JP3097122U - Dual input rectifier - Google Patents

Abstract

A dual input rectifier is provided, which solves the situation where the rectifier cannot be applied to various types of input power supplies.
A dual-input rectifier receives a first AC voltage from a first input terminal and a third input terminal, or receives a second AC voltage from a second input terminal and a third input terminal to output a DC voltage. A first diode, a second diode, a third diode and a fourth diode, connected in series with each other, and a first filter capacitor and a second filter capacitor connected in series with each other; An anode terminal of the first filter capacitor is connected between the first diode and the third diode, a cathode terminal of the second filter capacitor is connected between the second diode and the fourth diode, and a first input terminal. Is connected between the first filter capacitor and the second filter capacitor, the second input terminal is connected between the first diode and the second diode, and the third input terminal is connected to the third diode and the fourth diode. It is connected between the diode.
[Selection diagram] FIG.

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a dual-input rectifier, and more particularly to a dual-input rectifier applied to a motor controller, a general-purpose frequency converter, a brushless or brushed DC motor driver, an AC servomotor driver, and the like.
[0002]
[Prior art]
AC motors are the motors with the widest range of applications among various types of motors. In recent years, with the advancement of electric power, electronics, and motor control technology, the performance of AC motor drivers has been improved, and the range of applications has become even wider, and the price Are becoming cheaper and competition is fierce. Among them, the frequency converter for controlling the AC motor has the highest product replacement speed in the market, and the performance and price competition is the most intense. 2. Description of the Related Art A frequency converter is a power converter that mainly provides a variable frequency and a variable voltage, and is applied to a shift control of an AC motor by an open circuit method, which is mainly performed through a rectifier. The input AC voltage is converted into a DC voltage.
[0003]
The rectifier applied to the frequency converter is as shown in FIG. 1, which is a rectifier currently used in a 110V AC power supply, which is a full-wave voltage doubler circuit. It comprises a rectifier diode unit composed of a first diode D1 and a second diode D2 connected in series with each other, and a first filter capacitor C1 and a second filter capacitor C2 connected in series with each other. Rectifier diode unit and filter capacitor unit are connected in parallel with each other. In addition, a first input terminal IP1 connected between the first filter capacitor C1 and the second filter capacitor C2, and a second input terminal connected between the first diode D1 and the second diode D2. The input is an AC 110V power supply and the output is a DC 310V power supply. The standard of the first filter capacitor C1 and the second filter capacitor C2 may be 200V / 470μ. If a 220V power supply is accidentally input, the output will be 620V DC, based on the voltage doubler characteristics of this circuit, but the voltage that can be received by the capacitor is 400V (200V + 200V). The voltage will be above the level and the capacitor will be damaged by the overvoltage.
[0004]
A rectifier applied to another frequency converter is as shown in FIG. 2, which is a rectifier currently used for 220V AC power supply, which is a full-wave rectifier circuit. It comprises two sets of rectifier diode units connected in parallel with each other, each diode unit being composed of two diodes connected in series with each other, respectively a first diode D1, a second diode D2 and a second diode D2. There is a third diode D3 and a fourth diode D4, and a third filter capacitor C3 connected in parallel with the two rectifier diode units. In addition, a first input terminal IP1 connected between the third diode D3 and the fourth diode D4, and a second input terminal IP2 connected between the first diode D1 and the second diode D2. The input is an AC 220V power supply and the output is a DC 310V power supply. The specification of the third filter capacitor C3 may be 400 V / 180 μ. If a 110V power supply is accidentally input, the output will be 155V DC, but in a general design the circuit will not operate unless the DC output exceeds 170V, so the circuit will not operate in this situation.
[0005]
Rectifiers designed for two different types of AC power supply are extremely inconvenient for those who currently export their products to different countries, and are also quite inconvenient for users. Since it can be used only for one type of AC power source, if you want to use another AC power source, you have to adopt electronic components or use a different frequency converter outside the specified range . Furthermore, careless and incorrect power input by the user results in damage.
[0006]
[Problems to be solved by the invention]
In view of the above problems, a main object of the present invention is to provide a dual input rectifier, thereby solving the situation where the rectifier cannot be applied to various types of input power.
[0007]
[Means for Solving the Problems]
Therefore, in order to achieve the above object, the dual input rectifier disclosed in the present invention includes a first diode, a second diode, a third diode and a fourth diode, which are connected in series, and a series diode. A first filter capacitor and a second filter capacitor connected to each other, the anode terminal of the first filter capacitor being connected between the first diode and the third diode, and the cathode terminal of the second filter capacitor; Is connected between the second diode and the fourth diode, a first input terminal is connected between the first filter capacitor and the second filter capacitor, and is connected between the first diode and the second diode. Has a second input terminal connected thereto, and a third input terminal connected between the third diode and the fourth diode.
[0008]
According to the above arrangement, a first AC voltage is input from the first input terminal and the third input terminal to output the DC voltage, and a second AC voltage is input from the second input terminal and the third input terminal. To output the DC voltage.
[0009]
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0010]
[Embodiment of the invention]
Shown in FIG. 3 is a circuit diagram of a dual input rectifier disclosed in the present invention, which includes a first rectifier diode unit, a second rectifier diode unit, and a filter capacitor unit. . The first rectifier diode unit includes a first diode D1 and a second diode D2 connected in series. The second rectifier diode unit is connected in parallel with the first rectifier diode unit, and includes a third diode D3 and a fourth diode D4 connected in series. The filter capacitor unit is connected in parallel with the second rectifier diode unit, and includes a first filter capacitor C1 and a second filter capacitor C2 connected in series.
[0011]
