JPH09322527A - Boosting chopper device, power supply device, discharge lamp lighting device, and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve output voltage leading characteristics and to reduce power loss due to a starting means. SOLUTION: A boosting chopper device has a main circuit 3 that includes a boosting inductor and a switching means in series and a smoothing means 4 that is connected between both terminals of a switching means 3b, and switches the switching means 3b by a control means 5. In this case, a starting means 6 is used to activate forcibly, power is supplied from a feedback power supply 7 that is electromagnetically coupled to a boosting reactor 30 to a control power supply after starting, and at the same time the starting means 6 is stopped by an operation stopping means. Since the starting means that is not related to the control means 6 is used to activate forcibly on starting, a voltage is activated sharply. On the other hand, since the operation of the starting means 6 is stopped by an operation stop means 8 after the activation, power loss due to the starting means 6 can be reduced.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a step-up chopper device,
The present invention relates to a power supply device, a discharge lamp lighting device, and a lighting device including the same.

[0002]

2. Description of the Related Art A step-up chopper device is a device in which a step-up inductor and a switching means are connected in series to a DC power source, and a DC voltage is chopped by a control means of the switching means. The electric energy appears as a boosted voltage at the moment when the switching means is turned off, and is superimposed on the power supply voltage to appear at the output end, whereby a boosted voltage is obtained.

FIG. 6 is a circuit diagram of a conventional boost chopper device.

In the figure, 61 is an AC power supply, 62 is a rectification power supply, 63 is a boost inductor, 64 is a switching means, 65 is a diode, 66 is a smoothing capacitor, and 67.
Is a control means, 68 is a power supply for activation, and 69 is a feedback power supply.

The starting power source 68 is formed by connecting a series circuit of a resistor 68a and an electrolytic capacitor 68b to the rectifying power source 62, and connecting the connection point of the resistor 68a and the electrolytic capacitor 68b to the input end of the control means 67. The feedback power supply 69 includes a secondary winding 69a of the booster reactor 63 and a diode 69b, and is connected to the input end of the control means 67 in parallel with the power supply 68 for starting.

In this way, the control means 67 first obtains power from the starting power source 68 and starts up, controls the switching means 64 to start the operation of the step-up chopper device, that is, the step-up chopper device starts up. When the boost chopper device is activated, a voltage appears across the secondary winding 69a of the feedback power supply 69 electromagnetically coupled to the boost inductor 63. Since this feedback power supply 69 can supply a larger amount of current than the power supply 68 for start-up, the control means 6 will be used thereafter.
7 is operated mainly by the power supply from the feedback power supply 69.

By the way, the boost chopper device is excellent in compensation for fluctuations in power supply voltage. Therefore, the operating voltage range is wide, and for example, the AC power supply can be adapted to both 100V and 200V.

[0008]

However, in the conventional step-up chopper device, since the starting power source 68 is always connected to the rectified power source 62, a current always flows through the resistor 68a. Therefore, the power loss is large. Further, in order to operate the control means without fail immediately after starting, the electrolytic capacitor 68
It is necessary to set the capacity of b to some extent large. On the other hand, in order to reduce the power loss in the resistor 68a as much as possible, the time constant of the starting power source 68 is inevitably large because the resistance value of the resistor 68a is large, that is, the rising of the input voltage of the control means. Is slow.

FIG. 7 is a graph showing a voltage rising characteristic at the time of starting of the conventional boost chopper device.

In the figure, the horizontal axis represents time and the vertical axis represents the input voltage of the control means. Time 0 indicates when the power is turned on and time t1 indicates when the operation of the control means 67 is started. That is, when the terminal voltage of the electrolytic capacitor 68b of the starting power supply 68 rises to the voltage V1, the control means 67 starts the operation and the switching means 64 starts switching, but the feedback power supply 69 is delayed with a slight delay.
Is started, the input voltage supplied to the control means 69 further rises (V2), and the control means 69 eventually reaches a stable operation. In the conventional technique, the time t1 is long as described above. When the AC power supply 51 is 200V,
Although the startup time is relatively short, the power loss due to the resistor 68a is large. On the contrary, in the case of 100V, the power loss is relatively small, but the startup time is long. For example, AC power supply 61 is a commercial power supply of 20V for negotiation, and resistor 68a is 4
4KΩ, electrolytic capacitor 68b 220μF, voltage V1
Is 10 V, the time required to reach the voltage of 10 V was about 700 mS. Also, the resistor 68 at this time
The power loss in a was 0.57W.

It is an object of the present invention to provide a step-up chopper device in which the voltage rising characteristic of the control means is good and the power loss in the starting means is small, a power supply device using the same, a discharge lamp lighting device and a lighting device. To do.

