Drive power circuit and driving method of low-energy-consumption relay
A relay circuit and drive power technology, applied in relays, circuits, electrical components, etc., can solve the problems of serious heating of relays and low system efficiency, and achieve the effects of high working environment temperature, energy saving, and lower holding voltage.
Active Publication Date: 2014-07-16
SUNGROW POWER SUPPLY CO LTD
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Problems solved by technology
[0004] In view of this, it is necessary to provide a driving method for a low-energy relay drive power supply to solve the problems of severe relay heating and low system efficiency in the existing drive control technology when the relay is in normal use. While ensuring the reliable operation of the relay, Reduce the power consumption of the relay after normal pickup, prolong the service life of the relay, and improve the efficiency of the whole system
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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0029] The core of the low-energy relay driving power proposed by the present invention: when the primary coil of the relay has a current flowing through it, a magnetic field is generated to attract the magnetic material, and the other end is in contact with the reed due to the mechanical linkage, and the distance between the magnetic material and the magnetic material is relatively long when the relay is engaged. , It is necessary to overcome the spring stress to do work, so a large current is required to make the reed pull in, and then if it continues to maintain the pull-in state, only a small ho...
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The invention relates to a driving method of a drive power circuit of a low-energy-consumption relay. The drive power circuit comprises a power supply, at least one relay circuit connected in parallel, a CPU (central processing unit) control circuit and a DC (direct current) / DC converter. Each relay circuit comprises a switching tube and a relay, the switching tube, a coil of the relay and the power supply are connected in series, the CPU control circuit can transmit one relay control signal to a control electrode of one switching tube, the DC / DC converter is connected to the circuit between the power supply and the coil of each relay in series, an input end of the DC / DC converter is connected with the coil of each relay, an output end thereof is connected with the power supply, and a PWM (pulse-width modulation) signal control end of the DC / DC converter is connected to the CPU control circuit. At a zero time, the system is just electrified, the PWM output is a high level with the duty ratio of 1, the control signal of the relay is a low level; at a first time, the relay control signal output is the high level; at a second time, the PWM signal output of the CPU control circuit is a high frequency square wave signal with the duty ratio of D; and at a third time, the duty ratio of the PWM signal output is invariant.
Description
technical field [0001] The invention relates to the field of electric equipment control, in particular to a driving method for driving a power supply circuit of a low energy consumption relay. Background technique [0002] A relay is a control switch that controls a strong electric signal through a weak electric signal, so it is widely used in the field of industrial control. Since the relay can reliably disconnect the circuit when the reed contact is open, and has only a small contact resistance when the reed contact is closed, it is widely used in the field of photovoltaic power generation for inverters, grid side and PV array side on-off control. [0003] Existing technologies often use such as figure 1 The relay control scheme shown. Its working principle is: when the control level is low, the switch tube Q1 is cut off, no current flows through the primary coil of the relay, and the relay reed is separated; when the control level CON is high, the switch tube Q1 is tur...
Claims
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IPC IPC(8): H02M3/10H01H47/02
Inventor 王鼎奕孙维
Owner SUNGROW POWER SUPPLY CO LTD