According to the above arrangement, a first AC voltage is input from the first input terminal IP1 and the third input terminal IP3 to output the DC voltage, and a second AC voltage is output from the second input terminal IP2 and the third input terminal. The DC voltage is output from IP3.
[0012]
In the dual-input rectifier disclosed in the present invention, two types of AC voltages are input and a DC voltage is output, so that the situation that it cannot be applied to two types of AC voltages in a known rectifier is improved. ing.
[0013]
The first AC voltage mentioned here represents an AC voltage of 110 V, and the second AC voltage represents an AC voltage of 220 V. Hereinafter, how to apply the present invention to different AC voltages will be described. First, since the second AC voltage is twice as large as the first AC voltage, when the first AC voltage is output as 220V, the second AC voltage is 440V. Hereinafter, 110 V will be described as a representative.
[0014]
In the present invention, a diode and a capacitor are used as rectifier elements, the diode is a circuit switching element with two connection pins, and the capacitor is an energy storage element.
[0015]
When an AC voltage of 110 V is to be input, the circuit at that time is connected in series with a rectifier diode unit composed of a third diode D3 and a fourth diode D4 connected in series with each other. It can be considered that only the filter capacitor unit including the first filter capacitor C1 and the second filter capacitor C2 is provided, of which the rectifier diode unit and the filter capacitor unit are connected in parallel with each other. In addition, the first input terminal IP1 is connected between the first filter capacitor C1 and the second filter capacitor C2, and the third input terminal IP3 is connected between the third diode D3 and the fourth diode D4. The input is an AC 110V power supply and the output is a DC 310V power supply. The anode end of the first filter capacitor C1 is connected between the first diode D1 and the third diode D3, and the cathode end of the second filter capacitor C2 is connected between the second diode D2 and the fourth diode D4. Therefore, the standard of the first filter capacitor C1 and the second filter capacitor C2 can be set to 200 V / 470 μ.
[0016]
At this time, 110 V is input as the first AC voltage, input from the first input terminal IP1 and the third input terminal IP3, and the second input terminal IP2 is disconnected because no power is input, and the second input terminal IP2 is disconnected due to the switching characteristics of the diode. The first diode D1 and the second diode D2 exhibit a non-operation state.
[0017]
When a positive cycle of the AC voltage is input, the third diode D3 has a closed state and the fourth diode D4 has an open state, so that a negative cycle current is obtained. When a negative cycle is input, the third diode D3 exhibits an open state and the fourth diode D4 exhibits a closed state, so that a current having a negative cycle is obtained. Finally, through the action of the second filter capacitor C1 and the second filter capacitor C2, the positive and negative cycle voltages obtained there are converted and output as voltages approximating DC.
[0018]
When an AC voltage of 220 V is to be input, the rectifier circuit at that time is considered to have two sets of rectifier diode units connected in parallel, and each diode unit has two diodes connected to each other. The first and second diodes D1 and D2 and the third and fourth diodes D3 and D4 are connected in series. Also provided is a filter capacitor unit composed of a first filter capacitor C1 and a second filter capacitor C2 connected in series with each other, of which the rectifier diode unit and the filter capacitor unit are connected in parallel with each other. Further, the first input terminal IP1 is connected between the first filter capacitor C1 and the second filter capacitor C2, the second input terminal IP2 is connected between the first diode D1 and the second diode D2, Since the input terminal IP3 is connected between the third diode D3 and the fourth diode D4 and a 220 V power supply is used, no voltage is input to the first input terminal IP1. The input is an AC 220V power supply and the output is a DC 310V power supply. Among them, the standard of the first filter capacitor C1 and the second filter capacitor C2 can be set to 200V / 470μ. The effect is obtained.
[0019]
At this time, 220V is input as the second AC voltage, input from the second input terminal IP2 and the third input terminal IP3, and no power is input to the first input terminal IP1.
[0020]
When the positive and negative cycles of the AC voltage are input, the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 are opened and closed in different positive and negative cycles, respectively, and a voltage is obtained. Finally, through the action of the first filter capacitor C1 and the second filter capacitor C2, the positive / negative cycle voltage obtained there is converted and output as a voltage approximating DC.
[0021]
The above description has been made with reference to AC voltages of 110V and 220V. In the voltage doubler rectifier circuit adopted in the present invention, when the first AC voltage is 110 V, a voltage of 310 V DC (110 × 2 × √2 = 310) is output after rectification, and 220 V of the second AC voltage is output. When input, after rectification by the rectifier disclosed in the present invention, a voltage of DC 310 V (220 × √2 = 310) can be similarly output. Taking the above description as an example, the purpose of the 110V voltage boost is to conform to 220V, and since the output DC voltage is 310V regardless of the voltage output of 110V or 220V. The dual-input rectifier disclosed in the present invention can be applied to two types of AC voltages, and outputs the same DC voltage.
[0022]
[Effect of the invention]
The dual-input rectifier disclosed in the present invention is improved in a situation where two types of AC voltages are input and a DC voltage is output, and the conventional rectifier cannot be applied to the two types of AC voltages. There are provided three input terminals, and the user can add one kind of input power, that is, it can be applied to 110V AC power or 220V AC power. Further, carelessness can be prevented by using a plastic mechanism component, and a wiring error of a wiring person can be prevented.
[0023]
Although the preferred embodiment is disclosed in the present invention as described above, it is not intended to limit the present invention, and those skilled in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. It is possible to do. Therefore, the scope of protection of the rights of the present invention should be based on the claims of utility model registration attached to this description.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a rectifier applied to a 110V AC power supply.
FIG. 2 is a circuit diagram of a rectifier applied to a 220V AC power supply.
FIG. 3 is a circuit diagram of a dual input rectifier disclosed in the present invention.
[Explanation of symbols]
D1 first diode D2 second diode D3 third diode D4 fourth diode C1 first filter capacitor C2 second filter capacitor C3 third filter capacitor IP1 first input terminal IP2 second input terminal IP3 third input terminal

