High-efficiency medium-power power supply application circuit

Abstract

The utility model discloses a high-efficiency medium-power power supply application circuit, which comprises a module I, a module II and a module III, and is characterized in that the module I comprises a surge suppression circuit, an EMC (Electro Magnetic Compatibility) anti-interference circuit and a rectification output circuit, and the surge suppression circuit, the EMC anti-interference circuit and the rectification output circuit are used for providing power supply energy for a post-stage circuit; the performance of each circuit module is fully exerted in selection, the high-efficiency conversion ratio of the circuit can be obtained, and the cost ratio of a product can be reduced, so that the circuit does not adopt a negative side feedback control circuit and a synchronous rectification circuit, the synchronous rectification performance is not very high in the practical application of a medium-power section power supply, and the cost is increased; compared with a conventional scheme in the market, the TL431, an optocoupler feedback loop and a synchronous rectification circuit are saved, the cost can be saved by about 10%, the conversion efficiency is high, the working temperature is low, the service life is long, the protection function is complete, and the cost performance output is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power control circuit technical field, specifically relates to a kind of high-efficiency medium power supply application circuit. BACKGROUND

[0002] In the gradual increase in the application field of medium power supply (200-300W), how to improve the efficiency of power supply is the difficulty in application, to come out from the confusion of "low efficiency ratio", and the high-efficiency medium power segment power drive control circuit designed;Well solve the efficiency, cost problem of medium power segment LED drive controller, can meet the high PF value, low harmonic ERP value and standby power consumption standard requirement.Provide high-quality requirements, higher reliability and low production cost solution,

[0003] Defects and deficiencies of prior art:

[0004] 1) In the medium power supply (200-300W) drive controller on the market, the slightly worse ones are generally double-tube positive payment control mode, low efficiency, high heat and short service life, easy to damage.

[0005] 2) In the medium power supply (200-300W) drive controller on the market, the better ones are generally LLC half-bridge control mode, high efficiency, but high cost, reasonable parameter debugging difficulty is big.Parameter debugging is not appropriate.

[0006] 3) In the medium power supply (200-300W) drive controller on the market, some are also designed as multiple small power supplies stacked together.The cost of such a way is increased, and the mutual interference is large, and the power consumption is also difficult to achieve. INVENTION CONTENTS

[0007] The utility model aims at providing a kind of high-efficiency medium power supply application circuit to solve the problems raised in the above background technology.

[0008] To achieve the above object, the utility model provides the following technical scheme: a kind of high-efficiency medium power supply application circuit, including module one, module two, module three group, its characterized in that: the module one includes surge suppression circuit, EMC anti-interference circuit and rectifier output circuit, the surge suppression circuit, EMC anti-interference circuit and rectifier output circuit are used to provide power supply energy for the later stage circuit;

[0009] The module two includes power factor correction circuit, and the power factor correction circuit provides positive 400V power supply energy for the later stage circuit after correcting circuit power;

[0010] The module three includes a double-tube reverse payment primary side control circuit, which completes energy conversion output 24VDC and provides working energy for the load circuit.

[0011] Preferably, the power factor correction circuit includes IC1 control chip, resistance, diode, capacitor and electrolytic capacitor, and the IC1 control chip is electrically connected with the surge suppression circuit, the EMC anti-interference circuit and the rectifier output circuit, and the double-tube reverse payment primary side control circuit.

[0012] Preferably, the double-tube reverse payment primary side control circuit includes a half-bridge drive circuit IC2 control chip and an oscillation control circuit for improving circuit driving and conversion efficiency, the oscillation control circuit is an IC3 resonant primary side control chip, and the oscillation control circuit is electrically connected with the half-bridge drive circuit IC2 control chip.

[0013] Preferably, the surge suppression circuit, the EMC anti-interference circuit and the rectifier output circuit include a low-frequency filter, a diode, a variable resistance, a resistance, a field effect tube, an inductor and a capacitor which are electrically connected and combined into a module one.

[0014] Preferably, the module one, the module two and the module three are electrically connected and combined into a high-efficiency medium-power power supply application circuit for power control.

