KR100248710B1 - Apparatus for Driving Switching element washing machine - Google Patents

Abstract

The present invention minimizes the occurrence of noise in the switching device by driving the switching device to exactly zero crossing (Zero Crossing) in the device for generating a drive signal for driving the switching device, and to the excessive voltage, current stress (Stress) The present invention relates to a driving device for a switching element of a washing machine for preventing damage to the triac, which is a switching element.

The conventional triac driving device of the washing machine could not turn on at the zero voltage of the commercial power supply, and because the signal is output through the microcomputer, this delay also occurs and the difference is further increased. Since it may be generated, even a single external noise may cause a breakage of the triac, which is a semiconductor switching element, to reduce the reliability of the washing machine.

In order to solve this problem, the present invention is a washing machine for driving a switching element to control the driving of the motor according to the type of laundry, the reset signal and driving for controlling the overall function of the washing machine system and controlling the driving of the switching element Control means for outputting a clock signal, and a comparison of outputting the result value by comparing a predetermined commercial power supply with a diode and receiving a signal distributed through a distribution resistor and comparing a preset reference voltage to detect a zero voltage. Means, edge detection means for detecting rising and falling edges of the comparison means according to the signals output from the control means and the comparison means and outputting a pulse signal for each of the rising and falling edges, and the pulse signal output from the edge detection means. According to the present invention, the motor is configured as a switching element that rotates in a forward / reverse direction.

Description

Apparatus for Driving Switching element washing machine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine, and in particular, in a device that generates a driving signal for driving a switching element, the switching element can be precisely zero-crossed and driven to minimize noise generation in the switching element, and excessive voltage, The present invention relates to a switching device driving apparatus of a washing machine for preventing damage to triac, which is a switching device due to current stress.

In a typical washing machine, a motor is required for a very short moment because a multi-stage output is required from a motor at a low speed to a high speed.

In particular, when washing soft cloth such as wool or lingerie, the motor should be rotated at a very low speed.

Therefore, the motor drive switch requires a fast semiconductor device.

The most suitable semiconductor device here uses a triac as a switching device that can switch large currents and voltages.

However, the triac is a semiconductor device, which is easily broken by the stress of voltage and current due to the characteristics of the semiconductor.

Therefore, the triac drive must be very careful.

That is, as shown in the triac driving apparatus of the conventional washing machine of FIG. 1, the commercial power source AC is connected to one end of the motor 2, and the other direction of the motor 2 is the triac T1. In connection with the operation of the triac T1, the motor 2 is driven.

Therefore, the triac T1 does not receive any voltage or current stress only when the trigger signal is turned on at the point where the commercial power is zero.

The trigger signals are generated by the resistors R114 and R115, the diodes D113, SD111 and SD112, and the transistor Q111.

In addition, FIG. 2 is a voltage waveform diagram of the points (a), (b) and (c) of FIG. 1.

First, (a) indicates a commercial power source (AC), and is a power source after only a positive voltage is passed through the diode D113.

In addition, (c) is a collector signal of the transistor Q111, that is, a signal sent to the microcomputer.

In order to operate the transistor Q111, 0.7V is required. This signal is generated in a 220V commercial power supply, and a large resistance loss is generated in the remaining voltage processing.

Attempting to generate a square wave by completely saturating the actual transistor requires a large base current, resulting in very large losses in resistors R114 and R115.

This results in a resistive loss of more than one watt to fully conduct the transistor.

In addition, since the transistor requires a voltage of 0.7 V, there is a gap as much as td from the zero point of the commercial voltage.

On the other hand, the microcomputer receives this signal and detects a rising edge and a falling edge and outputs the detected signal, thereby delaying the time for driving the triac T1.

However, such a triac driving apparatus of the conventional washing machine has a problem that it cannot be conducted at an accurate commercial power zero voltage.

In addition, since the signal is output through the microcomputer, this also causes a delay, which makes the difference even larger. Therefore, the malfunction of the external noise may occur due to the characteristics of the microcomputer, thereby causing the breakdown of the triac, which is a semiconductor switching element, to the external noise, thereby reducing the reliability of the washing machine.

