Voltage-stabilizing power source integrated circuit with relay drive

Abstract

The invention provides a voltage-stabilizing power source integrated circuit with relay drive. The voltage-stabilizing power source integrated circuit comprises a voltage-reducing rectifier circuit and a voltage-stabilizing driving circuit, the voltage-reducing rectifier circuit is provided with a live wire connecting end, a null wire connecting end and an output end, the voltage-stabilizing driving circuit comprises a first switch circuit, a first logic driving circuit, a comparison circuit and a reference voltage generator, a comparison voltage input end of the comparison circuit is a VCCA end of the voltage-stabilizing driving circuit while a reference voltage input end of the comparison circuit is connected to an output end of the reference voltage generator, a first input end of the first logic driving circuit is an Hi end of the voltage-stabilizing driving circuit while a second input end of the same is connected with the output end of the comparison circuit, and an output end of the first logic driving circuit is connected with a triggering end of the first logic driving circuit. The voltage-stabilizing power source integrated reliability has the advantages that obvious limitation on voltage for turning on a relay is realized, and opening direction of a relay is improved.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a stabilized power supply integrated circuit driven by a relay. Background technique [0002] On the small household appliances such as coffee machines and electric irons on the market today, discrete device circuits are used to realize AC to DC + 5V regulated output, and discrete devices are used to control the switching action of relays. [0003] figure 1 The middle is the power supply circuit existing in the form of discrete devices in the prior art. Although the power supply circuit has the function of controlling the switching action of the relay, since the power supply circuit needs to use 1 NPN tube, 1 PNP tube, 7 resistors, 9 1 diode and 3 capacitors, so the disadvantages of this power supply circuit are: 1) The discrete device scheme needs to use at least 2 triodes, 5 diodes, 3 capacitors and several resistors to realize the voltage regulation of AC to DC +5V to realize control...

AI Technical Summary

Problems solved by technology

[0003] figure 1 The middle is the power supply circuit existing in the form of discrete devices in the prior art. Although the power supply circuit has the function of controlling the switching action of the relay, since the power supply circuit needs to use 1 NPN tube, 1 PNP tube, 7 resistors, 9 1 diode and 3 capacitors, so the disadvantages of this power supply circuit are: 1) The discrete device scheme needs to use at least 2 triodes, 5 diodes, 3 capacitors and several resistors to realize the voltage regulation of AC to DC +5V to realize control The switching function of the relay adopts four discrete diodes D61, D71, D81, and D91 and a resistor R71 to provide the protection port for the main control circuit. It occupies a large PCB area, and there are many solder joints of the device, resulting in a relatively high rate of defective processing. High; 2) The separation control circuit currently used in the market does not have a clear limit for the voltage that the relay is turned on. For example, when VCCA1 reaches about 13V, the relay will be turned on. At this time, the relay will be in a weak conduction state, and the relay spring 3) Among them, HI1 is the relay control signal input terminal, the emitter of NPN tube N11 needs to be grounded to conduct, and the relay will work at this time, so when the relay is working, the resistors R21, R31 and resistors R41 has a large power and consumes more energy, which increases the cost of use and is not conducive to energy saving

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