[0012]

According to another aspect of the present invention, there is provided a step-up chopper device comprising: a direct current power source; a main circuit including a series circuit of a step-up inductor and a switching means and fed from the direct current power source; Smoothing means for smoothing the appearing voltage and feeding the load; control means for the switching means; starting means for forcibly starting the switching means by being fed from the DC power supply; control means electromagnetically coupled to the boosting inductor A feedback power supply for supplying power to the control means; and an operation stopping means for stopping the operation of the starting means after the operation of the control means is stabilized.

In the present invention and the following inventions, the DC power supply may be any DC power supply such as a rectified power supply and a battery power supply, unless otherwise specified. In the case of a rectified power supply, it may be a smoothed power supply, a non-smoothed power supply or a semi-smoothed power supply.

The switching means is preferably a transistor such as a FET, but is not limited to this.

The chopping frequency is preferably several tens KHz, for example 40 KHz, but is not limited to this.

Thus, in the present invention, when the boost chopper device is activated by the activation means, a voltage is immediately induced in the feedback power supply electromagnetically coupled to the boost inductor. Since it is extremely easy to set the current of the feedback power supply to be larger than the current of the starting means, the control means is driven by the voltage generated in the feedback power supply, and the switching means continues to operate.

Further, since the starting means only needs to supply a small signal for starting the switching means, the starting means can be constructed by using a resistor having a considerably high resistance value and a capacitor having a small capacitance, and therefore the starting means. The time constant of the means can be reduced, and the voltage rise of the control means can be accelerated.

On the other hand, the start-up means has its output terminal potential lowered by the operation stopping means which operates in conjunction with the switching means, so that the operation applied to the step-up chopper device is substantially stopped.

According to a second aspect of the invention, there is provided the boost chopper device according to the first aspect, wherein the starting means is
It is characterized by including a series circuit of a resistor and a capacitor connected between DC power supplies and a trigger circuit connected between a connection point of the resistor and the capacitor and a control terminal of the switching means.

In the present invention, the capacitor of the starting means may have a smaller capacity than that of the prior art,
The current flowing through the resistor in series with this is small, so the power loss is negligible.

A known trigger circuit can be used as the trigger circuit, and any trigger element can be used.

According to a third aspect of the invention, there is provided the step-up chopper device according to the second aspect, wherein the operation stopping means reduces the potential at the output end of the starting means in conjunction with the operation of the switching means. It is characterized by being.

In the present invention, it is easy to stop the operation of the starting means after the stable operation of the control means. Since the switching means of the boost chopper device is used as the switching means, it is not necessary to use a dedicated switching means for stopping the operation.

The boosting chopper device according to a fourth aspect of the present invention is the boosting chopper device according to the third aspect, wherein the operation stopping means is connected between the switching means and the starting means and acts so as to extract the electric charge of the capacitor of the starting means. It is characterized in that it consists of a diode.

According to the present invention, since the operation stopping means is composed of the diode, the cost increase can be suppressed.

According to a fifth aspect of the present invention, there is provided a power supply device including the step-up chopper device according to the first or second aspect; and an inverter including switching means and connected to an output terminal of the step-up chopper device. I am trying.

According to a sixth aspect of the present invention, there is provided a power supply device including the step-up chopper device according to the third or fourth aspect; and an inverter including switching means and connected to an output terminal of the step-up chopper device. I am trying.

In the fifth and sixth aspects of the invention, the inverter may be any type. The load of the boost chopper device is an inverter, and the output of the inverter operates the final load. The final load may be operated at high frequency or rectified and operated at DC.

According to a seventh aspect of the power source device of the present invention, in the power source device according to the fifth aspect, the operation stopping means lowers the potential of the output end of the starting means in conjunction with the operation of the switching means of the inverter. It is characterized by being.

In the present invention, since the switching means of the inverter is used to stop the operation, it is not necessary to use a dedicated switching means.

According to an eighth aspect of the present invention, in the power source apparatus according to the seventh aspect, the operation stopping means is connected between the switching means and the starting means of the inverter and acts so as to extract the electric charge of the capacitor of the starting means. It is characterized in that it consists of a diode.

According to the present invention, the operation stopping means can be constituted by the diode, and the cost increase can be suppressed.

A discharge lamp lighting device according to a ninth aspect of the present invention comprises the power supply device according to any one of the fifth to eighth aspects; and a discharge lamp that is turned on by the output of the inverter. There is.

In the present invention, any discharge lamp may be used, and for example, a desired one such as a fluorescent lamp or an HID lamp may be used.

An illumination device according to a tenth aspect of the present invention is characterized by comprising: an illumination device main body; and the discharge lamp lighting device according to the eighth aspect provided in the illumination device main body.

