A standby state ultra-low power supply

Abstract

The invention discloses an ultra-low power consumption power supply in a standby state, which includes a transformer TA, a switch circuit, a DC power supply circuit, a control unit, and a co-positive AC sampling circuit. : Step 1: When it is in the no-load state, the switch circuit is disconnected and the transformer TA is powered off; Step 2: The control unit sends a pulse signal every other time period T1 to turn on the switch circuit, and the positive AC sampling circuit obtains the sampling signal V1 And sent to the control unit; Step 3: The control unit compares the sampling signal V1 with the pre-stored no-load threshold V2, indicating that there is a load, and the control unit modulates the PWM signal according to the magnitude of the sampling signal V1. If it is no-load, return to step 1. It has simple circuit structure, small size, sensitive response, low cost and more complete functions.

Description

technical field [0001] The invention relates to an ultra-low power consumption power supply in a standby state, in particular to a control circuit of a lighting lamp. Background technique [0002] With the continuous improvement of energy protection and utilization requirements in various countries in the world, energy efficiency standards are also continuously improved, especially for no-load loss and conversion efficiency of electronic and electrical products. The internal structure of traditional transformers is basically composed of primary coils, secondary coils and silicon steel sheets. Due to the inherent copper loss and eddy current loss, the no-load standby power consumption is relatively large when the power is turned on and no load is connected, such as 300W. The standby power consumption of the transformer is generally 4-5W. The conventional control technology adopts relay control, which mainly realizes the on and off of the transformer, or the timing switch cont...

AI Technical Summary

Problems solved by technology

The internal structure of traditional transformers is basically composed of primary coils, secondary coils and silicon steel sheets. Due to the inevitable copper loss and eddy current loss, the no-load standby power consumption is relatively large when the power is on and no load is connected, such as 300W. The standby power consumption of the transformer is generally 4-5W. The conventional control technology adopts relay control, which mainly realizes the turn-on and cut-off of the transformer, or timing switch control, but this kind of control technology cannot solve the problem of no-load power of the transformer.

[0003] In addition, the current power supply with transformer no-load detection function developed by our company needs to detect the output of the secondary coil of the transformer. The circuit structure is loaded, the volume is large, the cost is high, and the function is not perfect, which needs further improvement.

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