Passive PFC valley-fill drive circuit and power supply device

Abstract

The utility model discloses a passive PFC (Power Factor Correction) valley-fill drive circuit and a power supply device, which comprise a rectifier module, an energy storage inductor L, an energy storage capacitor C201, an energy storage capacitor C202, a diode D201, a diode D203 and an adjusting assembly, the other end of the energy storage inductor L is connected with one end of the energy storage capacitor C210 and the negative electrode of the diode D203 and forms the positive electrode of the output end of the passive PFC valley-fill drive circuit, and the other end of the energy storage capacitor C201 is connected with one end of the adjusting assembly and the negative electrode of the diode D201. The positive electrode of the diode D203 is connected with the other end of the adjusting assembly and one end of the energy storage capacitor C202, the positive electrode of the diode D201 is connected with the other end of the energy storage capacitor C202 and forms the negative electrode of the output end of the passive PFC valley-fill type driving circuit, the adjusting assembly is used for setting the charging time of the energy storage capacitor C202, and the charging time of the energy storage capacitor C202 is set. The power factor is improved and the harmonic current is reduced with low cost, and the use requirements of users are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply equipment technical field especially relates to a passive PFC fill valley formula drive circuit and power supply unit. BACKGROUND

[0002] In order to solve the power factor and harmonic current problem of low power power supply, avoid the pollution of different degrees to the power grid, meet the use demand of low cost and small size simultaneously, the PFC power correction circuit is usually added in the existing power supply unit, but due to the application in low power power supply, considering the cost problem, the energy storage inductance and energy storage capacitor usually do not select the element with larger capacity and faster discharging speed, so that the improvement of power factor is limited, and usually can only reach about 0.8, and the harmonic current distortion degree can not meet the use demand of user. SUMMARY

[0003] The utility model discloses at least solve one of the technical problems in prior art. Therefore, the utility model provides a passive PFC fill valley formula drive circuit and power supply unit to improve the power factor and reduce harmonic current with lower cost.

[0004] The passive PFC fill valley formula drive circuit according to the first aspect of the utility model comprises: a rectification module, an input end of the rectification module is connected with a power supply; an energy storage inductance L, one end of the energy storage inductance L is connected with an output end of the rectification module; an energy storage capacitor C201, an energy storage capacitor C202, a diode D201, a diode D203 and an adjusting assembly, the other end of the energy storage inductance L is connected with one end of the energy storage capacitor C210, a negative electrode of the diode D203 respectively and forms the positive electrode of the output end of passive PFC fill valley formula drive circuit, the other end of the energy storage capacitor C201 is connected with one end of the adjusting assembly and the negative electrode of the diode D201 respectively, the positive electrode of the diode D203 is connected with the other end of the adjusting assembly and one end of the energy storage capacitor C202 respectively, the positive electrode of the diode D201 is connected with the other end of the energy storage capacitor C202 and forms the negative electrode of the output end of passive PFC fill valley formula drive circuit, and wherein, the adjusting assembly is used to set the charging time of the energy storage capacitor C202.

[0005] The passive PFC fill valley formula drive circuit according to the utility model embodiment has at least the following beneficial effects:

[0006] The utility model discloses passive PFC fill valley formula drive circuit, rectification module is to the alternating current rectification of power supply output, and then the current of rectification module output passes through energy storage inductance L energy storage and discharges, and energy storage inductance L discharges and charges energy storage capacitor C201, and energy storage capacitor C202 discharges through diode D203 and stabilizes the output voltage of passive PFC fill valley formula drive circuit output end, and when energy storage inductance L energy storage, energy storage capacitor C201 discharges, and energy storage capacitor C201 charges energy storage capacitor C202 through the adjustment component, and the adjustment component can set the charging time of energy storage capacitor C202, so that even if small capacity inductance element and capacitor element, through the setting of charging time, can make active power offset amount reduce, realize high power factor correction, and power factor can reach above 0.9, and the design improves power factor and reduces harmonic current with lower cost, satisfies the use demand of user.

[0007] According to some embodiments of the utility model, the adjustment component includes diode D202 and resistance R205, the positive pole of diode D202 is connected with the other end of energy storage capacitor C201 and the negative pole of diode D201 respectively, the negative pole of diode D202 is connected with one end of resistance R205, and the other end of resistance R205 is connected with the positive pole of diode D203 and one end of energy storage capacitor C202 respectively.

