KR960002298Y1 - Dc/ac conversion apparatus - Google Patents

Abstract

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Description

DC / AC converter

1 is a circuit diagram of a direct current (EC) / AC (AC) conversion device of the present invention

(A) of FIG. 2 is an external perspective view of the DC / AC converter of the present invention.

(b) is a right side view of a DC / AC converter of the present invention;

* Explanation of symbols for main parts of the drawings

1: DC input unit 2: DC output unit

3: oscillation amplifier section 4: frequency division circuit section

5 AC output unit 6 modulation circuit unit

7: heat detection unit 8: alarm circuit unit

The present invention relates to a direct current (DC) / alternating current (AC) converter (inverter) for converting and outputting the DC power output from the battery of the vehicle to use AC power.

Conventional direct current (DC) / AC (AC) converter is connected to the cigarette lighter jack of the vehicle to convert the DC power of the battery to use AC power, amplifying the input DC power and switching the amplified DC power After converting to AC power, this AC power is supplied to other AC products by using an outlet. Since the conventional DC / AC converter outputs only AC power, other DC power sources are used. The equipment has limitations that cannot be connected and used, and since the power cord is a straight cord, you have to bear the inconvenience caused by the interference of the cord during use, and simply switch the direct current to convert it into alternating current. There are problems of this deterioration, and it is difficult to prevent damage to the circuit elements due to the monitoring of the operating state of the device or the generation of heat.

The present invention oscillates and amplifies the DC power, divides the frequency, outputs rated commercial AC power, and also has an output terminal of DC power so that DC power can be supplied to a product using DC as a power source. DC / AC conversion that prevents thermal damage of the device by detecting the means to detect and execute an alarm and uses the power cord as a coil type cord for convenience of use An object of the present invention is to provide an apparatus, and the configuration of the present invention and its effects will be described below with reference to the accompanying drawings.

First, referring to FIGS. 1 and 2 (a) and (b), the direct current (DC) / AC converter according to the present invention uses a direct current power source output from a cigarette lighter jack in a battery of a vehicle. DC input unit (1) including a spiral cord (IA) for input to the device, DC output socket for branching and outputting the DC power input through the DC input unit (1) for use in connection with other equipment (2A) and (2B) a direct current output unit (2), and the oscillation amplification unit (3) for switching the DC power input through the direct current input unit (1) to oscillate AC and amplify the oscillated AC signal; Up-down symmetry based on the division circuit unit 4 for dividing and outputting the AC signal output from the oscillation amplifier section 3 at the frequency of commercial AC power supply, and the AC power output from the frequency distribution circuit section 4 before zero. Power amplification at switching frequency of final commercial AC AC output unit 5 for outputting power and the signal output from the oscillation amplifying unit 3 are input to perform pulse width modulation (PWM) control by stabilizing the output power by using this signal, alarm and buzzer Modulation circuit section 6 for driving and heat detection section 7 for detecting heat generated during operation of the device and comparing the detected heat with a reference value to stop the operation of the device and performing alarm control when the reference value is exceeded. And an alarm circuit unit 8 that receives the signal and sounds an alarm when an excessive heat generation is detected by the heat detection unit 7.

The working effect of the DC / AC converter of the present invention configured as described above is as follows.

The DC input unit 1 inputs a DC power output from the battery of the vehicle to the device.

That is, when the cigarette lighter jack of the vehicle and the spiral cord 1A are connected, the DC power output from the cigarette lighter jack passes through the spiral cord 1A to the input terminal of the DC / AC converter. ), And the input power is applied to the primary side of the transformer T1, where the cord 1A is helical and the cord 1A of the helical is not closely contacted, i. Since it is twisted helically while maintaining the heat, heat generated from the cord 1A is dissipated through sufficient space.

For reference, in the related art, the power cord 1A cannot be helically formed. When the power coat 1A is helically formed, the coils of the spiral cords are in close contact with each other. This is because the space is reduced and the shortening of the life due to the damage and deterioration of the cord is caused. In the present invention, the cord 1A is formed in a spiral shape, but the coil part is formed so that sufficient space 1B is required for heat dissipation between adjacent coil parts. It is possible to configure the power cord 1A with a spiral cord. As the cord 1A is formed in a spiral manner, the power cord is kept neatly, so that the use of a DC / AC converter by the cord Interference is prevented.

