Passive electromagnetic isolated signal converter
A signal conversion and electromagnetic isolation technology, applied in electrical signal transmission systems, signal transmission systems, instruments, etc., can solve problems such as inability to guarantee accuracy, inability to output constant current source signals, and inability to realize active processing of post-level signals. , to achieve the effect of improving performance and improving response speed
Active Publication Date: 2007-10-31
张姣如
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Problems solved by technology
This passive electromagnetic isolation signal transformation method has the following defects: (1) Because the rectification filter has no power supply, the active processing of the subsequent stage signal cannot be realized. When the load of the signal changes, the output signal amplitude changes accordingly, and it cannot be truly (2) Because the normal operation of the push-pull drive circuit shunts a part of the current, and the shunted signal cannot be compensated in the subsequent stage, so the nonlinearity is serious, and the accuracy cannot be guaranteed, usually only up to 0.2 level precision
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[0019] As shown in Figure 1 and Figure 2, the first embodiment includes a push-pull drive circuit, a coupling transformer T1, a rectification and filtering circuit, a signal conversion processing circuit, an energy acquisition circuit and a start-up circuit, and the start-up circuit is formed by the parallel connection of a capacitor C1 and a resistor R1 The starting circuit is connected in parallel to the input end of the push-pull drive circuit, and the positive end of the input current signal is connected to the positive input end of the energy harvesting circuit. In order to make the energy harvesting circuit work stably, a stable Voltage diode VZ, the anode of Zener diode VZ is connected to the starting circuit, and the cathode is connected to the positive end of the input current signal. The negative terminal of the input current signal is connected to the negative terminal of the startup circuit and the push-pull drive circuit. The output end of the energy harvesting ci...
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The invention discloses a massive electromagnetic isolation signal converter, which comprises a push-pull drive circuit, a coupling transformer, a rectification filter circuit, a signal transition processing circuit, a power acquisition circuit and starting circuit parallel with input end of push-pull circuit; the positive and negative ends of input current signal accesses respectively positive end of power acquisition end and negative end of starting and push-pull circuits; arranging two coils to output square wave of opposite phase and provide push-pull signal and synchronous rectification signal in inner transformer in power circuit. This invention can achieve high-standard precision of output signal.
Description
technical field [0001] The invention relates to a passive electromagnetic isolation signal converter suitable for isolation, transformation and transmission of 4-20mA standard current signals. Background technique [0002] The existing passive electromagnetic isolation signal converter includes a push-pull drive circuit, a coupling transformer, a rectification filter circuit and a signal processing circuit, and a constant current source signal of 4 to 20mA is input from the current input terminal; the inflowing current signal energy makes the push-pull drive circuit Start the vibration and make the push-pull drive circuit work, and perform chopping modulation on the current signal; the current signal energy is coupled to the secondary of the transformer through the transformer, and then processed by the rectification filter circuit and signal conversion processing circuit connected to the secondary and then output from the current terminal output. This passive electromagnet...
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IPC IPC(8): G08C19/02
Inventor 尹向前磨定敏
Owner 张姣如