[0015] Preferably, the power factor correction circuit and the feedback control of the double-tube reverse payment primary side control circuit are combined and connected for medium-power power supply driving control.

[0016] Compared with the prior art, the technical effects and advantages of the high-efficiency medium-power power supply application circuit, the high-PF high-efficiency medium-power power supply driving control circuit and the design selected by the present application make the performance of each circuit module fully play, the high-efficiency conversion ratio of the circuit can be obtained, and the cost ratio of the product can be reduced. Therefore, the circuit does not adopt a negative side feedback control circuit and a synchronous rectification circuit, the synchronous rectification performance is not very high in the actual application of the medium-power segment power supply and the cost is increased, the circuit combination is easy to debug, the cost is low, the conventional scheme comparison in the market, the TL431 and the optical coupling feedback loop and the synchronous rectification circuit are saved, about 10% of the cost is saved, the conversion efficiency is high, the working temperature is low, the service life is long, the protection function is perfect, and the cost performance is high. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the high-efficiency medium-power power supply application circuit.

[0018] In the drawing, 1 is a module one, 2 is a module two, and 3 is a module three. DETAILED DESCRIPTION

[0019] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of the utility model protection.

[0020] Please refer to Figure 1 The utility model provides a technical scheme: a kind of high-efficiency medium power supply application circuit, including module one 1, module two 2, module three 3 composition, the module one 1 including surge suppression circuit, EMC anti-interference circuit and rectifier output circuit, the surge suppression circuit, EMC anti-interference circuit and rectifier output circuit are used to provide power supply energy for subsequent circuit;

[0021] The module two 2 includes power factor correction circuit, and the power factor correction circuit provides positive 400V power supply energy for subsequent circuit after circuit power correction;

[0022] The module three 3 includes double-tube reimbursement original side control circuit, and the double-tube reimbursement original side control circuit completes energy conversion output 24VDC, and provides working energy for load circuit.LLC as the power topology of full resonant soft switching, its biggest advantage is one three quadrant's class sinusoidal energy transmission superposition ZVS / ZCS original side soft switching technology.

[0023] High PF value high-efficiency medium power supply drive control circuit: this circuit is applied to improve the output efficiency ratio of power supply, reduce standby power and product cost. A brand-new design concept is used, and high-efficiency power factor correction circuit, double-tube reimbursement and original side feedback control combination control mode are selected.

[0024] The power factor correction circuit includes IC1 control chip, resistor, diode, capacitor and electrolytic capacitor, and the IC1 control chip is electrically connected with surge suppression circuit, EMC anti-interference circuit and rectifier output circuit, double-tube reimbursement original side control circuit, and the OB6573 of Meibao is selected as power factor correction (IC1), the chip is high in efficiency, and the circuit is simple and easy to debug.

[0025] High-efficiency medium power supply application circuit is composed of module one 1, module two 2 and module three 3, and the related elements of module one 1 complete surge suppression, EMC anti-interference and rectifier output circuit to provide power supply energy for subsequent circuit. The related elements of module two 2 complete power factor correction to provide positive 400V power supply energy for subsequent circuit. The related elements of module three 3 form double-tube reimbursement original side control circuit to complete energy conversion output 24VDC to provide working energy for load circuit.

[0026] Specifically, in use, through the double-tube flyback limited to the drain recovery path diode, there is a prerequisite for limiting the Lm+(Drain_low) end reflected voltage <VIN+ voltage, otherwise the flyback excitation energy will be recovered to the VIN capacitor together with the drain energy, resulting in abnormal output; therefore, the double-tube flyback has natural affinity with the Boost PFC circuit. After the input voltage is boosted to a higher voltage by the Boost PFC, the limitation on the reflected turns ratio can be relaxed, and a large turns ratio is used to reduce the resonant valley voltage value and thus improve the system efficiency.