In the DC input unit 1, D15 is a reverse current blocking diode, and C19 and C24 are capacitors.

As described above, since the DC power inputted through the DC input unit 1 is directly outputted through the DC output unit 2 including the cigarette lighter sockets 2A and 2B, the DC power supply as shown in FIG. Cigar lighter sockets (2A) and (2B) installed on one side of the body (9) of the DC / AC converter enable the use of existing DC power products.

For reference, conventionally, when connecting an inverter that draws a direct current from a cigarette lighter jack and converts it into an alternating current, the existing direct current output terminal is lost. Therefore, a product using direct current as a power source has a limitation in that it cannot be used at all. .

As described above, the direct source power source is input to the DC input unit 1 to the anti-vibration amplifier 3.

The oscillating amplifier 3 rectifies the rectifier diode D16 by applying the DC power applied to the transformer T1 to the secondary side of the transformer T1, and applies this power to the transistors Q1, Q2, Q4, and Q5. And oscillation and amplification by the oscillation and amplification circuit composed of Q6) and the NOA gate IC U1, and supply this amplified power supply to the frequency division circuit section 4.

The NOR gate IC U1 uses the MC14001 IC and the pin arrangement of the IC is shown in the drawing.

That is, the signals input to pins 5 and 6 of the Noah gate IC U1 are output to pin 4 to turn on or off the light emitting diode LED1, and pins 7 and 14 are the power supply (Vss) (Vdd) terminals. The signals input to pins 8 and 9 are outputted to pin 10 to turn transistors Q1 and Q2 on and off, and transistors Q5 and Q6 by turning on and off transistors Q1 and Q2. Is switched so that the AC power is maintained on the secondary side of the transformer T1, while the induced AC power is supplied to the frequency divider circuit 4.

A power supply Vss is applied to pin 7 of Noah gate IC U1 through zener diode D14 and transistor Q4, and the signal output from frequency divider circuit 4 is input to pins 1 and 2. It is output to pin 3 and the output of pin 3 is supplied to the AC output unit 5.

In addition, the output of the frequency divider circuit 4 is input to pins 12 and 13 of the NOA gate IC U1 and output to pin 11, and the output of pin 11 is supplied to the AC output unit 5.

In the oscillation amplifier 3, CE13, C33, C23, C32, CE14 are capacitors, D13 is diodes, R2, R29, R40, and R41 are resistors.

The frequency divider circuit 4 divides and outputs the oscillation voltage input from the oscillation amplifier 3 at an AC frequency of 60 Hz.

That is, the counter / oscillator IC (U2) uses MC4060B as a 14-bit binary counter and oscillator IC. Pin 16 is the power supply (VDD) terminal, pin 12 is the reset terminal, and pin 11 is the crystal oscillator (X). -TAL) receives the oscillated clock and counts it and outputs it to pins 10 (clock output) and 4, 6, 13, and 14 (count output).

The signal output to pin 14 is supplied to pins 1 and 2 of Noah gate IC (U1), and the signal output to pin 13 is supplied to pins 12 and 13 of Noah gate IC (U1) and NAND. The signal output to pin 1 of the gate IC U3 and output to pin 6 is supplied to pin 13 of the NAND gate IC U3, and the signal output to pin 4 is the NAND gate IC U3 through the resistor R28. It is supplied with pin 12 of).

Pin 8 of the counter / oscillator IC (U2) is the ground (Vss) power supply terminal, R42, R43, R44, and R45 are resistors, and C14, C15, C16, C17, and C18 are capacitors.

The AC output unit 5 outputs a commercially available AC power source of 60 Hz which is vertically symmetrical with respect to zero potential using the signals input from the oscillation amplifier 3 and the frequency divider circuit 4.

In the AC output section 5, U3 is a 2-input 4-nAND gate IC, (HD14011B) is NAND gate IC (U3), pin 7 is ground (VSS) power terminal, pin 14 is power (V _DD ) terminal, 12 Signals inputted into pins 13 and 13 are outputted to pin 11 and inputted to pin 9, signals inputted to pins 9 and 8 are outputted to pin 10, and signals outputted to pin 10 are inputted to pins 5 and 2. do.

Signals inputted to pins 5 and 6 are outputted to pin 4 to switch on / off transistors Q9 and Q12, and signals inputted to pins 1 and 2 are outputted to pin 3 so that transistors Q10 ( Switch on / off Q8).

