Anti-phase boost-buck converter driving circuit and method thereof
A driving circuit and circuit technology, applied in the field of driving circuits and driving inverting buck-boost converters, can solve the problems of complex driving circuit design and large switching loss, etc.
Active Publication Date: 2016-08-24
STMICROELECTRONICS (SHENZHEN) R&D CO LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
The reason for this problem is because of the large switching losses that occur in the inverting buck-boost converter, and the inverting buck-boost converter requires a more complex drive circuit design
Method used
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[0017] now refer to figure 1 , figure 1 A circuit diagram of a synchronous inverting buck-boost converter circuit 10 is shown. The circuit includes a pulse width modulation (PWM) control circuit (control module) 12 , a driver circuit 14 , a power MOS circuit 16 and a load circuit (LC) 18 .
[0018] The control circuit 12 includes an oscillator circuit (OSC) 19 configured to generate a sawtooth oscillation signal and a pulse oscillation signal. Both signals have the same frequency. The pulse oscillating signal is applied to the control logic circuit 23 and is used as, for example, a timing (clock) reference signal. A current-to-voltage conversion circuit (I to V) 21 converts the sensed current signal 20 into a voltage signal 22 . The voltage signal 22 is then added (via a summing circuit 24 ) to the sawtooth oscillating signal to generate a ramp signal 26 . The ramp signal 26 is applied to a first input of a comparator (Comp) 33 . Voltage divider circuit 28 receives refer...
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The invention relates to an anti-phase boost-buck converter driving circuit and a method thereof. The driving circuit comprises a high side power transistor and a low side power transistor, wherein the high side power transistor possesses a source electrode-drain electrode path coupled between a first node and a second node; and the low side power transistor possesses a source electrode-drain electrode path coupled between the second node and a third node. A high side driving circuit possesses input configured to receive a driving signal and output configured to drive a control terminal of the high side power transistor. The high side driving circuit is configured and served as a capacitive driver to operate. A low side driving circuit possesses input configured to receive a complementary driving signal and output configured to drive a control terminal of the low side power transistor. The low side driving circuit is configured and served as a level displacement driver to operate.
Description
technical field [0001] The present disclosure relates generally to buck-boost converter circuits, and more particularly to driver circuits and methods for driving inverting buck-boost converters. Background technique [0002] DC / DC converter circuits are widely used in battery-operated portable devices. Examples of such devices include: smart phones, smart watches, cameras, media players, and many other portable digital devices. To extend battery life, those skilled in the art recognize the need for efficient operation over a wide load range. In many instances, the overall efficiency of the device is limited by the efficiency of the included inverting buck-boost converter. The reason for this problem is because larger switching losses occur in the inverting buck-boost converter, and the inverting buck-boost converter requires a more complex drive circuit design. Accordingly, there is a need in the art to maximize battery life by improving the efficiency of the inverting b...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02M1/088
CPCH02M1/08H03K2217/0063H03K2217/0072H03K2217/0081H02M3/158Y02B70/10H02M1/0032H02M3/156H02M1/0009H02M3/1582
Inventor 张海波黄令华
Owner STMICROELECTRONICS (SHENZHEN) R&D CO LTD