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Power converter with output voltage level indicating devicePower converter with output voltage level indicating device description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20050285562, Power converter with output voltage level indicating device. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates generally to a power converter, and in particular to a power converter comprising an output voltage level indicating device for indication and easy reading of output level of voltage. [0003] 2. Description of the Prior Art [0004] Portable electronic appliances, such as mobile phone and notebook computer, play an important role in the modern world in doing business and society activities. Such portable appliances are often powered by built-in power sources, which must be constantly recharged in order to maintain operability of the portable appliances. Also, external powering is also available for most of the portable appliances, such as wall outlet, automobile electrical system including cigarette lighter socket and electrical socket regularly available in airplanes. Often the external powering must be converted by for example a conversion circuit made in the form of an adaptor before it can be supplied to the portable appliances. [0005] However, the portable appliances are often operated with different working voltages and for such a reason, the general consumers that own and use two or more different portable appliance must regularly bring two or more adaptors corresponding to those portable appliances. This complicates the use of the portable appliances and is very troublesome to the consumers. U.S. Pat. No. 6,628,535, issued to the present inventor, teaches a power converter that provides selectable output voltage levels to different appliances or loads. The power converter of the '535 Patent comprises an output to which a terminal connector is selectively coupled. The terminal connector comprises a circuit comprised of resistors that generates a feedback signal to a control circuit of the power converter, inducing a corresponding voltage level at the output of the conversion device. [0006] Such a conventional power converter works well in supplying voltage of different levels to electronic appliances that operates with different working voltages. It, however, is still unclear to a user what voltage level is being output by the power converter when the device is powering an electronic appliance. This may cause problem to the user. [0007] Thus, the present invention is aimed to provide a power converter that overcomes the drawback of the conventional devices. SUMMARY OF THE INVENTION [0008] An object of the present invention is to provide a power converter that is capable to display the output voltage level. The power converter comprises a display device for showing the voltage level at the output terminal of the level-selecting terminal device. [0009] Another object of the present invention is to provide a portable power converter with output voltage level display device. The power converter is engageable with various level-selecting terminal device. By means of the display device, the output voltage level at the output terminal of the level-selecting terminal device is shown. [0010] To achieve the above objects, in accordance with the present invention, there is provided a power converter with output voltage level indicating device. The power converter includes a casing, an interior of which is disposed with a control circuit. The control circuit includes a feedback circuit and a DC-to-DC conversion circuit. The feedback circuit is coupled to the DC-to-DC conversion circuit and connected to a level-selecting terminal by at least one resistor to provide a feedback signal to the DC-to-DC conversion circuit which in turn changes the voltage level of the DC output. An output socket is formed at the casing, which is connected with the control circuit. The output socket includes two primary, power terminals and at least one secondary, level-selecting terminals. A level-selecting terminal device is connected to the output socket via an extension cable for getting the DC voltage and supplying the DC voltage to an appliance via an output terminal. A display device is provided at the casing for showing the output voltage level to the output terminal of the level-selecting terminal device. BRIEF DESCRIPTION OF THE DRAWINGS [0011] The present invention will be apparent to those skilled in the art by reading the following description of preferred embodiments thereof, with reference to the attached drawings, in which: [0012] FIG. 1 is a perspective view of a power converter constructed in accordance with a first embodiment of the present invention with connection cables detached therefrom; [0013] FIG. 2 is a block diagram of a control circuit of the power converter of FIG. 1; [0014] FIG. 3 is a block diagram of a DC voltage level indicating circuit of FIG. 2; [0015] FIG. 4 is a perspective view of a second embodiment of the power converter in accordance with the present invention; [0016] FIG. 5 is a block diagram of the control circuit of the power converter of FIG. 4; [0017] FIG. 6 is a perspective view of a third embodiment of the power converter in accordance with the present invention; [0018] FIG. 7 is a perspective view of a fourth embodiment of the power converter in accordance with the present invention; [0019] FIG. 8 is a perspective view of a fifth embodiment of the power converter in accordance with the present invention; [0020] FIG. 9 a block diagram of the control circuit of the power converter of FIG. 8; and [0021] FIG. 10 is a perspective view of a sixth embodiment of the power converter in accordance with the present invention; Continue reading about Power converter with output voltage level indicating device... 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