The present invention is applicable to various lighting devices such as lighting devices for general lighting, emergency lighting devices, guide lights, and outdoor lighting devices.

[0037]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing a first embodiment of the boost chopper device of the present invention.

In the figure, 1 is an AC power supply, 2 is a DC power supply, 3 is a main circuit, 4 is a smoothing means, 5 is a control means, 6 is a starting means, 7 is a feedback power supply, and 8 is an operation stopping means.

The DC power supply 2 is a rectified DC power supply in this embodiment. The main circuit 3 includes a boost reactor 3a and a switching means 3b connected in series with the boost reactor 3a, and is connected between both ends of the DC power supply 2. Switching means 3b
The switching, that is, chopping, is controlled by the control means 5 except at the time of starting. Switching means 3
A smoothing means 4 composed of a series circuit of a diode 4a and a capacitor 4b is connected between both ends of b.

The control means 5 and the activation means 6 are connected in parallel to the control pole of the switching means 3b. The control means 5 is powered by the feedback power supply 7. The feedback power supply 7 is composed of a secondary winding 7a of the boost reactor 3a, a diode 7b, and a capacitor 7c connected in series, and power is supplied to the control means 5 from both ends of the capacitor 7c.

The starting means 6 is powered by the DC power supply 2.

Next, the circuit operation will be described.

When the AC power supply 1 is turned on, a DC voltage appears at the output end of the rectified DC power supply 2. Then, the output voltage of the starting means 6 rises, the switching means 3b is turned on, and a current flows through the booster reactor 3a.
Electric energy is accumulated in the boost reactor 3a. When the switching means 3b is turned off, the flowing current is cut off, so that the electric energy accumulated in the booster reactor 3a is released and the boosted voltage appears. This boosted voltage is superimposed on the power supply voltage and passes through the diode 4a to charge the capacitor 4b.

When the switching means 3a is turned on, a voltage is also induced across the secondary winding 7a, and the diode 7b
The capacitor 7c is charged via. When the capacitor 7c is charged, power is supplied to the control means 5, so that the control means 5 operates and starts oscillation. As a result, the output of the control means 5 is injected into the control pole of the switching means 3b. Since the output voltage of the control means 5 is higher, the switching means 3b is now controlled by the control means 5 for switching, that is, chopping.

FIG. 2 is a graph showing an input voltage rising characteristic of the control means at the time of starting in the first embodiment of the boost chopper device of the present invention.

In the figure, time t1 'shows the rising of the input voltage at the start of the operation of the control means 5, and after t1' shows the rising by the feedback power supply 7. The switching means 3b is activated by the activation means 6 earlier than t1 '. Comparing time t1 ′ with time t1 in FIG. 6, t1 ′ is significantly shorter than t1. This is because in the present invention, the starting means 6 and the control means 5 are independent of each other, and therefore the time constant of the starting means 5 can be made extremely small. Moreover, according to the present invention, when the power is turned on and the output voltage of the starting means 6 becomes V1, the switching means 3b is switched, and the power is supplied from the feedback power supply 7 to the control means 5 as described above.
Since the switching means 3b is continuously switched in place of the starting means 6, the output voltage of the control means 5 rises quickly, so that the voltage becomes V2 and the time until the stable operation of the control means 5 is shortened.

FIG. 3 is a circuit diagram showing a second embodiment of the boost chopper device of the present invention.

In the figure, the same parts as those in FIG.

The present embodiment is characterized by the structure of the activation means 6. That is, the starting means 6 includes a time constant circuit 6c composed of a series circuit of a resistor 6a and a capacitor 6b connected between the output terminals of the DC power supply 2, an output terminal of the time constant circuit 6c and a control pole of the switching means 3b. And a series circuit of a trigger element 6d and a resistor 6e connected between the two.
The output end of the control means 5 is connected to the control pole of the switching means 3b via the resistor 5a.

In the present embodiment, the time constant circuit 6c may have a small capacitance in the capacitor 6b, and therefore the time constant is small.

Next, the experimental results of this embodiment will be shown.

1. Specifications AC power supply 1: Nominal 120V, 60Hz power supply Resistor 6a: 150KΩ Capacitor 6b: 470pF Control means 5: Motorola IC MC33261
(Operation start voltage 10V) 2. Results Operation start time of control means 5: 200 mS Power loss of resistor 6a: 0.2 W FIG. 4 is a circuit diagram showing an embodiment of the power supply device and the discharge lamp lighting device of the present invention.

In the figure, the same parts as those in FIG.

In this embodiment, an inverter 9 is connected to the output end of the boost chopper device to form a power supply device, and a discharge lamp 10 is connected to the output end of the power supply device to form a discharge lamp lighting device. .

