CN201054851Y - Discharge lamp tube stabilizer suitable for solar power supply - Google Patents

Abstract

The utility model relates to a discharge lamp tube stabilizer suitable for a solar power supply, which comprises a switching power supply circuit, a high-voltage igniter and a detection protection circuit; the switching power supply circuit is used for converting the electric power output by the solar battery into a stable direct-current power supply and sending the stable direct-current power supply to the high-voltage igniter to light the discharge lamp tube; the detection protection circuit detects the output current of the switching power supply circuit to the high-voltage igniter at any time, and can close the switching power supply circuit when the switching power supply circuit is overloaded; the solar battery power supply outputs a power supply with constant power after being converted by the switching power supply circuit, so that the stable brightness of the discharge lamp tube is ensured; and when the discharge lamp tube is in failure or overheated, the ballast for driving the discharge lamp tube to light is closed, so as to avoid the damage of long-term high-voltage output to peripheral components.

Description

Discharge lamp ballast suitable for solar power

technical field

The utility model relates to a stabilizer for a discharge lamp tube, in particular to a stabilizer for a discharge lamp tube which is applicable to a solar power source and overcomes the problem of unstable voltage.

Background technique

According to the high-pressure gas discharge (HID) lamp, the brightness is three times that of the traditional halogen lamp, and the power consumption is only 50% of the traditional halogen lamp. Another advantage of the HID lamp compared with the traditional halogen lamp is that the service life is shorter. Significantly extended, because the service life of HID lamps is almost 10 times that of traditional halogen lamps. Therefore, in addition to being widely used in car lights, it is also used in large-area areas that require high-quality lighting, or for occasions with special requirements such as energy efficiency and light source density. Such as stadiums, roads, parking lots or laneways, indoor cultivation fields, etc.

And the HID lamp mainly uses the principle of high-voltage discharge to increase the voltage to more than 23,000 volts, generates an arc in the lamp tube and burns xenon to emit light. Due to these characteristics, HID lamps generally must be driven by high-tech precision ballasts, and therefore have high requirements for the stability of the power supply. However, in today's energy shortage, the use of solar energy to convert electricity is regarded as an economical and environmentally friendly alternative energy source. However, the power supplied by solar cells is not stable. Generally, HID lamps are lit by AC11V/220V power supply of the mains. It cannot be directly supplied by the 12V DC power supply of the solar cell. In addition, ordinary HID lamps are very prone to flickering. When the starting current is too high or the temperature of the lamp is too high, the service life of the HID lamp will be shortened; No, they will continue to output, so in the state of HID lamp failure or short circuit, the continuous output of the ballast will cause damage to peripheral components.

Contents of the invention

It can be seen from the above that although solar cells are an ideal alternative energy source for environmental protection and economy, as a power source for HID lamps, if they are not properly treated, the effect will not only be unsatisfactory, but will also affect the service life and damage peripheral components. Further review is needed. , and seek feasible solutions.

Therefore, the main purpose of this utility model is to provide a discharge lamp stabilizer suitable for solar power supply, which can output a stable power voltage to the lamp, and automatically detect whether the lamp is faulty or overheated, so as to ensure that the peripheral components are not damaged , effectively solve various problems of solar cells used in driving HID lamps.

The main technical means taken for reaching the aforementioned purpose is to make the aforementioned stabilizer include:

A switching power supply circuit, the input end of which is connected to a solar cell, so as to convert the output power of the solar cell into a stable DC power supply;

A high-voltage igniter is installed at the output end of the switching power supply circuit to obtain a stable power voltage and convert it to a specific high voltage to light the HID lamp;

A detection and protection circuit is connected with the switching power supply circuit to detect the output current of the switching power supply circuit in real time, judge whether it is overloaded, and detect whether the HID lamp tube is faulty or overheated;

In the above circuit design, the output power of the solar battery power supply is constant after being converted by the switching power supply circuit, which can ensure the brightness of the discharge lamp is stable; if the HID lamp fails or overheats, the switching power supply is turned off. circuit and high-voltage igniter to avoid damage to peripheral components caused by long-term high-voltage output.

