CN102300352A - A power supply without electrolytic capacitor - Google Patents

Abstract

The invention discloses a power supply without electrolytic capacitor, which comprises a rectifying device, a filter, a loop detection device, a diode, a triode, an inductor, a power supply manager and an LED. The invention provides a power supply suitable for LED driving, which breaks through the limitation of short service life of an electrolytic capacitor and greatly improves the service life of a product.

Description

A power supply without electrolytic capacitor

technical field

The invention relates to a power supply, in particular to a power supply without an electrolytic capacitor.

Background technique

Traditional power supplies require electrolytic capacitor filtering at both the input and output ends. The electrolytic capacitor fails due to the dry electrolyte, and the service life of the power supply is limited.

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Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a power supply, especially a power supply without an electrolytic capacitor.

The technical solution adopted by the present invention to solve the technical problem is: a power supply without electrolytic capacitors, including rectifiers, diodes, filters, loop detection devices, triode amplifiers, inductors, power managers and LEDs;

The input end of the rectification device is connected to the input end of the power supply;

The output end of the rectifying device is divided into two paths, one path is connected with a diode and a filter in turn, and the output end of the filter is respectively connected with the first pin of the power manager U1 and the cathode of the LED; the other path is connected with the loop detector The measuring device, triode amplifier, power manager, diode, freewheeling inductor and the anode of the LED are connected in sequence.

In the power supply of the present invention, the rectification device is provided with a solid capacitor for absorbing the surge interference at the input end of the power supply.

In the power supply of the present invention, the filter is a pie filter composed of two solid capacitors and two inductors.

In the power supply of the present invention, a fuse is connected between the input end of the rectification device and the input end of the power supply.

In the power supply of the present invention, the triode amplifier includes a diode, a triode, a resistor, and a solid capacitor, the cathode of the diode is connected to the base of the triode, and the collector of the triode is connected to the third pin of the power manager. A solid capacitor is connected between the collector of the triode and the fourth pin of the power manager; a resistor is connected between the base, collector and emitter of the triode and the fourth pin of the power manager.

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The power supply of the present invention adopts electrolytic capacitor technology, breaks through the limitation of short life of electrolytic capacitors, and greatly improves the service life of products. Compared with the prior art, it has significant progress and outstanding contributions , and is practical and can generate The effect of implementing the technical solution is not only low in cost, but also environmentally friendly.

Description of drawings

FIG. 1 is a circuit structure diagram of an electrolytic capacitor according to an embodiment of the present invention.

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Detailed ways

The present invention will be further described below in conjunction with accompanying drawings and embodiments, as shown in Figure 1, is the circuit structure diagram of the non-electrolytic capacitor of the power supply of the present invention, a kind of power supply without electrolytic capacitor, comprises rectifying device, filter, circuit detection Measuring devices, diodes, triode amplifiers, inductors, power managers and LEDs. The input end of the rectification device is connected to the input end of the power supply; the output end of the rectification device DB1 is divided into two paths, one path is connected to the isolation diode D1 and the filter, and the output ends of the filter are respectively connected to the power manager U1 The first pin Vin of the LED is connected to the cathode of the LED; the other is connected to the loop detection device (R7, R8, C7), the triode amplifier, the power manager U1, the diode D2, the freewheeling inductor T1 and the anode of the LED in sequence.

The triode amplifier includes a diode D4, a transistor Q1, a resistor, and a solid capacitor. The cathode of the diode D4 is connected to the base of the transistor Q1, and the collector of the transistor is connected to the third pin CL of the power manager. A solid capacitor C6 is connected between the collector of the triode and the fourth pin S of the power manager; a resistor is connected between the base, collector, and emitter of the triode and the fourth pin S of the power manager , respectively R9, R11, R10. The second EX of the power manager, the fifth pin VDD and the fourth pin S are connected with solid capacitors, which are respectively C5 and C4; the second pin EX of the power manager and the fifth pin VDD A resistor R5 is connected between them.

The anode of the diode D2 is connected to the sixth pin D of the power manager U1, a diode D3 is connected between the cathode of the diode D2 and the cathode of the LED, and the anode of the diode D3 is connected to the cathode of the LED; a solid capacitor C8 and resistor R6 are connected in parallel with LED respectively.

The rectifier is provided with a solid capacitor C1 to absorb the surge interference at the input end of the power supply.

The filter is a pie filter composed of two solid capacitors (C2, C3) and two inductors (L1, L2).

A fuse F1 is connected between the input end of the rectifying device and the input end of the power supply.

Resistors R1 and R2 are connected in series between the output terminal of the rectifying device DB1 and the collector of the triode Q1.

The working principle of the present invention is as follows: the mains power is connected to the rectifier bridge DB1 through the fuse F1, and the X capacitor C1 absorbs the surge interference at the input end, and at the same time suppresses the conduction interference (EMI) of the power supply to the power grid. After the mains is rectified by the rectifier bridge DB1, the alternating current (AC) voltage becomes a pulsed direct current (DC) voltage. This pulsed DC voltage is divided into two circuits: one is isolated by diode D1, and then filtered by a pie filter composed of C2/C3/L1, and the filtered voltage is sent to power manager U1 and LED to provide energy for LED; the other All the way through the R/C circuit to detect the change of the DC voltage, the voltage signal is amplified by the transistor Q1 and sent to the third pin (CL) of the IC, and the IC adjusts the duty cycle of the output pin D according to the signal collected by the third pin, and cooperates with the inductor T1 and the freewheeling diode D3 output a constant current to drive the LED to emit light. the

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields, are all the same. The theory is included in the patent protection scope of the present invention.

Claims (5)

1. the power supply of a no electrolytic capacitor is characterized in that, comprises rectifying device, diode, filter, loop arrangement for detecting, triode amplifier, inductance, power supervisor and LED;

The input of described rectifying device is connected with the input of power supply;

The output of described rectifying device is divided into two-way, and one the tunnel is connected successively with diode, filter, and the output of described filter is connected with the negative electrode of power supervisor U1, LED respectively; Another road is connected successively with the anode of loop arrangement for detecting, triode amplifier, power supervisor, diode, afterflow inductance and LED.

2. power supply according to claim 1 is characterized in that, described rectifying device is provided with the solid electric capacity of the input surging interference that absorbs power supply.

3. power supply according to claim 1 is characterized in that, described filter is to send mode filter by what two solid electric capacity and two inductors were formed.

4. power supply according to claim 1 is characterized in that, is connected with fuse between the input of described rectifying device and the input of power supply.

5. power supply according to claim 1, it is characterized in that, described triode amplifier comprises diode, triode, resistance, solid electric capacity, the negative electrode of described diode is connected with the base stage of triode, the collection utmost point of described triode is connected with the 3rd pin of power supervisor, is connected with solid electric capacity between the collection utmost point of triode and the 4th pin of power supervisor; All be connected with resistance between the 4th pin of the base stage of described triode, the collection utmost point, emitter-base bandgap grading and power supervisor.

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