A control circuit with a two-point regulator for regulating a clock-driven converter
A clock-driven, control circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, output power conversion devices, etc., can solve problems such as poor electromagnetic compatibility
Active Publication Date: 2021-11-23
OPTOTRONIC GMBH
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- Application Information
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Problems solved by technology
[0008] Thus, the known regulation modes for clock-driven converters having a very large output voltage range and at the same time a very large output current range are associated with very high losses in some operating states, especially at very small output voltage and / or extremely small output current in case
[0009] A further disadvantage of the hard-switching process is the poor electromagnetic compatibility at higher frequencies above 10 MHz and the miniaturization possible only to a limited extent due to the aforementioned disadvantages
Method used
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Embodiment Construction
[0033] image 3 A schematic circuit diagram of a known synchronous rectification buck converter is shown. with the front figure 1 The main difference of the illustrated topology is that the converter diode DF is replaced by the lower transistor SU. This results in a half-bridge configuration, in which the half-bridge is connected in parallel to the input of the converter. The positive input is at a DC potential of approximately 400V, and the negative input is at a reference potential. The converter choke L is connected to the midpoint HSS of the half-bridge, and the other terminal of the converter choke L together with the reference potential forms the output terminal LED+ / LED- of the converter. Connected in parallel to the output terminals LED+ / LED- of the converter is a filter capacitor C_filter.
[0034] The two half-bridge transistors SO and SU are now as Figure 4 Driven as shown. Figure 4 A timing diagram of a known synchronous rectification buck converter is show...
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The invention relates to a control circuit with a two-point regulator for regulating a clock-driven converter, with an upper threshold characterizing the switch-off time point of a first converter transistor of the clock-driven converter; a lower threshold value, It characterizes the turn-off time point of the second converter transistor of the clock-driven converter, the lower threshold is set according to the output voltage or output current of the clock-driven converter, so as to meet the specific operating parameters of the clock-driven converter, the upper threshold the thresholds are set such that the output current of the clocked converter corresponds to the predetermined output current of the clocked converter, these thresholds are derived from the operating parameters of the clocked converter and unavoidable delay times of real components, The lower threshold value is determined by means of the current through the converter choke of the clocked converter, and the current through the converter choke is negative at the switch-off time. The invention also relates to a method for regulating a clock-driven converter.
Description
technical field [0001] The invention relates to a control circuit for regulating a clock-synchronous rectifying converter, such as a synchronous rectifying buck converter by means of a two-point regulator and a superimposed threshold regulation system. Background technique [0002] The invention relates to a control circuit having a two-point regulator for regulating a clock-driven converter. [0003] figure 1 A known buck converter is shown with likewise known main components. The switch SO is connected in series with the freewheeling diode DF. The connection point of the cathode of the freewheeling diode DF and the connection point of the switch SO are connected to the choke coil L. The other terminal of the choke coil L is connected to the filter capacitor C_filter. The other end of the filter capacitor C_filter and the anode of the diode DF are grounded. [0004] The other terminal of the switch SO is connected to the ground of the input terminal of the buck convert...
Claims
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IPC IPC(8): H02M3/156H02M3/158H02M1/00
CPCH02M3/156H02M3/1563H02M3/1588H02M1/0003H02M1/0016H02M1/0025Y02B70/10
Inventor 托马斯·波利施安斯基菲利波·布兰凯蒂马库斯·黑克曼薛燕顺
Owner OPTOTRONIC GMBH