KR20160074960A - Constant voltage supply circuit with thyristor and electric device with the same - Google Patents

Abstract

The present invention relates to a constant voltage circuit with a thyristor and an electric device with the same. The constant voltage circuit suggested in the present invention comprises a first switch element which comprises a triac or thyristor between a charging capacitor and a power source, and a second switch element formed between the first switch element and the charging capacitor. The second switch element is shorted when the charging capacitor is charged to a desired voltage. So, the charging voltage of the charging capacitor can be accurately controlled.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant voltage circuit using a thyristor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant voltage circuit using a thyristor and an electric device having the same, and more particularly, to a constant voltage circuit using a thyristor for charging a charging capacitor with a set voltage value and an electric device having the constant voltage circuit.

The constant voltage circuit is a circuit that receives a commercial power supply, rectifies it, converts it into a DC voltage, and supplies it. Such a constant voltage circuit is used not only for a digital device requiring a constant voltage but also for an electric device consuming a lot of electric energy at once after storing energy supplied from a commercial power source.

The constant voltage circuit is implemented with various kinds of rectifier circuits. The rectifier circuit can be roughly divided into two types, one being capable of arbitrarily adjusting the output voltage level and the other being unable to control the output voltage level. A typical example of controlling the output voltage level is the Switching Mode Power Supply. Switching mode power supplies allow accurate output voltage control, but are expensive. A typical circuit example that can not control the output voltage level is a half wave voltage rectifier circuit and a wave voltage rectifier circuit that output a fixed output voltage according to the input voltage.

On the other hand, a thyristor is widely known as an alternating current rectifying device, and a device that adjusts the brightness of a lamp through a phase control method is mainly used. The present inventors have proposed a technique for constructing a constant voltage circuit using a thyristor as disclosed in Patent Document 1, unlike a usual method of using a thyristor for phase control. However, the circuit disclosed in Patent Document 1 has a problem that the reference voltage value set by the user can not be accurately output and is charged higher than the reference voltage value.

1 is a voltage waveform diagram for explaining a circuit diagram of Patent Document 1 and a voltage state charged in a charge capacitor. 1 (a), the constant voltage circuit 100 shown in the patent document 1 has a thyristor (hereinafter referred to as "SCR") between a time-varying voltage input unit 10 and a charge capacitor C ₀ , ). A reference voltage portion 20 for setting a voltage level charged in the charging capacitor C ₀ is connected to the gate terminal g of the SCR. A negative terminal (30) is connected to both ends of the charge capacitor (C ₀ ) to supply power. 1 (a), the initial voltage of the charging capacitor C ₀ is 0 V, the reference voltage value set in the reference voltage unit 20 is 130 V, and the 220 V AC power source The operation of the circuit will be described on the assumption that it is supplied. 1 (b), when the AC power source having a peak value of 310 V is applied, the SCR is applied to the anode terminal (a) voltage Va, the cathode terminal (c) voltage Vc and the gate terminal (g) Vg) is switched from an off state to an on state when the relation of Equation (1) is satisfied, and is switched from an on state to an off state when the relation of Equation (2) is satisfied. That is, the SCR has a characteristic in that the gate terminal voltage Vg becomes smaller than the cathode terminal voltage Vc in the ON state and is not turned off.

Figure 1 (b) is a cigar sides will showing a voltage waveform supplied from the voltage input section 10, a solid line period during the charge to the charge capacitor (C ₀₎ is in the SCR on state in the market side voltage input section 10 is stored During the dashed line period, the SCR turns off, indicating that no charge flows from the time-varying voltage input unit 10 to the charge capacitor C ₀ . Figure 1 (c) shows the charging voltage of the charging capacitor (C ₀₎ changes with time. When a voltage is applied at the time-varying voltage input unit 10, SCR is turned on and electric charge starts to accumulate in the charge capacitor C ₀ . Then, when the voltage supplied from the time-variant voltage input unit 10 begins to fall from the upper peak value, the SCR is turned off at time ta when the voltage becomes lower than the charging voltage of the charging capacitor C ₀ , and charging is stopped. It is assumed that the voltage charged in the charging capacitor C _{0 at} time ta is 80V. Since cigars voltage is greater than 80V moment to be applied in variable voltage input (10) (tb visual) SCR while being switched back to the on-state voltage charged in the beginning of the charging, and begins to drop at the upper peak value charging capacitor (C ₀₎ The SCR is turned off at time tc, and the charging is stopped. It is assumed that the voltage charged in the charging capacitor C ₀ becomes 150 V at time tc. However, it can be seen that the reference voltage Vref applied to the SCR gate terminal g is 130 V, and that 150 V is charged in the charge capacitor C ₀ . That is, it can be seen that the user is charged to a voltage higher than the voltage value (reference voltage value) for charging the charge capacitor C ₀ . This phenomenon occurs because the OFF condition of the SCR is not controlled by the SCR gate terminal (Vg) as shown in Equation (2).

