Bus voltage detection method and device
The invention provides a bus voltage detection method and device, and the method comprises the steps: proportionally reducing the voltage of a high-voltage bus into a to-be-detected signal; comparing the to-be-detected signal with a direct-current voltage signal, and outputting a high-voltage side f...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention provides a bus voltage detection method and device, and the method comprises the steps: proportionally reducing the voltage of a high-voltage bus into a to-be-detected signal; comparing the to-be-detected signal with a direct-current voltage signal, and outputting a high-voltage side feedback signal; converting the high-voltage side feedback signal into a low-voltage side feedback signal through a digital isolator; adjusting the PWM duty ratio according to the level of the low-voltage side feedback signal, and outputting a PWM signal; converting PWM into an isolated PWM signal through a digital isolator; filtering the isolated PWM signal, and outputting a direct-current voltage signal; and judging whether the low-voltage side feedback signal meets a preset threshold condition or not, and if so, calculating to obtain the voltage to be measured according to the PWM duty ratio. According to the bus voltage detection method, isolated accurate detection of the bus voltage can be realized by using the |
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