Single-phase electronic type keyboard prepayment meter

Abstract

The invention discloses a single-phase electronic type keyboard prepayment meter which comprises an SOC interface circuit, a power supply circuit and a power failure detection circuit. The power failure detection circuit detects a direct current power source output by the power supply circuit. When the situation that the voltage of the direct current output by power supply circuit is larger than or equal to a preset voltage threshold valve is detected by the power failure detection circuit, the power failure detection circuit outputs a connecting signal to the SOC interface circuit, the SOC interface circuit operates normally. When the situation that the voltage of the direct current output by power supply circuit is smaller than or equal to the preset voltage threshold valve is detected by the power failure detection circuit, the power failure detection circuit outputs an interrupt signal to the SOC interface circuit, and the SOC interface circuit executes power failure data storage action. According to the single-phase electronic type keyboard prepayment meter, the power failure detection circuit can accurately detect the magnitude of the direct current output by the power supply circuit, and the reliability of the operation of the single-phase electronic type keyboard prepayment meter is guaranteed.

Description

technical field [0001] The invention relates to an instrument, in particular to a single-phase electronic keyboard prepaid electric energy meter, which belongs to the technical field of electrical instruments. Background technique [0002] At present, the prepaid energy meters used in the market use various technologies to achieve the purpose of recharging and paying fees, such as contact IC card recharging, non-contact radio frequency card recharging, and remote communication recharging. The above recharging methods have their own disadvantages: contact IC card recharging needs Only by inserting the IC card into the card slot can the charging service be realized. However, the card slot of the contact IC card is easily damaged and cannot be recharged; the recharge of the non-contact radio frequency card only needs to put the radio frequency card within the radio frequency range to realize the recharge service , although the non-contact radio frequency card does not need to i...

AI Technical Summary

Problems solved by technology

[0002] At present, the prepaid energy meters used in the market use various technologies to achieve the purpose of recharging and paying fees, such as contact IC card recharging, non-contact radio frequency card recharging, and remote communication recharging. The above recharging methods have their own disadvantages: contact IC card recharging needs Only by inserting the IC card into the card slot can the charging service be realized. However, the card slot of the contact IC card is easily damaged and cannot be recharged; the recharge of the non-contact radio frequency card only needs to put the radio frequency card within the radio frequency range to realize the recharge service , although the non-contact radio frequency card does not need to insert the radio frequency card into the card slot, but the non-contact radio frequency card is easily affected by the surrounding electromagnetic interference, which will cause card reading errors and affect the use; remote communication recharge realizes the recharge service through remote communication, although this method It avoids the disadvantages that the card slot is easy to be viciously damaged and is subject to surrounding electromagnetic interference. However, data transmission may be wrong during communication. The stability and reliability of this method need to be improved urgently

However, how the keyboard prepaid energy meter detects the power failure of the keyboard prepaid energy meter has not yet been made public.

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