[0008] According to some embodiments of the utility model, the adjustment component includes semiconductor switch tube, the input end of switch tube is connected with the other end of energy storage capacitor C201 and the negative pole of diode D201 respectively, and the output end of switch tube is connected with the positive pole of diode D203 and one end of energy storage capacitor C202 respectively.

[0009] According to some embodiments of the utility model, passive PFC fill valley formula drive circuit further includes filter capacitor C203, one end of filter capacitor C203 is connected with the positive pole of the output end of passive PFC fill valley formula drive circuit, and the other end of filter capacitor C203 is connected with the negative pole of the output end of passive PFC fill valley formula drive circuit.

[0010] According to some embodiments of the utility model, the rectification module includes full-bridge rectification unit or full-wave rectification unit.

[0011] The power supply device according to the second aspect of the utility model includes the passive PFC fill valley formula drive circuit disclosed in any of the above embodiments.

[0012] The power supply device according to the embodiments of the utility model has at least the following beneficial effects:

[0013] The power supply device applies the passive PFC valley filling type driving circuit disclosed in any one of the above embodiments, and power factor and harmonic current are improved at low cost, and the use requirement of a user is met.

[0014] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description given below, taken in conjunction with the drawings in which:

[0016] Figure 1 It is a circuit schematic diagram of one of the embodiments of the passive PFC valley filling type driving circuit of the present application.

[0017] Reference signs:

[0018] Rectifying module 100; adjusting assembly 200. DETAILED DESCRIPTION

[0019] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0020] In the description of the present application, it should be understood that, if the orientation description is involved, for example, the orientation or position relationship indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0021] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the first, the second is described, it is only used for distinguishing the technical features for the purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or the sequence of the indicated technical features.

[0022] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0023] As Figure 1 The utility model discloses a passive PFC fill valley formula drive circuit, including rectifier module 100, energy storage inductance L, energy storage capacitor C201, energy storage capacitor C202, diode D201, diode D203 and adjusting assembly 200, the input of rectifier module 100 is connected with power supply, one end of energy storage inductance L is connected with the output of rectifier module 100, the other end of energy storage inductance L is connected with one end of energy storage capacitor C210, the negative pole of diode D203 respectively and forms the positive pole of the output of passive PFC fill valley formula drive circuit, the other end of energy storage capacitor C201 is connected with one end of adjusting assembly 200 and the negative pole of diode D201 respectively, the positive pole of diode D203 is connected with the other end of adjusting assembly 200 and one end of energy storage capacitor C202 respectively, the positive pole of diode D201 is connected with the other end of energy storage capacitor C202 and forms the negative pole of the output of passive PFC fill valley formula drive circuit, and wherein, adjusting assembly 200 is used for setting the charging time of energy storage capacitor C202.

[0024] Wherein, in some embodiments of the utility model, the rectifier module 100 can be constituted full -bridge rectifier unit by four rectifier diodes, or, the rectifier module 100 can also be full -wave rectifier unit.

[0025] Energy storage inductance L, energy storage capacitor C201 and energy storage capacitor C202 can all be selected in conventional inductive element, capacitor element, diode D201, diode D203 can select conventional rectifier diode element, utilizes the unidirectional conduction performance of rectifier diode element to prevent current backflow.

[0026] The utility model discloses passive PFC fill valley formula drive circuit, rectifier module 100 is to the alternating current rectification of power supply output, and then the current of rectifier module 100 is discharged through energy storage inductance L energy storage, and energy storage inductance L discharge charges energy storage capacitor C201, and energy storage capacitor C202 discharges through diode D203 and stabilizes the output voltage of passive PFC fill valley formula drive circuit output end, and when energy storage inductance L energy storage, energy storage capacitor C201 discharges, and energy storage capacitor C201 charges energy storage capacitor C202 through adjusting assembly 200, and adjusting assembly 200 can set the charging time of energy storage capacitor C202, so that even if small capacity inductance element and capacitor element, through the setting of charging time, can make active power offset amount reduce, realize high power factor correction, and power factor can reach above 0.9, and the design improves power factor and reduces harmonic current at lower cost, satisfies the use demand of user.

