A driving high-p power circuit
By introducing an auxiliary circuit into the high-P power supply circuit and using the electromagnetic induction of the transformer to power the conversion chip, the problems of low efficiency and high cost in the existing technology are solved, and high conversion efficiency and low cost improvement are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI AOPU LIGHTING CO LTD
- Filing Date
- 2025-08-13
- Publication Date
- 2026-07-14
AI Technical Summary
The conversion efficiency of existing high-P power supply circuits is between 0.88 and 0.90, which is insufficient to meet the market's demand for high luminous efficacy, and existing improvement solutions are costly.
An auxiliary circuit is introduced into the high-P power supply circuit. The secondary winding of the transformer compensates for the charge of the charging filter capacitor at the power supply terminal of the conversion chip. The electromagnetic induction of the transformer is used to power the chip, reducing the attenuation during capacitor discharge and improving the conversion efficiency.
The conversion efficiency of the power supply circuit has been improved to over 0.95, while the improvement cost has been reduced, and the power consumption and heat loss of the auxiliary circuit are small.
Smart Images
Figure CN224503236U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power supply circuit technical field, concretely is a kind of drive high P power supply circuit. BACKGROUND
[0002] In drive high P power supply circuit, the required DC voltage of AC input is converted and output by power Buck or Boost non-isolation chip circuit design to provide load, so that load can work normally.Efficiency value refers to the efficiency ratio of the power loss of AC voltage conversion required DC voltage in conversion to apparent power.In power supply circuit, the higher the value, the better the benefit, and the higher the full use of electric energy.Over time, the conventional circuit power supply efficiency in lighting high P power supply product is between 0.88-0.90, so most of the circuit design does not consider the requirement of efficiency. Figure 1 For example, a highly integrated constant-current LED power switch chip with model KP106XP, the internal high-voltage MOSFET will be periodically turned off and turned on during the conversion output process of the chip, when the internal high-voltage MOSFET is turned off, the input power positive electrode connected to the high-voltage MOSFET drain pin end through the internal voltage stabilizer of the chip extracts part of the current to charge the power supply end capacitor, and when the MOSFET is turned on, the voltage stabilizer stops working, and the chip relies on the power supply end capacitor to maintain stable operation, but the voltage of the capacitor will decay during discharge, which affects the conversion efficiency of the conversion chip, and the efficiency is between 0.88-0.90.
[0003] However, with the increasing popularity of energy concept, various markets require higher and higher light efficiency from high P products in standards, and require the use of small power to meet the light efficiency of previous high power.In order to achieve the above requirements, the prior art usually modifies the circuit greatly, changes the design, resulting in a substantial increase in cost. UTILITY MODEL CONTENTS
[0004] The utility model aims at providing a drive high P power supply circuit which effectively improves conversion efficiency and effectively reduces improvement cost.
[0005] The utility model is realized as follows:
[0006] The utility model provides a drive high P power supply circuit, including conversion chip U1, the drain end of conversion chip U1 is connected with the positive pole of input power supply, the constant current output loop compensation end of conversion chip U1 is connected with chip reference ground terminal and the one end of sampling resistance respectively through first capacitance CS1, the other end of sampling resistance is connected with the current sampling input end of conversion chip U1, the current sampling input end of conversion chip U1 is connected with the cathode of first freewheeling diode D1, the anode of first freewheeling diode D1 is connected with input power supply negative pole, the chip power supply end of conversion chip U1 is connected with chip reference ground terminal through charge filter capacitance CS2, the chip power supply end of conversion chip U1 is connected with the auxiliary circuit for power supply compensation, sampling resistance is connected with the positive pole of load through the auxiliary circuit, the demagnetization detection end of conversion chip U1 is connected with the voltage dividing resistance for detecting the demagnetization time of auxiliary circuit.
[0007] Further, the auxiliary circuit includes a transformer having one end of a primary winding T1 connected to the positive pole of the load, another end of the primary winding T1 of the transformer connected to the sampling resistance, the primary winding T1 of the transformer connected in parallel with the voltage dividing resistance, one end of a secondary winding T1A of the transformer connected to the sampling resistance, the secondary winding T1A of the transformer used for compensating the power supply compensation of the charge filter capacitance CS2, another end of the secondary winding T1A of the transformer connected to the anode of a second freewheeling diode D2, the cathode of the second freewheeling diode D2 connected to the chip power supply end of the conversion chip U1 through a filter resistance R7.
[0008] Compared with the prior art, the utility model has the advantages that:
[0009] The utility model provides the power supply compensation for the chip power supply end through the auxiliary circuit, improves the conversion efficiency, only makes small range modification to the existing peripheral circuit, and reduces the improvement cost. BRIEF DESCRIPTION OF DRAWINGS
[0010] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled person in the art, other related drawings can be obtained according to these drawings without the creative labor.