Accordingly, an object of the present invention is to minimize the generation of noise in the switching device by accurately zero-crossing the switching device in a device generating a driving signal for driving the switching device, and excessive voltage and current stress. The present invention provides a switching device driving apparatus for a washing machine for preventing damage to a triac, which is a switching device due to stress.

Technical means of the present invention for achieving this object, in the washing machine for driving the switching element to control the driving of the motor according to the type of laundry,

Control means for controlling the overall function of the washing machine system and outputting a reset signal and a driving clock signal for controlling the driving of the switching element;

Half the predetermined commercial power (AC) to the diode (D11) and receives the signal distributed through the distribution resistors (R15, R14) and compares with the preset reference voltage to detect the zero voltage and outputs the result value Comparative means for doing;

Edge detecting means for detecting rising and falling edges of the comparing means according to the signals output from the control means and comparing means and outputting pulse signals for each of the rising and falling edges; And

It characterized in that it comprises a switching element 104 for rotationally driving the motor in the forward / reverse direction according to the pulse signal output from the edge detection means.

1 is a circuit diagram illustrating a triac driving device of a conventional washing machine;

FIG. 2 is a diagram illustrating voltage waveforms at points A, B, and C of FIG. 1;

3 is a circuit diagram illustrating a switching device driving apparatus of a washing machine according to the present invention;

4 is a detailed circuit diagram of an edge detector applied to FIG. 3;

FIG. 5 is a diagram illustrating input / output operation waveforms of FIG. 4;

6 is a diagram illustrating an output waveform and a commercial power supply input waveform of the comparator of FIG. 3.

Explanation of symbols on the main parts of the drawings

101: comparison unit 102: edge detection unit

103: control unit 104: triac

105: motor

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a circuit diagram of a switching device driving apparatus of a washing machine according to the present invention, and FIG. 4 is a detailed circuit diagram of an edge detector applied to FIG. 3. The commercial power AC is half-waved and distributed to a diode D11. A comparator 101 which receives a signal distributed through the resistors R15 and R14 and compares the result with a preset reference voltage to detect a zero voltage and outputs a result of the comparison; A reset signal for detecting a rising or falling edge of the generated signal and generating a switching control signal at the rising and falling edges, and a reset signal for controlling the switching element in the edge detecting unit 102 for an arbitrary time; In addition to generating a driving clock signal, the control unit 103 controls the overall function of the system and the switching control signal output from the edge detection unit 103 is conducted to rotate the motor 105 in the forward / reverse direction. It is comprised by the triac 104 which drives.

In the above, the edge detector 102 is operated according to the reset signal input to the first de-flip flop (102a) for outputting the signal output from the comparison means in synchronization with the clock (CLK_4), and the input reset signal And a second de-flip flop 102a for outputting the signal output from the first de-flip flop 102a in synchronization with a clock CLK_4 and the first de-flip flop 102a. A first NAND gate 102c which performs a negative AND operation on the signal output from the output terminal Q and the signal output from the output terminal Qn of the second de-flip flop 102b input to the other side, and outputs the first NAND gate 102c; A second NAND gate 102d that performs a negative AND operation on the signal output from the output terminal Qn of the flip-flop 102a and the signal output from the output terminal Q of the second de-flop flop 102b input to the other side. ) And an edge pulse (negative AND) of the signals output from the first and second NAND gates 102c and 102d, respectively. And a third NAND gate 102e for outputting Edge_Pulse).

Referring to Figures 3 to 6 attached to the operation and effect of the present invention configured as described above are as follows.

First, the diodes D11 and D12 and the distribution resistors R15, R12, R13, and R14 are connected to the input terminal of the comparator 101 in order to accurately detect the zero voltage of the commercial power source AC.

Then, the non-inverting terminal (+) of the comparator 101 receives the signal distributed through the distribution resistors R15 and R14 when the commercial power AC is half-waved by the diode D11.

On the other hand, the inverting terminal (-) of the comparator 101 is a predetermined reference voltage in order to detect a zero voltage, and the voltage divided by the distribution resistors R12 and R13 enters.

Here, 0.1V was applied to the inverting terminal of the comparator 101, which was set to almost zero voltage with a voltage much smaller than 0.7V between the base and emitter of the transistor shown in FIG.

Accordingly, the comparator 101 compares a signal input through the distribution resistors R15 and R14 with a preset reference voltage to detect a zero voltage and outputs the result value.

