Power supply device and control method thereof
A technology of power supply device and controller, which is applied in the field of power supply, can solve the problem of high cost of power supply device, and achieve the effect of low cost and no disturbance
Pending Publication Date: 2021-06-18
深圳市东准电子科技有限公司
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Problems solved by technology
However, using two converters to supply power to the LED load terminal and the control terminal respectively makes the cost of the power supply device relatively high
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[0032] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following description The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0033] see Figure 1 to Figure 3 As shown, this embodiment provides a power supply device, which can output a stable voltage to the control terminal 17 while driving the load terminal 16, and only needs one converter 11, so the cost is lower.
[0034] Specifically, the power supply device includes a converter 11, a tr...
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The invention discloses a power supply device and a control method thereof. The power supply device comprises a converter, a transformer, a first rectifying device, a second rectifying device, a PWM controller, a current error amplifier, a voltage conversion circuit, a proportional sampling circuit, a voltage error amplifier and a control driver. According to the power supply device and the control method thereof provided by the invention, when the PWM controller controls a load end to be disconnected, the current error amplifier keeps the current error level output at the moment before disconnection unchanged, so that the driving voltage of the load end keeps unchanged. The driving voltage of the load end and the voltage at the two ends of a control end are from the two closely coupled secondary windings of the same transformer, so that when the driving voltage of the load end is unchanged, the voltage at the two ends of the control end also remains unchanged. According to the embodiment of the invention, the constant-current work of the load end can be ensured when the load end is switched on, and the voltage at the two ends of the control end can be ensured to be unchanged before and after the load end is switched off and is always stable without generating disturbance.
Description
technical field [0001] The invention belongs to the field of power supply technology, and in particular relates to a power supply device and a control method thereof. Background technique [0002] The LED power supply device provided in the prior art usually uses a converter to supply power to the LED load terminal and the control terminal at the same time. Since the LED is controlled by PWM technology, it is always switched back and forth between on and off states. In order to make the LED work normally and keep the real-time voltage of the control terminal stable, two converters are usually used to supply power to the LED load terminal and the control terminal respectively, that is, one converter supplies power to the LED load terminal, and the other converter supplies power to the control terminal. . However, using two converters to supply power to the LED load terminal and the control terminal respectively makes the cost of the power supply device relatively high. Co...
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IPC IPC(8): H05B45/345H02M1/08
CPCH05B45/345H02M1/08Y02B20/40
Inventor 杨东平
Owner 深圳市东准电子科技有限公司