Power supplying converter with failure-to-safety characteristic
A power converter and fail-safe technology, which is applied in the direction of conversion equipment with intermediate conversion to AC, conversion devices for adjusting electrical variables, and output power, etc., can solve the problems of large transformer volume and large overall volume of the converter, and achieve reduction The effect of small volume
Active Publication Date: 2009-12-23
BEIJING HOLLYSYS
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Problems solved by technology
[0004] However, the main problem of this circuit is that the volume of the transformer is too large due to the low input pulse frequency, so that the overall volume of the converter is too large, and the input power needs ±15VDC dual power supply.
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[0032] In the power converter with fail-safe characteristics, the differential circuit receives the low-frequency input pulse, and sends it to the low-frequency isolation transformer after differential amplification; the low-frequency rectification and filtering circuit receives the signal sent by the low-frequency isolation transformer, and sends it to the high-frequency isolation transformer after rectification and filtering. The high-frequency multivibrator circuit is converted into a high-frequency signal, and the high-frequency signal is sent to the high-frequency isolation transformer after being amplified; the high-frequency rectification and filtering circuit receives the signal sent by the high-frequency isolation transformer, and forms an output power supply after rectification and filtering.
[0033] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0034] One of the preferred embodiments ...
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The invention discloses a power converter with fail-safe characteristics, comprising: a differential circuit for receiving low-frequency input pulses, which are amplified and then sent to a low-frequency isolation transformer; a low-frequency rectification and filter circuit for receiving signals sent by the low-frequency isolation transformer , After rectification and filtering, it supplies power to the high-frequency multivibrator circuit. The high-frequency multivibrator circuit converts low-frequency signals into high-frequency signals, and the high-frequency signals are amplified and sent to high-frequency isolation transformers; high-frequency rectification and filter circuits , to receive the signal sent by the high-frequency isolation transformer, and output it after rectification and filtering. Because the power of the high-frequency oscillator is provided by low-frequency pulses, the entire circuit is fail-safe, and even if any of the components is damaged, it will not cause a wrong output power.
Description
technical field [0001] The invention relates to a low-power DC-DC converter, in particular to a power converter with fail-safe characteristics. Background technique [0002] In order to meet the key requirement of fail-safe, that is, any internal device damage will not cause the power supply to output drive current, the circuit of the low-power DC-DC converter cannot be designed as a monostable trigger to control the external power switch, because in the monostable trigger When it is damaged, the output may be enabled all the time, which will cause the external power switch to be closed all the time, which is not allowed to happen. [0003] Such as figure 1 As shown, in the prior art, when there is a pulse input at the input end of the circuit, the two transistors perform a push-pull output, and the output is a direct current after being rectified by a transformer and a bridge. When the input is not a pulse (may be -15V, 0V or suspended), there will be no AC current throug...
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IPC IPC(8): H02M3/28H02M3/335
Inventor 王弢吴冬书史洪源
Owner BEIJING HOLLYSYS