On the other hand, a constant voltage circuit is used to brighten the xenon lamp even in the IPEl device. The eyeliner is a device that treats light of various wavelengths at once and treats skin with various diseases easily. It is developed by Dr. Bitter in USA and is widely used now. The IPE device uses a lamp flash that emits a wavelength light of 350nm to 1200nm and controls the wavelength of light emitted by the filter. As the irradiation lamp, usually a zenon lamp is used for 2 to 3 seconds for 3 seconds The skin is irradiated about once. In this case, the amount of xenon lamp irradiated is differently adjusted depending on the skin color of the user and the condition of the skin. Since such an eyepiece device is used for therapeutic purposes, it is necessary to precisely control the amount of light.

However, in the conventional technique disclosed in Patent Document 1, the charging capacitor (C ₀ ) voltage can not be accurately controlled as desired by the user, and thus it is difficult to use the charging capacitor (C ₀ ) in an electric appliance requiring precise voltage control.

Patent Document 1: Korean Patent No. 10-1089106 (issued on December 16, 2011)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of controlling a charging voltage of a charging capacitor (C ₀ ) capable of controlling a voltage level, And to provide a constant voltage circuit using the thyristor and an electric apparatus having the same.

The above object of the present invention is achieved by a constant voltage circuit capable of regulating an output voltage level and providing a constant voltage function, comprising: a time varying voltage input unit for providing a time varying voltage; a charge capacitor for accumulating charge; A thyristor and a switch element provided between the charge capacitors and a reference voltage part connected to a gate terminal of the thyristor and setting a charge voltage of the charge capacitor, the switch element having a gate terminal of the thyristor, a cathode terminal of the thyristor, And is connected to one end of the charge capacitor.

The above object of the present invention is achieved by a constant voltage circuit capable of regulating an output voltage level and providing a constant voltage function, comprising: a time varying voltage input unit for providing a time varying voltage; a charge capacitor for accumulating charge; And a reference voltage portion connected to the gate terminal of the triac and setting a charging voltage of the charging capacitor, wherein the switching element is connected to the gate terminal of the triac, the second terminal of the triac, Terminal and the charging capacitor, and the constant-voltage circuit is characterized in that it is connected to one terminal of the charging capacitor.

Another object of the present invention can also be attained by an electric device having a constant voltage circuit according to the present invention, and one of the most suitable electric devices is an IPE device.

The constant voltage circuit using the thyristor according to the present invention and the electric device having the same can be constituted by SCR and one switching element connected between the gate terminal and the cathode terminal of the SCR. Therefore, the constant voltage circuit using the thyristor according to the present invention can constitute a circuit element requiring a low cost, and can accurately control the charging voltage of the charging capacitor C ₀ that can provide the constant voltage and adjust the output voltage level .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a voltage waveform diagram for explaining a circuit diagram of Patent Document 1 and a voltage state charged in a charging capacitor; FIG.
FIG. 2 is a voltage waveform diagram for explaining a constant voltage circuit diagram using a thyristor according to an embodiment of the present invention and a voltage state charged in a charge capacitor. FIG.
Fig. 3 and Fig. 4 also show an embodiment of the open circuit voltage input unit constituting the constant voltage circuit of the present invention.
Fig. 5 is a circuit block diagram of an IPE device using the constant voltage circuit according to the present invention. Fig.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It is to be understood that the present invention is not intended to be limited to the specific embodiments but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

The present invention is directed to a constant voltage circuit capable of regulating an output voltage level while providing a constant voltage function. The constant voltage function means a function of constantly outputting the output value without changing the output voltage level desired by the user even if the inputted voltage value fluctuates.