The inverter 9 includes a pair of switching means 9a and 9b connected in series and a switching means 9b.
Reactor 9c and capacitor 9 connected between both ends of
It is a half-bridge inverter including a series circuit of d. However, the present invention allows for other inverters.

The discharge lamp lighting device comprises a step-up chopper device, an inverter 9 and a series circuit of a discharge lamp 10 and a capacitor 11 connected between the output terminals of the inverter 9, that is, both ends of the capacitor 9d.

FIG. 5 is a front view showing an embodiment of the illumination device of the present invention.

In the figure, 12 is a main body of the illuminating device, 13,
13 is a socket, 14 is a discharge lamp lighting device, and 10 is a discharge lamp.

[0060]

According to the first to fourth aspects of the present invention, it is possible to provide the boost chopper device in which the input voltage rising characteristic of the control means is good and the power loss in the starting means is small.

According to the second aspect of the invention, it is possible to provide the boost chopper device in which the circuit configuration of the starting means is simple.

According to the third aspect of the invention, it is possible to provide a boost chopper device in which the operation of the starting means can be easily stopped after the stable operation.

According to the fourth aspect of the present invention, it is possible to provide an inexpensive step-up chopper device in which the circuit configuration of the operation stopping means is simple.

According to the invention of claims 5 to 7, it is possible to provide a power supply device having the effects of claims 1 to 4.

According to the invention of claim 6, in addition, it is possible to provide a power supply device which stops the operation of the starting means by utilizing the operation of the switching means of the inverter.

According to the invention of claim 7, it is possible to provide a power supply device having a simple circuit configuration of the operation stopping means.

According to the invention of claim 8, it is possible to provide a discharge lamp lighting device having the effects of claims 5 to 7.

According to the invention of claim 9, it is possible to provide an illumination device having the effect of claim 8.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of a boost chopper device of the present invention.

FIG. 2 is a graph showing an input voltage rising characteristic of the control means at the time of starting in the first embodiment of the boost chopper device of the present invention.

FIG. 3 is a circuit diagram showing a second embodiment of the boost chopper device of the present invention.

FIG. 4 is a circuit diagram showing an embodiment of a power supply device and a discharge lamp lighting device of the present invention.

FIG. 5 is a front view showing an embodiment of the lighting device of the present invention.

FIG. 6 is a circuit diagram of a conventional boost chopper device.

FIG. 7 is a graph showing an input voltage rising characteristic of the control means of the conventional boost chopper device.

[Explanation of symbols]

 2 ... DC power supply 3 ... Main circuit 3a ... Boosting reactor 3b ... Switching means 4 ... Smoothing means 5 ... Control means 6 ... Starting means 7 ... Feedback power supply 8 ... Operation stopping means

Claims (10)

[Claims] 1. A DC power supply; a main circuit including a series circuit of a boosting inductor and a switching means and fed from a DC power supply; smoothing means for smoothing a voltage appearing across the switching means and feeding the load. Control means for the switching means; starter means for forcing the switching means to be powered by a DC power supply; feedback power supply electromagnetically coupled to the boosting inductor for supplying power to the control means; A step-up chopper device comprising: an operation stopping means for stopping an operation. 2. The starting means includes a series circuit of a resistor and a capacitor connected between DC power supplies, and a trigger circuit connected between a connection point of the resistor and the capacitor and a control terminal of the switching means. The booster chopper device according to claim 1, wherein the booster chopper device is provided. 3. The operation stopping means is configured to lower the potential of the capacitor of the starting means in conjunction with the operation of the switching means.
The boost chopper device described. 4. The step-up chopper device according to claim 3, wherein the operation stopping means comprises a diode which is connected between the switching means and the starting means and acts so as to extract the electric charge of the capacitor of the starting means. 5. A power supply device comprising: the boost chopper device according to claim 1; and an inverter including switching means and connected to an output end of the boost chopper device. 6. A power supply device comprising: the step-up chopper device according to claim 3; and an inverter including switching means and connected to an output end of the step-up chopper device. 7. The operation stopping means is configured to lower the potential of the output end of the starting means in conjunction with the operation of the switching means of the inverter.
The power supply as described. 8. The power supply device according to claim 7, wherein the operation stopping means comprises a diode which is connected between the switching means and the starting means of the inverter and acts so as to extract the electric charge of the capacitor of the starting means. 9. A power supply device according to any one of claims 5 to 8; a discharge lamp that is turned on by the output of an inverter;
A discharge lamp lighting device comprising: 10. A lighting device comprising: a lighting device main body; and the discharge lamp lighting device according to claim 9 disposed in the lighting device main body.