Claims (12)

A dual-input rectifier that inputs two types of AC voltage and outputs DC voltage,
A first diode, a second diode, a third diode and a fourth diode connected in series with each other, a second input terminal being connected between the first diode and the second diode, A third input terminal is connected between the third diode and the fourth diode,
A first filter capacitor and a second filter capacitor that are connected to each other in a series manner; an anode end of the first filter capacitor is connected between the first diode and the third diode; A cathode terminal of the two filter capacitors is connected between the second diode and the fourth diode, and a first input terminal is connected between the second filter capacitors and the second filter capacitors. ,
A first AC voltage is input from the first input terminal and the third input terminal to output the DC voltage, and a second AC voltage is input from the second input terminal and the third input terminal to output the DC voltage. And a dual input rectifier. The dual input rectifier according to claim 1, wherein the second AC voltage is twice the first AC voltage. The dual input rectifier according to claim 2, wherein the first AC voltage is 110V. The dual input rectifier according to claim 3, wherein the second AC voltage is 220V. The dual input rectifier according to claim 2, wherein the first AC voltage is 220V. The dual input rectifier according to claim 5, wherein the second AC voltage is 440V. A dual-input rectifier that inputs two types of AC voltage and outputs DC voltage,
A first rectifier diode unit including a first diode and a second diode connected to each other in a series manner, and a second input terminal connected between the first diode and the second diode;
A third diode and a fourth diode are connected in parallel with the first rectifier diode unit, and are connected to each other in series. A third diode and a fourth diode are provided between the third diode and the fourth diode. A second rectifier diode unit to which three input terminals are connected;
A first filter capacitor and a second filter capacitor that are connected in parallel with the second rectifier diode unit and that are connected to each other in series; and that the first filter capacitor and the second filter capacitor are connected to each other. A filter capacitor unit to which the first input terminal is connected,
A first AC voltage is input from the first input terminal and the third input terminal to output the DC voltage, and a second AC voltage is input from the second input terminal and the third input terminal to output the DC voltage. And a dual input rectifier. The dual input rectifier according to claim 7, wherein the second AC voltage is twice the first AC voltage. The dual input rectifier according to claim 7, wherein the first AC voltage is 110V. The dual input rectifier according to claim 9, wherein the second AC voltage is 220V. The dual input rectifier according to claim 7, wherein the first AC voltage is 220V. The dual input rectifier according to claim 11, wherein the second AC voltage is 440V.

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