FIG. 2 is a voltage waveform diagram for explaining a constant voltage circuit diagram using a thyristor according to an embodiment of the present invention and a voltage state charged in a charge capacitor. FIG. The constant voltage circuit 100 is composed of a time varying voltage input section 10, an SCR, a switch element 50, a reference voltage section 20 and a charge capacitor C ₀ . The power source uses a time varying voltage input unit 10 that outputs a voltage varying with time. The SCR, the switch device 50 and the switch device 50 are provided between the charge capacitors C ₀ , The terminal g is connected to a reference voltage portion 20 for setting a voltage level charged in the charge capacitor C ₀ . A negative terminal (30) is connected to both ends of the charge capacitor (C ₀ ) to supply power. The SCR anode terminal a is connected to the time varying voltage input unit 10 and the SCR cathode terminal c is connected to the collector terminal of the switch element 50. The SCR gate terminal g is connected to the collector terminal of the switch element 50 Is connected to the base terminal b and has one end connected to the emitter terminal e of the switch element 50 and the charge capacitor C ₀ .

The electric device in the present invention means all devices having a lower end 30 to which a constant voltage is supplied from the constant voltage circuit 100. The constant-voltage circuit 100 used in the present invention is particularly suitable for a defibrillator, an IPE device, etc., which require rapid charging because a relatively simple and inexpensive circuit can be used for charging in a relatively short time.

The ON condition of the constant voltage circuit SCR shown in FIG. 2 is similar to Equation (1), but the OFF condition is controlled according to the voltage applied to the gate terminal (g) of the SCR unlike Equation (2). In the circuit of Fig. 2, the switching element 50 is connected between the SCR cathode terminal c, the SCR anode terminal a and one terminal of the charging capacitor C ₀ , and is applied to the gate terminal g of the SCR So that the SCR can be turned off according to the applied voltage.

2 shows an example in which an npn transistor is used as the switching element 50. In the circuit configuration shown in Fig. The condition that the charge in the charge capacitor C ₀ is turned on by the charge supplied from the time-varying voltage input unit 10 in the constant-voltage circuit of FIG. 2 is expressed by Equation (3).

That is, the SCR and the switch element 50 provided between the time-base voltage input unit 10 and the charge capacitor C ₀ are switched from the off state to the on state under the condition of Equation (3) satisfying the ON condition. Here, Va is the voltage applied to the SCR anode terminal (a), Vc is the voltage applied to the SCR cathode terminal (c), Vg is the voltage applied to the SCR gate terminal (g), and Ve is the voltage applied to the emitter terminal (e). Comparing Equation (3) with Equation (1), it can be seen that the condition 'Vg>Ve' is added to Equation (3), which indicates that the condition for turning on the switch element (50) is ON. If the reference voltage value Vg set at the reference voltage section 20 is larger than the charging voltage value of the charging capacitor C ₀ while the voltage is Va and Vc in the OFF state in the constant voltage circuit 100 of FIG. 2, (50) are turned on almost at the same time, the charge supplied from the time-varying voltage input unit (10) is charged to the charge capacitor (C ₀ ). At this time, since the switch element 50 is in a conduction state, it can be seen that Vc and Ve are maintained at almost the same voltage level, so that the condition of 'Vg>Vc' is satisfied.

The condition that the charge is charged in the charge capacitor C ₀ by the charge supplied from the time-varying voltage input unit 10 in the constant-voltage circuit of FIG. 2 and the state where the charge is stopped is switched to the OFF state is expressed by Equation (4).

That is, the condition of Equation (4) implies that the charging is terminated when either the SCR or the switching element 50 provided between the time-variant voltage input unit 10 and the charging capacitor C ₀ is turned off. Fig this moment charging is done in the on state in the constant voltage circuit 100 of the second equal to the charge voltage (Ve), a reference voltage 20, the reference voltage value (Vg) is set in the charged capacitor (C ₀₎ is terminated.