[0027] In some embodiments of the utility model, as shown in Figure 1 The adjusting assembly 200 includes a diode D202 and a resistor R205, the positive pole of the diode D202 is connected with the other end of the energy storage capacitor C201 and the negative pole of the diode D201 respectively, the negative pole of the diode D202 is connected with one end of the resistor R205, and the other end of the resistor R205 is connected with the positive pole of the diode D203 and one end of the energy storage capacitor C202 respectively.

[0028] The electric energy of energy storage capacitor C201 discharge can charge energy storage capacitor C202 through diode D202 and resistor R205, and by setting the resistance value of resistor R205, the charging time can be changed, so as to adjust the charging capacity, and then reasonably reduce the active power offset amount.

[0029] In some embodiments of the utility model, the adjusting assembly 200 includes a semiconductor switch tube, the input end of the switch tube is connected with the other end of the energy storage capacitor C201 and the negative pole of the diode D201 respectively, and the output end of the switch tube is connected with the positive pole of the diode D203 and one end of the energy storage capacitor C202 respectively.

[0030] The control module can be connected with the controlled end of the switch tube, the switch tube can be a triode, a MOS tube or a silicon controlled rectifier, the control module can be selected in MCU or CPU and its accessory circuit, the control module outputs a PWM signal to the switch tube, adjusts the size of the charging current, so as to adjust the charging capacity and reasonably reduce the active power offset amount.

[0031] In some embodiments of the utility model, as shown in Figure 1As shown, the passive PFC valley-fill driving circuit further comprises a filter capacitor C203, one end of the filter capacitor C203 is connected with the positive pole of the output end of the passive PFC valley-fill driving circuit, the other end of the filter capacitor C203 is connected with the negative pole of the output end of the passive PFC valley-fill driving circuit, and the filter capacitor C203 can filter the output voltage, so that the output voltage is more stable.

[0032] The power supply device according to the second aspect of the present application comprises the passive PFC valley-fill driving circuit disclosed in any one of the above embodiments.

[0033] The power supply device disclosed in any one of the above embodiments is applied to improve the power factor and reduce the harmonic current at a low cost, and meets the use requirements of users.

[0034] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0035] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A passive PFC valley-fill drive circuit, characterized in that, include: A rectifier module, wherein the input terminal of the rectifier module is connected to the power supply; An energy storage inductor L, one end of which is connected to the output terminal of the rectifier module; The circuit includes energy storage capacitors C201 and C202, diodes D201 and D203, and an adjustment component. The other end of the energy storage inductor L is connected to one end of the energy storage capacitor C201 and the negative terminal of diode D203, forming the positive terminal of the output of a passive PFC valley-fill drive circuit. The other end of the energy storage capacitor C201 is connected to one end of the adjustment component and the negative terminal of diode D201. The positive terminal of diode D203 is connected to the other end of the adjustment component and one end of the energy storage capacitor C202. The positive terminal of diode D201 is connected to the other end of the energy storage capacitor C202, forming the negative terminal of the output of the passive PFC valley-fill drive circuit. The adjustment component is used to set the charging time of the energy storage capacitor C202.

2. The passive PFC valley-fill drive circuit according to claim 1, characterized in that: The regulating component includes a diode D202 and a resistor R205. The positive terminal of the diode D202 is connected to the other end of the energy storage capacitor C201 and the negative terminal of the diode D202. The negative terminal of the diode D202 is connected to one end of the resistor R205. The other end of the resistor R205 is connected to the positive terminal of the diode D203 and one end of the energy storage capacitor C202.

3. The passive PFC valley-fill drive circuit according to claim 1, characterized in that: The regulating component includes a semiconductor switching transistor. The input terminal of the switching transistor is connected to the other end of the energy storage capacitor C201 and the negative terminal of the diode D201, respectively. The output terminal of the switching transistor is connected to the positive terminal of the diode D203 and one end of the energy storage capacitor C202, respectively.

4. The passive PFC valley-fill drive circuit according to claim 1, characterized in that, It also includes a filter capacitor C203, one end of which is connected to the positive terminal of the output terminal of the passive PFC valley-filling drive circuit, and the other end of which is connected to the negative terminal of the output terminal of the passive PFC valley-filling drive circuit.

5. A passive PFC valley-fill drive circuit according to claim 1, characterized in that, The rectifier module includes a full-bridge rectifier unit or a full-wave rectifier unit.

6. A power supply device, characterized in that, Includes the passive PFC valley-fill drive circuit as described in any one of claims 1 to 5.

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