WO2016077961A1

WO2016077961A1 - Power supply sine wave sampling circuit and led emergency light

Info

Publication number: WO2016077961A1
Application number: PCT/CN2014/091279
Authority: WO
Inventors: 许国伟; 黄鹤鸣; 肖灵
Original assignee: 深圳市聚作照明股份有限公司
Priority date: 2014-11-17
Filing date: 2014-11-17
Publication date: 2016-05-26

Abstract

Provided are a power supply sine wave sampling circuit and an LED emergency light; the power supply sine wave sampling circuit comprises a sampling module (100), an optocoupler isolation module, and a signal output module (300); the sampling module (100) is connected between an AC power supply and an input terminal of the optocoupler isolation module (200); the output terminal of the optocoupler isolation module (200) is connected to the signal output module (300) which outputs the sine wave. The power supply sine wave sampling circuit accomplishes isolated sampling of AC and DC signals, and the circuit configuration is simple and reliable. In addition to complying with the fire emergency lighting standard GB_17945-2010, the design of the LED emergency light also meets the 3C and CE standards, such that the product has a broadened range of applications.

Description

Power sine wave sampling circuit and LED emergency light

Technical field

The utility model relates to the field of LED circuits, in particular to a power supply sine wave sampling circuit and an LED emergency light.

Background technique

LED (Light-Emitting) Diode, LED) lighting products are now in the mature application stage. At the front end is commercial lighting. There are many types of commercial lighting fixtures, and there must be a certain proportion of power-off emergency lighting fixtures. At present, the traditional fluorescent lamp emergency system is mostly used, and some of the LED lamps directly replace the emergency lamp fluorescent lamp, but the efficiency is low and the cost is high. Moreover, the traditional emergency light chip control is used, and the chip needs to sample the alternating current signal as a reference to work. Since the traditional emergency light chip is non-isolated, the sine wave signal that needs to be sampled during operation can be directly sampled, and the newly developed LED emergency light control system uses an isolated circuit. It is not possible to directly sample a sine wave signal.

technical problem

The utility model provides a power supply sine wave sampling circuit, which solves the problem that the sampling circuit in the prior art has high cost and does not sample the AC power signal in an isolated manner.

Technical solution

The utility model provides a power supply sine wave sampling circuit, which comprises a sampling module, an optocoupler isolation module and a signal output module, wherein the sampling module is connected between an alternating current power source and an input end of the optocoupler isolation module, the optocoupler The output terminal of the isolation module is connected to the signal output module that outputs a sine wave.

Further, the sampling module includes a first resistor, a second resistor, and a first diode, a first end of the first resistor is connected to a live line of the alternating current power source, and a second end is connected to the second resistor The second end of the second resistor is connected to the neutral line of the alternating current power source, the anode of the first diode is connected to the second end of the first resistor, and the cathode is used as the output end of the sampling module. Connected to the input end of the optocoupler isolation module.

Further, the optocoupler isolation module includes a photocoupler, a first input end of the optocoupler is connected to an output end of the sampling module, a second input end is grounded, a first output end is connected to a DC power supply, and a second output is The end serves as an output of the optocoupler isolation module.

Further, the signal output module includes a third resistor and a fourth resistor, a first end of the third resistor is connected to an output end of the optocoupler isolation module, and a second end is used as an output end of the signal output module. And grounded through the fourth resistor.

Further, the sampling module further includes a fifth resistor, a first end of the fifth resistor is connected to the cathode of the first diode, and a second end is connected to the first input end of the photocoupler.

In addition, an LED emergency light is provided, including the power sine wave sampling circuit described above.

Beneficial effect

The power sine wave sampling circuit realizes the isolation sampling of the AC and DC signals of the power sampling signal, and the circuit structure is simple and reliable, and the cost is low. And the LED emergency light fixtures designed can meet the fire light standard. GB_17945-2010, can also meet 3C (English name: China Compulsory Certification, English abbreviation: CCC, compulsory product certification system), CE (European Conformity) , European Community standards, to broaden the scope of product applications.

DRAWINGS

1 is a circuit structural diagram of a power sine wave sampling circuit in a preferred embodiment of the present invention;

2(1) and (2) are waveform diagrams of the power supply signal and the sampling signal of the power sine wave sampling circuit shown in FIG. 1, respectively.

Embodiments of the invention

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1 , a power supply sine wave sampling circuit of the preferred embodiment of the present invention includes a sampling module 100 for sampling an electrical signal of an alternating current power source, an optocoupler isolation module 200 for isolating an alternating current signal and a direct current signal, and used as a sampling. The signal output module 300 of the signal output is connected between the AC power source and the input end of the optocoupler isolation module 200. The output end of the optocoupler isolation module 200 is connected to the signal output module 300 that outputs the sine wave.

