Current detecting circuit and supplying converter having same circit
A technology of current detection circuit and power converter, which is applied in the direction of output power conversion device, conversion equipment with intermediate conversion to AC, conversion of DC power input to DC power output, etc., which can solve the problem of high price of current detection transformer, resistance Loss and other issues
Inactive Publication Date: 2007-08-29
DELTA ELECTRONICS INC
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[0011] The main purpose of the present invention is to provide a current detection circuit, which solves the shortcomings of the current detection transformer used in the traditional current detection circuit, which is expensive and the resistance will cause a lot of loss.
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[0040] The present invention is a current detection circuit, which is suitable for a power converter, such as a DC / DC converter, to obtain the current change value of an energy storage device by detecting the voltage change value on the energy storage device.
[0041] Please refer to FIG. 2( a ), which is a schematic circuit block diagram of a power converter according to a preferred embodiment of the present invention. The power converter of the present invention is a DC / DC converter, preferably a half bridge converter, for converting a high voltage DC voltage Vin into a low voltage DC output voltage Vout. As shown in the figure, the DC / DC converter includes a control circuit 21 , a switch circuit 22 , a current detection circuit 23 , a transformer 24 , a second rectifier 25 , a second filter 26 and an energy storage device. Wherein, the energy storage is a capacitor C27 , and the switch circuit 22 is a circuit composed of a first switch transistor 221 and a second switch tra...
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The converter of power source includes transformer, a control circuit, a switch circuit, a power accumulator, and current detection circuit. A reference current value is setup in advance for control circuit. The current detection circuit includes following parts: filter connected to power accumulator electrically in order to receive a voltage signal of the power accumulator, filter the voltage signal to obtain variation value of AC voltage; a rectifier connected to the filter to rectify the variation value of AC voltage in order to obtain value of positive half wave voltage; a differentiator connected to power accumulator and the control circuit to differentiate value of positive half wave voltage in order to obtain value of current variation of the accumulator, which is transferred to control circuit to be compared with reference current value. Based on result of comparison, whether the switch circuit is turned on or off is controlled.
Description
technical field [0001] The invention relates to a detection circuit and a power converter, in particular to a current detection circuit and a power converter with the current detection circuit. Background technique [0002] With the advancement of technology, computers have become an indispensable tool in life. However, computers, like general electrical appliances, need power to activate and operate. Therefore, the power supply can be said to be the power source of computers. Among them, the main function of the power supply is to convert the AC power provided by the general socket into DC power that can be used by the computer. Therefore, a good power supply must be reliable and meet all functional specifications, protection features, safety regulations, electromagnetic compatibility and other specific requirements. [0003] Please refer to FIG. 1( a ), which is a schematic circuit diagram of a conventional power supply. It can be seen from the figure that the power supp...
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IPC IPC(8): H02M3/28H02M3/325
Inventor 张世贤
Owner DELTA ELECTRONICS INC