Non-isolating switching power supply with high efficiency and high current regulation ratio

A technology of switching power supply and switching power supply circuit, which is applied in the direction of high-efficiency power electronic conversion, conversion of AC power input to DC power output, electrical components, etc., which can solve problems such as unsatisfactory, low power factor and output current adjustment rate, and achieve cost reduction. Effects of reduction, calorific value reduction, and volume reduction

CN105471293APending Publication Date: 2016-04-06张光阳
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-04-06

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Abstract

The invention relates to a non-isolating switching power supply with high efficiency and a high current regulation ratio. The power-supply efficiency can be up to 98% and considerably exceeds 90% power-supply efficiency of an existing switching power supply; and the most important feature is that the output current regulation ratio of the power supply even reaches five per hundred thousand per volt, and considerably exceeds the level of the similar power supply at present. The power supply is small in volume; the number of used elements can be as low as15; and a cooling fin is not needed, so that the cost is low. The output power of the non-isolating switching power supply can reach 150W; the output voltage can be up to 300V; and the lowest output voltage is 0V, so that a short circuit can be achieved; and the non-isolating switching power supply can also have a dimming function. If the non-isolating switching power supply is applied to an LED lamp, the technical problems that an existing drive power supply for the LED lamp is relatively high in energy consumption, not high enough in power-supply efficiency, poor in stability, easy to damage and the cooling fin is a mustare solved.
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Description

technical field

[0001] The invention relates to a non-isolated switching power supply device with high efficiency and high current adjustment rate, which has particularly high efficiency and good current stabilization effect, can be used as a power supply for various electrical appliances, and is especially suitable as a driving power supply for LED lamps. Background technique

[0002] The most widely used switching power supply is an isolated switching power supply, and its efficiency is generally between 80-90%, which means serious heat generation, a lot of wasted energy, and a heavy heat dissipation burden; and the volume is also large. At present, the integrated non-isolated switching power supply HA22004PB (belonging to the HA220XXPB series) is available on the market (available on the Internet), and is considered to be the best power supply of the same type. Its optimal output voltage range is 150-180 volts. The current outside the range changes rapidly with the voltag...

Examples

Embodiment 1

[0024] Example 1: A new high-efficiency high-current regulation non-isolated switching power supply

[0025] Such as figure 1 Shown: a non-isolated switching power supply with high efficiency and high current adjustment rate, including rectification and filtering circuit, switching power supply circuit, inductive energy storage recovery circuit and output constant current circuit; where:

[0026] In the rectification circuit composed of rectifier bridge stacks, the input terminals of the rectifier bridge stack Br1 are connected to 220 volts AC mains, and one end of its output is grounded and the other end outputs voltage V+. Between the output voltage line V+ and the ground line A filter capacitor C2 is indirectly installed to form the rectification filter circuit;

[0027]The switching power supply circuit is composed of an inductor L3, a resistor R5, a field effect transistor F8, a Zener diode D9, a capacitor C10, a transistor T11, a resistor R12, a resistor R13, and a capa...

Embodiment 2

[0033] Embodiment 2: Non-isolated switching power supply with high efficiency and high current regulation rate with constant current source as the load of FET gate electrode circuit

[0034] Such as figure 2 As shown, replace the load resistor R5 in the gate circuit of the field effect transistor F8 with a constant current source composed of a resistor R17, a Zener diode D18, a transistor T19 and a resistor R20, where the collector of the transistor T19 is connected to the V1 voltage line, Its emitter is connected to the output voltage line V+ of the rectifier circuit through a resistor R17, one of its bases is grounded to GND through a resistor R20, and the other base is connected to the output voltage line V+ of the rectifier circuit through a Zener diode D17, so that It can improve the adjustment rate of the output current of the power supply.

[0035] The circuit of this embodiment is relatively complicated, but the current adjustment rate is very high, which can reach 5...

Embodiment 3

[0036] Embodiment 3: A non-isolated switching power supply with high efficiency and high current adjustment rate with a capacitor on the input arm of the rectifier bridge stack

[0037] Such as image 3 As shown, the resistor R5 connected to the gate of the field effect transistor F8 and the output voltage line V+ is replaced by a constant current source composed of a resistor R17, a Zener diode D18, a transistor T19 and a resistor R20, and an input of the bridge stack Br1 A capacitor C21 that reduces the input voltage of the bridge stack is connected in series between the arm and the 220 volt mains. The circuit in this embodiment is the most complicated. Not only is the current adjustment rate very high, it can reach 5 / 100,000 per volt, and the output voltage can be easily reduced. To a very low level, even the output short circuit will not damage the circuit, it is very practical for occasions with high technical requirements or low voltage power supply.