In this embodiment, the sampling module 100 includes a first resistor R1, a second resistor R2, and a first diode D1. The first end of the first resistor R1 is connected to the live line L of the AC power source, and the second end of the first resistor R1 is connected. The first end of the second resistor R2, the second end of the second resistor R2 is connected to the neutral line N of the alternating current power source, the anode of the first diode D1 is connected to the second end of the first resistor R1, and the first diode D1 The cathode serves as an output of the sampling module 100 to the input of the optocoupler isolation module 200.

In this embodiment, the optocoupler isolation module 200 includes a photocoupler U1. The first input terminal A of the photocoupler U1 is connected to the output end of the sampling module 100, that is, the cathode of the first diode D1, and the photocoupler U1. The second input terminal B is grounded, the first output terminal C of the photocoupler U1 receives the DC power supply vcc, and the second output terminal D of the photocoupler U1 serves as the output terminal of the optocoupler isolation module 200 to the signal output module 300. Further, the sampling module 100 further includes a fifth resistor R5. The first end of the fifth resistor R5 is connected to the cathode of the first diode D1. At this time, the second end of the fifth resistor R5 serves as an output end of the sampling module 100. Connected to the first input terminal A of the photocoupler U1.

In this embodiment, the signal output module 300 includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 is connected to the output end of the optocoupler isolation module 200, that is, the second output terminal D of the photocoupler U1. The second end of the third resistor R3 serves as the output terminal 301 of the signal output module 300 and is grounded through the fourth resistor R4. It can be understood that the resistors in the above embodiments can be replaced in series and in parallel using a plurality of resistors.

The working principle of the power sine wave sampling circuit will be described with reference to FIG. 1 and FIG. 2:

The AC power line L and the neutral line N line are energized, and the AC line is powered by the positive half line of the live line L (refer to the waveform (1) in Fig. 2 from 0 to t/2 or t to 3t/2), and the voltage is passed through the first resistor R1. A diode D21 and a fifth resistor R5 are connected to the first input terminal A of the photocoupler U1 due to The photocoupler U1 is a linear device. This positive half-cycle voltage forms a positive half-cycle sinusoidal current on the photocoupler U1. This current is internally coupled to the secondary via the photocoupler U1 and converted into a secondary positive half-cycle sinusoidal voltage signal. It is output via the third resistor R3 (refer to 0 to t/2 or t to 3t/2 of the waveform (2) in Fig. 2).

When the alternating current is negative for half a cycle, the alternating current positive half cycle zero line N is powered up (refer to the time t/2 to t or 3t/2 to 2t of the waveform (1) in FIG. 2), and the alternating voltage is passed through the neutral line N and the second resistor R. The first diode D21 and the fifth resistor R5 are connected to the first input terminal A of the photocoupler U1, and the other half of the sinusoidal current signal of the sampled output signal is formed on the photocoupler U1 (refer to the waveform (2) in FIG. 2 From t/2 to t or 3t/2 to 2t), the third resistor R3 is output, and the other half of the sine wave voltage signal is formed at the secondary, thus completing the sampling of the sine wave signal.

In addition, an LED emergency light includes the above-described power sine wave sampling circuit.

The power sine wave sampling circuit realizes the isolation sampling of the AC and DC signals of the sampling signal, and the circuit structure is simple and reliable, and the cost is low. And the LED emergency light fixtures designed can meet the fire light standard. GB_17945-2010, can also meet the 3C, CE standards, so that the product application range is broadened.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included. Within the scope of protection of the present invention.

Claims

A power supply sine wave sampling circuit, comprising: a sampling module, an optocoupler isolation module, and a signal output module, wherein the sampling module is connected between an AC power source and an input end of the optocoupler isolation module, the optocoupler The output terminal of the isolation module is connected to the signal output module that outputs a sine wave.
The power sine wave sampling circuit according to claim 1, wherein the sampling module comprises a first resistor, a second resistor and a first diode, and the first end of the first resistor is connected to the AC power source. a second end of the second resistor, the second end of the second resistor is connected to the neutral line of the alternating current power source, and the anode of the first diode is connected to the first resistor The second end of the cathode is connected to the input end of the optocoupler isolation module as an output end of the sampling module.
The power supply sine wave sampling circuit according to claim 1 or 2, wherein the optocoupler isolation module comprises a photocoupler, and a first input end of the photocoupler is connected to an output end of the sampling module, The two input terminals are grounded, the first output terminal is connected to the DC power source, and the second output terminal is used as the output end of the optocoupler isolation module.
The power supply sine wave sampling circuit according to claim 1 or 2, wherein the signal output module comprises a third resistor and a fourth resistor, and the first end of the third resistor is connected to the optocoupler isolation module And an output end, the second end serves as an output end of the signal output module, and is grounded through the fourth resistor.
The power supply sine wave sampling circuit according to claim 3, wherein the sampling module further comprises a fifth resistor, the first end of the fifth resistor is connected to the cathode of the first diode, and the second end Connected to the first input of the optocoupler.
An LED emergency light characterized by comprising the power sine wave sampling circuit according to any one of claims 1 to 5.