Transistor switch control circuit
AssigneeGreen Solution Technology Co., Ltd.
InventorsLi-Min Lee, Chung-Che Yu, Shian-Sung Shiu, Si-Min Wu
Life of this patent
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Abstract
A synchronous driving circuit in the arts may cause a short through pheromone when a duty cycle of a duty cycle control signal is too short. The present invention sets a delay time with a suitable period when the duty cycle of the duty cycle control signal is too short to avoid the short through phenomenon.
Claims12
A transistor switch control circuit, for controlling a high-side transistor and a low-side transistor connected in series, and the transistor switch control circuit comprising:
- a high-side driving circuit, generating a high-side control signal according to a duty cycle control signal to turn on the high-side transistor and generate a high-side conducting signal;
- and
- a low-side driving circuit, generating a low-side control signal according to the duty cycle control signal and the high-side conducting signal to turn on the low-side transistor, and the low-side driving circuit comprising:
- a delay circuit, generating a delay signal according to the duty cycle control signal, wherein a pulse width of the delay signal is greater than a pulse width of the duty cycle control signal for more than a predetermined time period;
- and
- a short through preventing circuit, generating the low-side control signal according to the delay signal and the high-side conducting signal, so that the low-side transistor is turned on after the high-side transistor is turned off, and is turned off before the high-side transistor is turned on.
A transistor switch control circuit, for controlling a high-side transistor and a low-side transistor connected in series, and the transistor switch control circuit comprising:
- a high-side driving circuit, generating a high-side control signal according to a duty cycle control signal to turn on the high-side transistor and generate a high-side conducting signal;
- and
- a low-side driving circuit, generating a low-side control signal according to the duty cycle control signal and the high-side conducting signal to turn on the low-side transistor, and the low-side driving circuit comprising:
- a delay circuit, generating a delay signal, wherein a start time point of the delay signal is determined according to a start time point of the duty cycle control signal, and an end time point of the delay signal is determined according to a logic level of the duty cycle control signal after receiving the high-side conducting signal;
- and
- a short through preventing circuit, generating the low-side control signal according to the delay signal and the high-side conducting signal, so that the low-side transistor is turned on after the high-side transistor is turned off, and is turned off before the high-side transistor is turned on.
Dependencies are inferred from the claim text.