driving chip, a small grid serial resistor, a high-end switching tube, a low-end switching tube, a grid source parallel resistor, a two-way voltage regulator diode, a fast recovery diode, a current-limiting resistor, a diode and a capacitor. The driving chip outputs signals which reach the grids of the high-end switching tube through the small grid serial resistor; the low-end switching tube and the grid source parallel resistor are connected in parallel with the two-way voltage regulator diode; the two ends of the grid source parallel resistor is connected in parallel with a serial branch which is formed by the fast recovery diode and the current-limiting resistor; the positive pole of the fast recovery diode is connected with the current-limiting resistor; a serial branch which is formed by a plurality of diodes and the capacitor is connectedin parallel between the source electrode of the low-end switching tube and the grid source parallel resistor; and a reference ground is connected between the diode and the capacitor. The circuit can avoid the direct current of the bridge arm which is produced by the mistaking conduction of MOSFET due to the oscillation of grid driving signals and has the advantages of simple realization, low costand safety and reliability.
Description
technical field [0001] The present invention relates to an oscillating circuit in the field of power supply technology, in particular to an anti-grid driving signal oscillating circuit. Background technique [0002] The integrated switching power supply and high-frequency induction heating power supply often use a bridge topology MOSFET (metal-oxide film-semiconductor field effect transistor) circuit. In the existing bridge topology MOSFET drive circuits, most of them provide a suitable dead time to prevent the upper and lower switching devices of the same bridge arm from passing through and forming a short circuit. However, due to the Miller effect of the drive bridge circuit, the gate drive signal will oscillate during the conversion process of two power devices on the same bridge arm, and the loss of the power devices is relatively large at this time. When the amplitude of the oscillation is large, the power device will be turned on, causing the power switch tube to pass...
Claims
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IPC IPC(8): H02M1/36
Inventor 莫锦秋梁庆华王石刚范进秋张斌
Owner SHANGHAI JIAOTONG UNIV