The aforementioned switching power supply circuit is at least composed of an input circuit, a transformer, an output circuit, a power transistor and a pulse width modulation controller; wherein: the input circuit and the output circuit are respectively connected to the primary side and the secondary side of the transformer side, the pulse width modulation controller controls whether the input circuit is connected to the primary side of the transformer through the power transistor.

The aforementioned detection and protection circuit includes:

A first detection unit, whose input terminal obtains its output current from the output circuit of the switching power supply circuit, compares it with a set reference value, and provides a signal to the switching power supply circuit according to the comparison result;

A second detection unit, whose input terminal obtains its output voltage from the output circuit of the switching power supply circuit, and compares it with a set reference value to judge whether the HID lamp is abnormal (empty connection or fault), And provide a signal to the switching power supply circuit according to the comparison result.

The aforementioned first detection unit is made up of a comparator and an optical isolator, an input end of the comparator is connected with the output end of the switching power supply circuit, and its output end is connected with the input end of the optical isolator, and the optical isolation The output of the converter is a pulse width modulation controller connected to the switching power supply circuit.

The aforementioned second detection unit is composed of a voltage divider circuit, a zener diode, an optical isolator and a silicon controlled rectifier. One end of the voltage divider circuit is connected to the output end of the switching power supply circuit, and its voltage divider node is The input end of the optical isolator is connected through the Zener diode, and the output end of the optical isolator is connected to the pulse width modulation controller of the switching power supply circuit through the silicon controlled rectifier.

Can understand that the utility model has the following advantages at least by above-mentioned circuit design:

1. Because the utility model makes the solar battery power supply a power supply with constant output power after being converted by the switching power supply circuit, it can ensure the stable brightness of the discharge lamp tube.

2. In this utility model, the detection and protection circuit detects the output current output from the switching power supply circuit to the high-voltage igniter at any time, and the switching power supply circuit can be turned off when overloaded, so as to provide overcurrent protection and prolong the service life of the HID lamp tube .

3. Due to the failure or overheating of the discharge lamp in the utility model, the ballast that drives the discharge lamp to light will be turned off to avoid damage to peripheral components caused by long-term high-voltage output.

Description of drawings

Fig. 1: is the detailed circuit diagram of the present utility model.

Detailed ways

For a detailed circuit diagram of a preferred embodiment of the present utility model, please refer to shown in Figure 1, which includes three parts such as a switching power supply circuit 10, a high-voltage igniter 20 and a detection and protection circuit 30; wherein:

The switching power supply circuit 10 is at least composed of an input circuit 11, a transformer 12, an output circuit 13, a power transistor 14 and a pulse width modulation controller 15; wherein: the input end of the input circuit 11 is connected to a The connection of the solar cell is not shown in the figure, and the input circuit 11 and the output circuit 13 are respectively connected to the primary side and the secondary side of the transformer 12. The pulse width modulation controller 15 controls the power transistor 14 with a pulse with adjustable pulse width. The conduction time of the input circuit 11 is used to control whether the input circuit 11 is connected to the primary side of the transformer 12 and the conduction time, so that a stable output voltage can be induced on the output circuit 13 .

The high-voltage igniter 20 is used to convert the voltage output by the switching power supply circuit 10 into a specific high voltage such as 23,000 volts to drive the HID lamp. The high-voltage igniter 20 mainly uses two sets of drivers 2122 to drive four sets of field Effect transistors Q9-Q12 to switch to generate high voltage. Since the foregoing switching power supply 10 and the high-voltage igniter 20 are known devices, their working principles are not further described in detail.

The detection and protection circuit 30 includes at least:

A first detection unit 31 is made up of a comparator 311 and an optical isolator 312. An input end of the comparator 311 is connected with the negative output end of the output circuit 13 in the switching power supply circuit 10, and its output end is It is connected to the input end of the optical isolator 312 , and the output end of the optical isolator 312 is connected to the pulse width modulation controller 15 of the switching power supply circuit 10 . In this way, it can be detected whether the output current of the switching power supply circuit 10 is higher than a set value, and if so, the optical isolator 312 sends a signal to the PWM controller 15 .