[0027] LLC is a full-resonant soft-switching power topology, and its biggest advantage is a three-quadrant sinusoidal energy transmission superimposed with ZVS / ZCS primary and secondary soft-switching technology. Compared with the double-tube flyback single-quadrant energy transmission and the sawtooth peak current primary and secondary hard switching, the efficiency and EMC performance are more obvious with the increase of input power. Taking 240W 24V-10A as an example, the LLC resonant scheme efficiency can reach 93.5% at full load, while the double-tube flyback scheme is about 92.3% at full load, which is about 1.2% lower. Therefore, the double-tube flyback application has obvious power segment cost-effective interval, i.e. using the double-tube scheme in the 100-300W power segment can achieve similar efficiency performance as LLC. At the same time, it has the advantages of low voltage stress, complete drain energy recovery and high reliability.

[0028] The double-tube flyback primary side control circuit contains a half-bridge drive circuit IC2 control chip and an oscillation control circuit for improving circuit driving ability and conversion efficiency. The oscillation control circuit is an IC3 resonant primary side control chip, and the oscillation control circuit and the half-bridge drive circuit IC2 control chip are electrically connected. The circuit selects KP214 (IC3) of Bily, which is a high-performance quasi-resonant primary side control chip. The multi-mode primary side control method, high-efficiency quasi-resonance, low standby power consumption, and integrated line loss compensation function can obtain high-performance constant voltage output performance.

[0029] The surge suppression circuit, EMC anti-interference circuit and rectifier output circuit contain a low-frequency filter, a diode, a variable resistor, a resistor, a field effect transistor, an inductor, a capacitor electrically connected to form a module one 1. The half-bridge drive circuit EG12521 (IC2) of Kaizhengwei is selected to improve the circuit driving ability and conversion efficiency. The module one 1, module two 2 and module three 3 are electrically connected to form a high-efficiency medium-power power supply application circuit for power supply control. The feedback control of the power factor correction circuit and the double-tube flyback primary side control circuit is combined and connected to drive and control the medium-power power supply.

[0030] The circuit is composed of module one 1, module two 2 and module three 3, the module one 1 related elements complete surge suppression, EMC anti-interference and rectifier output circuit, and provide power supply energy for the subsequent circuit; the module two 2 related elements complete power factor correction, and provide positive 400V power supply energy for the subsequent circuit, and the module three 3 related elements compose double-tube reverse payment primary side control circuit to complete energy conversion output 24VDC, and provide working energy for the load circuit.

[0031] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A high efficiency medium power supply application circuit comprising of module one, module two, module three characterized in that: The module one includes surge suppression circuit, EMC anti-interference circuit and rectifier output circuit, which are used to provide power supply energy for the subsequent circuit; The module two includes power factor correction circuit, which provides 400V power supply energy for the subsequent circuit after power correction; The module three includes double-tube refunding primary side control circuit, which completes energy conversion output 24VDC and provides working energy for the load circuit.

2. A high efficiency medium power supply application circuit according to claim 1, characterized in that: The power factor correction circuit contains IC1 control chip, resistance, diode, capacitor and electrolytic capacitor, and the IC1 control chip is electrically connected with the surge suppression circuit, EMC anti-interference circuit and rectifier output circuit, and double-tube refunding primary side control circuit.

3. The high-efficiency medium-power power supply application circuit according to claim 1, characterized in that: The double-tube refunding primary side control circuit contains half-bridge drive circuit IC2 control chip and oscillation control circuit for improving circuit driving and conversion efficiency, the oscillation control circuit is IC3 resonant primary side control chip, and the oscillation control circuit is electrically connected with the half-bridge drive circuit IC2 control chip.

4. The high efficiency medium power supply application circuit of claim 1, wherein: The surge suppression circuit, EMC anti-interference circuit and rectifier output circuit contain low-frequency filter, diode, variable resistance, resistance, field effect tube, inductance and capacitor, which are electrically connected and combined into module one.

5. The high efficiency medium power power supply application circuit of claim 1, wherein: The module one, module two and module three are electrically connected and combined into high-efficiency medium power supply application circuit for power supply control.

6. The high efficiency medium power supply application circuit of claim 1, wherein: The feedback control of the power factor correction circuit and double-tube refunding primary side control circuit is combined and connected to perform medium power supply driving control.

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