CN201145716Y - Energy-saving burn-in equipment for switching power supply - Google Patents

Abstract

The utility model belongs to the technical field of the electronic product technique and specifically relates to an energy-conserving burn-in equipment of switching power supply, it includes the energy recovery unit, the output voltage end of more than two burnt switching power supplies is established ties, wherein the output of establishing ties is connected with the input of energy recovery unit, the output of energy recovery unit is connected with the electric wire netting or the AC input end of burnt switching power supply, the burn-in equipment that adopts above-mentioned structure can be established ties the output voltage end of a plurality of burnt switching power supplies, return most electric energy to the AC electric wire netting or the AC input end of burnt switching power supply through the energy recovery unit, thereby reach the purpose of energy-efficient burn-in; the utility model discloses a circuit unit less, the circuit loss is few, low in production cost, the reliability is high.

Description

A switching power supply energy-saving burn-in device

Technical field:

The utility model relates to the technical field of electronic products, in particular to a switching power supply energy-saving burner device.

Background technique:

The traditional burn-in method of switching power supply is to use a high-power resistor as a simulated load for burn-in (also known as aging test), which is a huge waste of electric energy. In recent years, there have been some patent technical documents, which feed back the electric energy consumed on the burn-in resistor to the input end of the switched-mode power supply to save electric energy. Burn-in device, the output voltage of each group of switching power supply of the burnt-in machine is boosted and constant current controlled by the DC/DC conversion circuit, and then the electric energy is fed back to the switching power supply of the burnt-in machine through a parallel diode and a DC voltage synthesis circuit input terminal. Since this AC/DC switching power supply energy-saving burn-in device needs to configure a DC/DC boost circuit and a constant current control circuit for each output voltage of the switched Losses such as loss are large, not only the production cost is high, but also the reliability is poor, which easily affects the burn-in efficiency of the switching power supply.

Utility model content:

The purpose of the utility model is to provide a switching power supply energy-saving burn-in device with a simple structure and a reduced production cost in view of the deficiencies in the prior art.

In order to achieve the above object, the technical solution adopted by the utility model is:

It includes an energy recovery unit, the output voltage terminals of two or more burned-in switching power supplies are connected in series, and the output terminals connected in series are connected to the input terminals of the energy recovery unit, and the output terminals of the energy recovery unit are connected to the grid or the AC of the burned-in switching power supply. The input terminal is connected, and a diode is connected in parallel at the output voltage end of each switching power supply of the burned machine, the cathode of the diode is connected with the positive terminal of the switched power supply of the burned machine, and the anode of the diode is connected with the negative terminal of the switched power supply of the burned machine.

The energy recovery unit includes a DC/DC circuit, a DC/AC circuit, a sine wave pulse width modulation and control circuit, the output end of the DC/DC circuit is connected to the input end of the DC/AC circuit, and the sine wave pulse width modulation and control circuit The output ends of the circuit are respectively connected with the input ends of the DC/DC circuit and the DC/AC circuit.

The DC/DC circuit is a half-bridge conversion circuit, a full-bridge conversion circuit or a push-pull conversion circuit.

The DC/AC circuit is a half-bridge conversion circuit or a full-bridge conversion circuit.

The output end of the DC/AC circuit is provided with an AC filter.

The AC filter is a low-pass filter.

The beneficial effects of the utility model are:

The utility model provides a switching power supply energy-saving burner equipment including an energy recovery unit, the output voltage terminals of more than two switched power supplies to be burned are connected in series, wherein the output terminals connected in series are connected to the input terminals of the energy recovery unit, and the energy recovery unit The output end is connected to the power grid or the AC input end of the switching power supply of the burnt-in machine. The burn-in equipment with the above structure can connect the output voltage terminals of multiple switching power supplies of the burnt-in machine in series, and return most of the electric energy to the power supply through the energy recovery unit. The AC power grid or the AC input end of the switching power supply of the burnt-in machine, so as to achieve the purpose of high-efficiency and energy-saving burn-in. Further, the energy recovery unit includes a DC/DC circuit, a DC/AC circuit, a sine wave pulse width modulation and a control circuit, which uses fewer circuit units, less circuit loss, low production cost and high reliability.

Description of drawings:

Accompanying drawing 1 is a structural block diagram of the utility model

Accompanying drawing 2 is the circuit schematic diagram of the utility model DC/DC circuit

Accompanying drawing 3 is the circuit schematic diagram of the utility model DC/AC circuit, sine wave pulse width modulation and control circuit

Detailed ways:

The utility model will be further described below in conjunction with the accompanying drawings. See accompanying drawings 1, 2, and 3. A switching power supply energy-saving burn-in device provided by the utility model includes an energy recovery unit 1, and more than two switched power supplies to be burned-in The output voltage ends of the series are connected in series, wherein the output end of the series connection is connected with the input end of the energy recovery unit 1, and the output end of the energy recovery unit 1 is connected with the grid or the AC input end of the switching power supply of the burnt machine, and the switching power supply of each burned machine A diode is connected in parallel at the output voltage end, the cathode of the diode is connected to the positive terminal of the switching power supply of the burnt machine, and the anode of the diode is connected to the negative terminal of the switching power supply of the burnt machine.