That is, since the output of the comparator 101 is designed to operate at the zero point of the commercial power supply, the generated square wave is input to the edge detector 102.

6 shows the waveform output from the comparator 101 and shows the signal of the commercial power supply and the output of the comparator 101.

As shown in the figure, it can be seen that a square wave comes out at an almost accurate zero point, and the duty ratio of on-off is 50.2%.

In addition, since the common 1 / 4W and 1 / 8W resistors are sufficient, they can be made sufficiently in the future semiconductor process, and thus they can be implemented in even smaller sizes.

On the other hand, the square wave shown in FIG. 6 is immediately input to the edge detector 102, which detects the rising and falling edges of the signal output from the comparator 101 and switches on the rising and falling edges. The control signal is generated.

That is, as shown in FIG. 4, the first and second de-flip flops 102a and 102b in the edge detector 102 operate according to an input reset signal to clock the signal output from the comparator 101. Output in synchronization with (CLK_4).

Then, the first and second NAND gates 102c and 102d detect rising and falling edges, respectively, to negate and multiply the signals output from the first and second de-flip flops 102a and 102b, respectively. Output to NAND gate 102e.

Accordingly, the third NAND gate 102e negatively ORs the two signals output from the first and second NAND gates 102c and 102d, respectively.

At this time, the output edge pulse is a pulse appears when the zero voltage.

The operation waveform diagram of this circuit shows that signal pulses are output at the edge portion of Input-60 Hz as shown in FIG.

Since it operates in hardware, the control element 103 sends a signal for driving the switching element, that is, the triac 104 only when the voltage is zero, so that the breakage of the triac 104 can not be prevented in any case. have.

In addition, when the triac 104 is operated for a desired time, the controller 103 sends a "high" signal to the reset of the edge detector 102 for the desired time for the triac 104 to be driven along the edge of the square wave. Make a pulse.

Here, the driving clock CLK_4 signal can be given by the control unit 103, and one used in another circuit can be used.

Accordingly, the triac 104 is conducted according to the triac driving signal output from the edge detector 102 to drive the motor 105 in the forward / reverse direction.

As another embodiment of the present invention, the diode D11 of FIG. 3 is removed and the zener diode is connected in parallel with the resistor R14 so that the input voltage of the comparator 101 comes only from -0.7V to the zener voltage. Thus, this can also produce the same effect as described in detail above.

As described above, according to the present invention, by switching the switching device, that is, the triac to exactly zero voltage, a low-consumption device capable of improving the overall reliability of the washing machine and making all the components IC can be used. There is an effect that can be simplified more, and the compactness of such a circuit (compact) has an effect that can design the design of the washing machine more efficiently.

Claims (2)

In the washing machine for driving the switching element to control the driving of the motor according to the type of laundry, Control means for controlling the overall function of the washing machine system and outputting a reset signal and a driving clock signal for controlling the driving of the switching element; A comparison means for half-waves a predetermined commercial power supply with a diode, receives a signal distributed through a distribution resistor, and compares it with a preset reference voltage to detect a zero voltage and outputs a result value; Edge detecting means for detecting rising and falling edges of the comparing means according to the signals output from the control means and comparing means and outputting pulse signals for each of the rising and falling edges; And And a switching device for rotationally driving the motor in a forward / reverse direction according to the pulse signal output from the edge detection means. The method of claim 1, The edge detection means, A first de-flip flop 102a operated according to an input reset signal and outputting the signal output from the comparing means in synchronization with a clock CLK_4; A second de-flip flop 102a operated according to the reset signal to output a signal output from the first de-flip flop 102a in synchronization with a clock CLK_4; A first negative-OR product of the signal output from the output terminal Q of the first de-flop flop 102a and the signal output from the output terminal Qn of the second de-flop flop 102b input to the other side NAND gate 102c, A second non-OR product of the signal output from the output terminal Qn of the first de-flop flop 102a and the signal output from the output terminal Q of the second de-flop flop 102b input to the other side NAND gate 102d, and The device for driving a switching device of a washing machine, comprising a third NAND gate 102e configured to output an edge pulse Edge_Pulse by negatively multiplying the signals output from the first and second NAND gates 102c and 102d, respectively. .

Images