[0011] Figure 1 It is the circuit schematic diagram of the prior art;
[0012] Figure 2 It is the circuit schematic diagram of the utility model. DETAILED DESCRIPTION
[0013] In order to make the purposes, technical schemes and advantages of the embodiments of the utility model clearer, the technical schemes in the embodiments of the utility model will be clearly and completely described in the following with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0014] Please refer to Figure 2 A drive high P power supply circuit, including conversion chip U1, the drain end of the conversion chip U1 is connected with the positive pole of input power supply, the constant current output loop compensation end of the conversion chip U1 is connected with the chip reference ground end and the one end of sampling resistance respectively through the first capacitor CS1, the other end of the sampling resistance is connected with the current sampling input end of the conversion chip U1, the current sampling input end of the conversion chip U1 is connected with the cathode of the first freewheeling diode D1, the anode of the first freewheeling diode D1 is connected with the negative pole of input power supply, the chip power supply end of the conversion chip U1 is connected with the chip reference ground end through the charge filter capacitor CS2, the chip power supply end of the conversion chip U1 is connected with the auxiliary circuit for power supply compensation, the sampling resistance is connected with the positive pole of load through the auxiliary circuit, the demagnetization detection end of the conversion chip U1 is connected with the voltage dividing resistance for detecting the demagnetization time of the auxiliary circuit.
[0015] Please refer to Figure 2 The auxiliary circuit includes the transformer with one end of the main winding T1 connected with the positive pole of load, the other end of the main winding T1 of the transformer connected with the sampling resistance, the main winding T1 of the transformer is connected with the voltage dividing resistance in parallel, one end of the auxiliary winding T1A of the transformer is connected with the sampling resistance, the auxiliary winding T1A of the transformer is used for compensating the power supply compensation of the charge filter capacitor CS2, the other end of the auxiliary winding T1A of the transformer is connected with the anode of the second freewheeling diode D2, the cathode of the second freewheeling diode D2 is connected with the chip power supply end of the conversion chip U1 through the filter resistance R7.
[0016] In practical application, the sampling resistance connected through the current sampling input end samples the main winding inductance current of the transformer, realizes the current closed loop control, and further realizes the high precision current output; the voltage of the voltage dividing resistance connected through the demagnetization detection end is detected, the demagnetization time of the main winding of the transformer is realized, the internal high voltage power MOSFET is turned on at the end of the current freewheeling of the main winding of the transformer each time, the utility model utilizes the electromagnetic induction of the secondary winding and the main winding of the transformer, takes electricity from the main winding, specially charges the power supply end of the conversion chip U1 charging filter capacitor CS2, supplies power to the attenuation of the discharge of the charging filter capacitor CS2, and further improves the working efficiency of the conversion chip U1; the loss of the auxiliary circuit is low through the transformer power supply, and the normal output of the output circuit is not affected, so that the power efficiency of the whole circuit is improved; by increasing an auxiliary circuit to compensate the power supply loss of the power supply end, the conversion efficiency is effectively improved, only the existing peripheral circuit is modified in a small range, the improvement cost is reduced; and the power consumption of the auxiliary circuit is small, the transformer filter electrolysis is small, the heat loss of the power supply is small, and the heat loss of the power supply is small; the utility model improves the traditional peripheral circuit of the conversion chip U1 by small range improvement, improves the traditional power output efficiency 0.90 to more than 0.95, effectively improves the conversion efficiency, and reduces the improvement cost.
[0017] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A high-P power supply driving circuit, comprising a conversion chip U1, wherein the drain terminal of the conversion chip U1 is connected to the positive terminal of the input power supply, the constant current output loop compensation terminal of the conversion chip U1 is connected to the chip reference ground and one end of a sampling resistor via a first capacitor CS1, the other end of the sampling resistor is connected to the current sampling input terminal of the conversion chip U1, the current sampling input terminal of the conversion chip U1 is connected to the cathode of a first freewheeling diode D1, the anode of the first freewheeling diode D1 is connected to the negative terminal of the input power supply, and the chip power supply terminal of the conversion chip U1 is connected to the chip reference ground via a charging filter capacitor CS2, characterized in that: The power supply terminal of the conversion chip U1 is connected to an auxiliary circuit for power supply compensation. The sampling resistor is connected to the positive terminal of the load through the auxiliary circuit. The demagnetization detection terminal of the conversion chip U1 is connected to a voltage divider resistor for detecting the demagnetization time of the auxiliary circuit.
2. The high-P driving power supply circuit according to claim 1, characterized in that, The auxiliary circuit includes a transformer with one end of the main winding T1 connected to the positive terminal of the load, the other end of the main winding T1 connected to the sampling resistor, the main winding T1 connected in parallel with the voltage divider resistor, one end of the secondary winding T1A connected to the sampling resistor, the secondary winding T1A used to compensate for the power supply compensation of the charging filter capacitor CS2, the other end of the secondary winding T1A connected to the anode of the second freewheeling diode D2, and the cathode of the second freewheeling diode D2 connected to the chip power supply terminal of the conversion chip U1 through the filter resistor R7.