The energy recovery unit 1 includes a DC/DC circuit 11, a DC/AC circuit 12, a sine wave pulse width modulation and control circuit 13, the output end of the DC/DC circuit 11 is connected to the input end of the DC/AC circuit 12, and the sinusoidal The output terminals of the pulse width modulation and control circuit 13 are respectively connected to the input terminals of the DC/DC circuit 11 and the DC/AC circuit 12 .

The DC/DC circuit 11 is a half-bridge conversion circuit, a full-bridge conversion circuit or a push-pull conversion circuit, and the function of the DC/DC circuit 11 is to keep the output current of the switched power supply of the burned machine, that is, the DC/DC circuit 11 The input current is constant; it samples the output current of the switched power supply of the burned machine, compares it with the set burned machine current, and adjusts the drive pulse width of the internal power tube of the DC/DC circuit 11 to ensure the output of the burned machine power supply The current is constant.

The DC/AC circuit 12 is a half-bridge conversion circuit or a full-bridge conversion circuit, which adopts a sine wave pulse width modulation method to ensure grid-connected current and grid voltage by adjusting the driving pulse width of the power tube inside the DC/AC circuit 12 Same frequency and same phase, and at the same time ensure that the input DC voltage of the DC/AC circuit 12 is constant.

The output end of the DC/AC circuit 12 is provided with an AC filter 121 , the AC filter 121 is a low-pass filter, which includes an inductor L3 , and filters the AC current output by the DC/AC circuit 12 .

In the described DC/DC circuit 11, the output voltage terminals of the switching power supply of the burned-in machine are connected in series to obtain a DC high voltage of V1+V2+V3+...+Vn, and D1 is connected in parallel with the output of the switching power supply of the burned-in machine 1#, D2 is connected in parallel with the output of switching power supply 2# of the burnt machine, and so on, Dn is connected in parallel with the output of switching power supply n# of the burned machine. When a switching power supply of a burned-in machine fails and there is no output voltage at its output terminal, the parallel diode can ensure the normal operation of the series branch without affecting the operation of the entire device; wherein L1 and C1 form a filter circuit 111 for improving DC high voltage ripple current and voltage, R1 is the current sampling resistor to control the stability of the burn-in current; switching power tubes Q1, Q2, Q3, Q4, diodes D4, D5, D6, D7, capacitor C2 and pulse width modulation and The driving circuit constitutes a full-bridge conversion circuit 112, T1 is an isolated step-up high-frequency transformer, diodes D8, D9, D10, D11 connected to T1, an inductor L2, and a capacitor C3 constitute a high-frequency rectification and filtering circuit 113, and a high-frequency rectification and filtering circuit 113 The output voltage of T1 is rectified and filtered to 400V DC high voltage.

The capacitor C4 in the DC/AC circuit 12 further filters the 400V DC high voltage, and then the switching power transistors Q5, Q6, Q7, Q8, diodes D12, D13, D14, D15 and the sine wave pulse width modulation and control circuit 13 The formed full-bridge sine wave conversion circuit inverts the 400V DC high voltage into a sine wave voltage, and the sine wave voltage is sent to the AC power grid from the output end of the DC/AC circuit 12 to provide electric energy for the switching power supply of the burned-in machine.

Of course, the above are only preferred embodiments of the utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the utility model patent application are included in the utility model patent application within range.

Claims (6)

1, the energy-conservation burn-in device of a kind of Switching Power Supply, it is characterized in that: it comprises energy recovery unit, burnt the output voltage terminal series connection of machine Switching Power Supply more than two, wherein Chuan Lian output terminal is connected with the input end of energy recovery unit, the output terminal of energy recovery unit is connected with electrical network or by the ac input end of burning machine Switching Power Supply, each output voltage terminal that is burnt the machine Switching Power Supply is parallel with diode, the negative electrode of diode is connected with the anode that is burnt the machine Switching Power Supply, and the anode of diode is connected with the negative terminal that is burnt the machine Switching Power Supply.

2, the energy-conservation burn-in device of a kind of Switching Power Supply according to claim 1, it is characterized in that: described energy recovery unit comprises DC/DC circuit, DC/AC circuit, Sine Wave Pulse Width Modulation and control circuit, the output terminal of DC/DC circuit is connected with the input end of DC/AC circuit, and the output terminal of Sine Wave Pulse Width Modulation and control circuit is connected with the input end of DC/DC circuit, DC/AC circuit respectively.

3, the energy-conservation burn-in device of a kind of Switching Power Supply according to claim 2 is characterized in that: described DC/DC circuit is half-bridge change-over circuit, full-bridge change-over circuit or recommends change-over circuit.

4, the energy-conservation burn-in device of a kind of Switching Power Supply according to claim 2 is characterized in that: described DC/AC circuit is half-bridge change-over circuit or full-bridge change-over circuit.

5, the energy-conservation burn-in device of a kind of Switching Power Supply according to claim 2, it is characterized in that: the output terminal of described DC/AC circuit is provided with alternating current filter.

6, the energy-conservation burn-in device of a kind of Switching Power Supply according to claim 5, it is characterized in that: described alternating current filter is a low-pass filter.

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