Strictly speaking, since the npn transistor is used for the switch element 50 in the constant voltage circuit 100 of FIG. 2, when a voltage smaller than a forward voltage (approximately 0.1 V to 0.7 V) is applied between the base terminal and the emitter terminal, element voltage 50, the charge would therefore switched to the off-state voltage to be charged in the charging capacitor (C ₀₎ was charged to a slightly smaller level than the charge level set by the reference voltage value (Vg) to the charging capacitor (C ₀₎ If this is a fairly large value, it is a negligible difference in practice. In summary, it can be seen that the constant voltage circuit 100 of the embodiment of the present invention shown in FIG. 2 can charge the charge capacitor C ₀ to the set voltage level of the reference voltage section 20.

Hereinafter, the charging operation of Fig. 2 (a) will be described with reference to Figs. 2 (b) and 2 (c). 2 (a), the initial voltage of the charging capacitor C ₀ is 0 V, the reference voltage value set in the reference voltage unit 20 is 130 V, and the 220 V AC power source is used in the time- The operation of the circuit will be described on the assumption that it is supplied.

2 (b) shows a voltage waveform supplied from the time-variant voltage input unit 10. During the solid-line period, both the SCR and the switch element 50 are turned on, to C ₀₎ represents a state in which charges are accumulated, while the dotted line section is in a state where SCR or switch element 50 off shows a state cigar the charge at the charging capacitor (C ₀₎ does not flow in the variable voltage input section 10. FIG. 2 (c) shows the charging voltage of the charging capacitor C ₀ , which changes with time.

When a voltage is applied from the time-variant voltage input unit 10, the SCR and the switch element 50 are turned on, and electric charge starts to be accumulated in the charge capacitor C ₀ . Then, when the voltage supplied from the time-variant voltage input unit 10 begins to fall from the upper peak value, the SCR is turned off at the time ta when the voltage becomes lower than the charging voltage of the charging capacitor C ₀ (Va <Vc condition is satisfied) . It is assumed that the voltage charged in the charging capacitor C _{0 at} time ta is 80V. Since cigars voltage is greater than 80V moment to be applied in variable voltage input (10) (tb visual) SCR while being switched back to the on-state voltage charged in the beginning of the charging, and begins to drop at the upper peak value charging capacitor (C ₀₎ At time td equal to the voltage level 130V set at the reference voltage section 20, the switching element is turned off and charging stops (Ve> = Vg condition is satisfied).

The time-variant voltage input unit 10 means a circuit unit that provides a voltage value varying with time. Examples of the simplest state-of-charge voltage input unit 10 include a commercial power supply, a sawtooth wave generating circuit, and a pulse wave generating circuit. In the case of constructing an IPE device using an electric device using the constant voltage circuit according to the present invention, a low commercial power source is used depending on the country, so that it takes a long time to charge the charging capacitor. The inventor of the present invention has proposed a state-of-charge voltage input unit 10 in order to solve such a problem. FIG. 3 and FIG. 4 show one embodiment of the open circuit voltage input unit constituting the constant voltage circuit of the present invention. 3 is a circuit that is DC-biased by the upper peak value of the commercial power supply and outputs a sinusoidal wave according to the amplitude and peak value of the commercial power supply. The market-state voltage input unit 10 of FIG. Which is DC-biased by twice the upper peak value, and outputs a sine wave according to the amplitude and peak value of the commercial power supply.

The reference voltage portion 20 may be implemented using a circuit to set the charge voltage level of the charging capacitor (C _0), implemented as a DAC (Digital to Analog Converter), or the zener diode or the like.

5 is a circuit block diagram of an IPE device using a constant voltage circuit according to the present invention. The IPE device according to the present invention includes an input terminal 10, an SCR + switch element, a reference voltage unit 20, a charge capacitor C ₀ , a controller 60, a user interface unit 70, , And a xenon flash unit (90). The user interface unit 70 is constituted by an operation switch or the like, and is used for inputting the output power of the user from the user. The control unit 60 adjusts the reference voltage of the reference voltage unit 20 according to a control signal output from the user interface 70, and generates a trigger signal at an appropriate timing. The tree rejection unit 80 outputs a trigger operation signal for triggering the xenon lamp flash unit 90 according to a trigger signal input from the control unit 60 to control the emission of the xenon lamp to be turned on and off, 90) irradiates the user's skin with xenon light according to the trigger operation signal.

