Back to results
US 8,014,118 B2Granted
Load driving circuit, driver IC having a load driving circuit, and plasma display panel having a driver IC
AssigneeFuji Electric Systems Co., Ltd.
InventorsKoji Ikegami, Hideto Kobayashi, Hitoshi Sumida, Hiroshi Shimabukuro
Life of this patent
Estimating the term…
Abstract
A load driving circuit in which a load is connected to the connecting point of transistors as low-side and high-side main switch elements that have a totem pole structure and are connected between a pair of drive voltage supply lines. A protection circuit section is provided for the high-side transistor. In the protection circuit section, a resistor as a voltage control element is provided for a MOSFET as an overvoltage prevention switch and a capacitor is connected between the gate and the drain of the MOSFET.
Claims36
A load driving circuit comprising
- an output terminal for connection to a load;
- two main switch elements, including a low-side main switch element and a high-side main switch element having a totem pole structure and connected between a pair of drive voltage supply lines, at least one of the two main switch elements being connected to the output terminal;
- an overvoltage prevention switch configured to connect a control electrode and a low-potential-side control subject electrode of one of the two main switch elements;
- and
- a voltage control circuit including voltage-dividing components connected in series, each voltage-dividing component being one of a resistor and a capacitor, the voltage control circuit being configured to turn on the overvoltage prevention switch during a prescribed period at the time of potential variation at the output terminal, a first one of the voltage-dividing components being connected between a control terminal of the overvoltage prevention switch and the low-potential-side control subject electrode of the one main switch element and a second one of the voltage-dividing components being connected between the control terminal of the overvoltage prevention switch and the control electrode of the one main switch element, so that a potential at one end of the first one of the voltage-dividing components is applied at the control terminal of the overvoltage prevention switch and a potential at the other end of the first one of the voltage-dividing components is applied at the low-potential-side control subject electrode of the one main switch element.
2 more elements
A load driving circuit, comprising
- an output terminal for connection to a load;
- two main switch elements, including a low-side main switch element and a high-side main switch element having a push-pull structure and connected between a pair of drive voltage supply lines, at least one of the two main switch elements being connected to the output terminal;
- a high-side overvoltage prevention switch configured to connect a control electrode and a low-potential-side control subject electrode of the high-side main switch element;
- a high-side voltage control circuit including high-side voltage-dividing components connected in series, each high-side voltage-dividing component being one of a resistor and a capacitor, the high-side voltage control circuit being configured to turn on the high-side overvoltage prevention switch during a prescribed period at the time of potential variation at the output terminal, a first one of the high-side voltage-dividing components being connected between a control terminal of the high-side overvoltage prevention switch and the low-potential-side control subject electrode of the high-side main switch element and a second one of the high-side voltage-dividing components being connected between the control terminal of the high-side overvoltage prevention switch and the control electrode of the high-side main switch element, so that a potential at one end of the first one of the high-side voltage-dividing components is applied at the control terminal of the high-side overvoltage prevention switch and a potential at the other end of the first one of the high-side voltage-dividing components is applied at the low-potential-side control subject electrode of the high-side main switch element;
- a low-side overvoltage prevention switch configured to connect a control electrode and a low-potential-side control subject electrode of the low-side main switch element;
- and
- a low-side voltage control circuit including low-side voltage-dividing components connected in series, each low-side voltage-dividing component being one of a resistor and a capacitor, the low-side voltage control circuit being configured to turn on the low-side overvoltage prevention switch during a prescribed period at the time of potential variation at the output terminal, a first one of the low-side voltage-dividing components being connected between a control terminal of the low-side overvoltage prevention switch and the low-potential-side control subject electrode of the low-side main switch element and a second one of the low-side voltage-dividing components being connected between the control terminal of the low-side overvoltage prevention switch and the control electrode of the low-side main switch element, so that a potential at one end of the first one of the low-side voltage-dividing components is applied at the control terminal of the low-side overvoltage prevention switch and a potential at the other end of the first one of the low-side voltage-dividing components is applied at the low-potential-side control subject electrode of the low-side main switch element.
4 more elements
A load driving circuit, comprising
- an output terminal for connection to a load;
- a high-side main switch element connected to the output terminal;
- an overvoltage prevention switch configured to connect a control electrode and a low-potential-side control subject electrode of the high-side main switch element;
- and
- a voltage control circuit including voltage-dividing components connected in series, each voltage-dividing component being one of a resistor and a capacitor, the voltage control circuit being configured to turn on the overvoltage prevention switch during a prescribed period at the time of potential variation at the output terminal, a first one of the voltage-dividing components being connected between a control terminal of the overvoltage prevention switch and the low-potential-side control subject electrode of the high-side main switch element and a second one of the voltage-dividing components being connected between the control terminal of the overvoltage prevention switch and the control electrode of the high-side main switch element, so that a potential at one end of the first one of the voltage-dividing components is applied at the control terminal of the overvoltage prevention switch and a potential at the other end of the first one of the voltage-dividing components is applied at the low-potential-side control subject electrode of the high-side main switch element.
2 more elements
A load driving circuit, comprising
- an output terminal for connection to a load;
- a low-side main switch element having a high-potential-side control subject electrode connected to the output terminal;
- an overvoltage prevention switch configured to connect a control electrode and the low-potential-side control subject electrode of the low-side main switch element;
- and
- a voltage control circuit including voltage-dividing components connected in series, each voltage-dividing component being one of a resistor and a capacitor, the voltage control circuit being configured to turn on the overvoltage prevention switch during a prescribed period at the time of potential variation at the output terminal, a first one of the voltage-dividing components being connected between a control terminal of the overvoltage prevention switch and the low-potential-side control subject electrode of the low-side main switch element and a second one of the voltage-dividing components being connected between the control terminal of the overvoltage prevention switch and the control electrode of the low-side main switch element, so that a potential at one end of the first one of the voltage-dividing components is applied at the control terminal of the overvoltage prevention switch and a potential at the other end of the first one of the voltage-dividing components is applied at the low-potential-side control subject electrode of the low-side main switch element.
2 more elements
Dependencies are inferred from the claim text.