A second detection unit 32 is composed of a voltage dividing circuit 321, a Zener diode 322, an optical isolator 323 and a silicon controlled rectifier 324. The voltage dividing circuit 312 is composed of voltage dividing resistors R38 and R43. One end of the piezoresistor R38 is connected to the positive output end of the output circuit 13, the voltage dividing nodes of the voltage dividing resistors R38 and R43 are connected to the input end of the optical isolator 323 through the Zener diode 322, and the output end of the optical isolator 323 is It is connected to the PWM controller 15 of the switching power supply circuit 10 through the silicon controlled rectifier 324 . That is, when the output voltage of the switching power supply circuit 10 is higher than the voltage value set by the voltage divider circuit 321 and the Zener diode 322, the opto-isolator 323 sends a signal to Pulse Width Modulation Controller 15.

As can be seen from the above, the detection and protection circuit 30 uses the first detection unit 31 to obtain its output current from the output circuit 13 of the switching power supply circuit 10, and compares it with a set reference value. When the output current is greater than the set value, the first detection unit 31 will send a signal to the switching power supply circuit 10 to shut it down.

And the second detection unit 32 will use the output voltage of the detection switching power supply circuit 10 to judge whether the HID lamp tube is abnormally empty or faulty. Once the aforementioned abnormal situation occurs, it will send a signal to the pulse width modulation controller 15 to Turn off the switching power supply circuit 10 .

Claims (4)

1. A discharge lamp stabilizer suitable for solar power supply, characterized in that: comprising: A switching power supply circuit, the input end of which is connected to a solar cell, so as to convert the output power of the solar cell into a stable DC power supply; A high-voltage igniter is installed at the output end of the switching power supply circuit to obtain a stable power voltage and convert it to a specific high voltage to light the HID lamp; A detection and protection circuit is connected with the switching power supply circuit for real-time detection of the output current of the switching power supply circuit to determine whether it is overloaded, and to detect whether the HID lamp is faulty or overheated. 2. As described in item 1 of the scope of patent application, the discharge lamp ballast suitable for solar power supply is characterized in that: the switching power supply circuit is at least composed of an input circuit, a transformer, an output circuit, a power transistor and a pulse Width modulation controller, wherein: the input circuit and output circuit are respectively connected to the primary side and secondary side of the transformer, and the pulse width modulation controller controls whether the input circuit is connected to the primary side of the transformer through a power transistor. 3. As described in item 2 of the patent application scope, the discharge lamp ballast suitable for solar power supply is characterized in that: the detection and protection circuit includes: A first detection unit, whose input terminal obtains its output current from the output circuit of the switching power supply circuit, compares it with a set reference value, and provides a signal to the switching power supply circuit according to the comparison result; A second detection unit, whose input terminal obtains its output voltage from the output circuit of the switching power supply circuit, and compares it with a set reference value to judge whether the HID lamp is abnormal, and provides a The signal is given to the switching power supply circuit. 4. As described in item 3 of the scope of patent application, the discharge lamp ballast suitable for solar power supply is characterized in that: the first detection unit is composed of a comparator and an optical isolator, and an input terminal of the comparator is connected to The negative output terminal of the switching power supply circuit is connected, and its output terminal is connected with the input terminal of the optoisolator, and the output terminal of the optoisolator is connected to the pulse width modulation controller of the switching power supply circuit; The second detection unit is composed of a voltage divider circuit, a zener diode, an optical isolator and a silicon controlled rectifier. One end of the voltage divider circuit is connected to the output end of the switching power supply circuit, and the voltage divider node is The input end of the optical isolator is connected through the Zener diode, and the output end of the optical isolator is connected to the pulse width modulation controller of the switching power supply circuit through the silicon controlled rectifier.

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