Up to now, a technique for constructing a constant voltage circuit using thyristors and npn transistors has been described. Instead of the thyristor, a triac may be used. The triac may consist of a first terminal, a gate, and a second terminal, and the wiring may be provided corresponding to the anode terminal, the gate terminal and the cathode terminal of the thyristor, respectively . Also, in the present invention, although only the npn transistor is mentioned as a switching element, it is needless to say that an equivalent switching element such as an FET can be used. An npn transistor is a type of bipolar junction transistor (BJT). Bipolar junction transistors are sometimes referred to as bipolar transistors when they are named separately from FETs. The FET is called a field-effect transistor and has a source terminal, a gate terminal and a drain terminal, and each terminal corresponds to an emitter terminal, a base terminal and a collector terminal of the npn transistor.

In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or &lt; / RTI &gt; includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In addition, the components shown in the embodiments of the present invention are shown independently to represent different characteristic functions, which does not mean that each component is composed of separate hardware or software constituent units. That is, each constituent unit is included in each constituent unit for convenience of explanation, and at least two constituent units of the constituent units may be combined to form one constituent unit, or one constituent unit may be divided into a plurality of constituent units to perform a function. The integrated embodiments and separate embodiments of the components are also included within the scope of the present invention, unless they depart from the essence of the present invention.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

10: Poisson side voltage input unit 20: Reference voltage unit
30: Sub terminal 50: Switch element
60:
70: user interface unit 80: tree reject
90: Xenon flash unit (90) 100: Constant voltage circuit
C ₀ : Charge capacitor a: SCR anode terminal
c: cathode terminal of SCR g: gate terminal of SCR
e: Switch element emitter terminal

Claims (9)

A constant voltage circuit capable of regulating the output voltage level and providing a constant voltage function,
A time varying voltage input unit for providing a voltage varying with time,
A charge capacitor for accumulating charge,
A thyristor and a switch element provided between the time-variable voltage input unit and the charge capacitor,
And a reference voltage unit connected to a gate terminal of the thyristor and setting a charging voltage of the charging capacitor,
Wherein the switch element is connected to a gate terminal of the thyristor, a cathode terminal of the thyristor, and one end of the charge capacitor.
The method according to claim 1,
The switching element is an npn transistor, the base terminal of the transistor is connected to the gate terminal of the thyristor, the collector terminal of the transistor is connected to the cathode terminal of the thyristor, and the emitter terminal of the transistor is connected to the one end of the charging capacitor .
3. The method of claim 2,
The gate terminal of the transistor is connected to the gate terminal of the thyristor, the drain terminal of the transistor is connected to the cathode terminal of the thyristor, and the source terminal of the transistor is connected to the one end of the charging capacitor .
A constant voltage circuit capable of regulating the output voltage level and providing a constant voltage function,
A time varying voltage input unit for providing a voltage varying with time,
A charge capacitor for accumulating charge,
A triac and a switch element provided between the time-varying voltage input unit and the charge capacitor,
And a reference voltage unit connected to a gate terminal of the triac to set a charging voltage of the charging capacitor,
Wherein the switching element is connected to a gate terminal of the triac, a second terminal terminal of the triac, and one terminal of the charging capacitor.
5. The method of claim 4,
Wherein the switch element is an npn transistor, the base terminal of the transistor is connected to the gate terminal of the triac, the collector terminal of the transistor is connected to the first terminal of the triac, and the emitter terminal of the transistor is connected to the one end of the charge capacitor And the constant voltage circuit.
5. The method of claim 4,
The gate terminal of the transistor is connected to the gate terminal of the triac, the drain terminal of the transistor is connected to the second terminal terminal of the triac, and the source terminal of the transistor is connected to the one end of the charging capacitor And the constant voltage circuit.
An electric device comprising a constant-voltage circuit according to any one of claims 1 to 6.
8. The method of claim 7,
Wherein the electric device is an IPE device for periodically irradiating a user's skin with at least one pulse of xenon lamp light to treat a skin disease.
9. The method of claim 8,
A xenon lamp flash unit,
A user interface unit including an operation switch for receiving input of an output power of the user from the user,
A control unit for adjusting a reference voltage of the reference voltage unit according to a control signal output from the user interface and generating a trigger signal,
Further comprising a tree rejection unit for outputting a trigger operation signal for triggering the xenon lamp flash unit according to the trigger signal to turn on / off the xenon lamp.

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