Transistor Q11 is switched on / off by transistor Q9, transistor Q7 is switched on / off by transistor Q10, and as described above, transistors Q7 and Q8 are switched on. As it is turned on / off, commercial AC power of 60 Hz, which is symmetrical with zero potential as a reference point, is output from an output terminal GND (HOT) NEUT and is output through an AC outlet 10 or 11.

On the other hand, the modulation circuit unit 6 receives the power supplied to the secondary side of the transformer T1 of the oscillation amplifier 3 through the diode D13 and performs PWM control to stabilize the oscillation amplifier 3. .

In the modulation circuit section 6, U4 is such a pulse width modulation control IC, pin 12 is a power supply (Vcc) terminal, pin 7 is a ground (GND) terminal, pin 8 is an output terminal, and the signal output from pin 8 is used. Is input to pin 9 of the NOA gate IC U1 of the oscillation medium width section 3 and supplied as a switching control signal of transistors Q1 and Q2.

Pin 16 of the pulse lock modulation modulation control IC (U4) is a non-inverting input terminal, pin 6 is a terminal for connecting timing resistors, pin 4 is a dead time control terminal, and pin 1 is a non-inverting input terminal. , Pin 9 is error output terminal, pin 13 is output control terminal. Pin 15 is the inverting input terminal, Pin 14 is the reference output (Ref) output terminal, Pin 3 is the feedback input terminal, Pin 5 is the terminal for connecting the timing capacitor.

The pulse width modulation control IC (U4) has an internal oscillation frequency determined by a timing capacitor and a resistor connected to pins 5 and 6, and is subjected to dead time control by a signal input to pin 4, and a non-inverting input terminal ( PWM comparison is performed by amplifying the error of each of the two signals inputted through pin 1), inverting input terminal (pin 15), non-inverting input terminal (pin 16), and inverting input terminal (pin 2). The oscillation operation of the oscillation amplifier 3 is stabilized by outputting to the output terminal (pin 8) according to the control of the control terminal (pin 13). In the modulation circuit section 6, the resistors R1, R3-R9, R16-R23, R30 are resistors added for the operation of the pulse width modulation control IC U4 described above, and the capacitors C4, C5, C8, C26, CE1, CE6, CE7, CE8, and CE10 are resistors added for the operation of the pulse width modulation control IC U4 described above, and transistor Q3 uses the reference voltage value output from pin 14 to determine the ratio of pin 1. A transistor for applying a signal to an inverting input terminal.

The heat detector 7 detects heat generated during operation in the device, and when excessive heat is generated, stops the operation of the entire circuit to prevent damage to the circuit elements.

That is, the thermistor RT1 changes the resistance value due to heat generated during operation in the device, and determines that excessive heat is generated by inputting the change in the resistance value to the operational amplifier IC U5.

The operational amplifier IC (U5) has 4 pins as the power supply (Vcc) terminal, 11 pins as the ground terminal, and it compares the input signals of pins 5 and 6 and outputs them to pin 7 and inputs to pins 12 and 13 It compares the signal and outputs it to pin 14, and it has four operational amplifiers (used as a comparator) that compares the signals input to pins 9 and 10 and outputs it to pin 8.

Therefore, the voltage value input to pin 9 is changed according to the resistance value change (depending on the heat detection) of thermistor RT1, and this voltage value is compared with the reference voltage input to pin 10. If exceeded, the heat detection signal output from pin 8 is input to pins 5 and 12 through diode D5.

The signal input to pin 5 is compared with the reference voltage input to pin 6 and amplified and output to pin 7. The signal output to pin 7 is the dead time control terminal of the pulse width modulation control IC (U4) through the diode (D1). The input signal is input to pin 4, and accordingly, the pulse width modulation control IC U4 stops the oscillation and amplification operation of the oscillation amplifier 3 to stop the control operation, thereby preventing damage to the circuit device. The signal input to pin 12 of (U5) is amplified with the voltage input to pin 13 and output to pin 14, and the output signal of pin 14 drives the buzzer (BZ) of the alarm circuit unit 8 to generate an alarm sound. This will let the user know that it is overheated.

In the heat sensing unit 7, D2 and D4 are diodes, R10, R11, and R24-R27 are resistors, CE2 and CE9 are capacitors. R14 and R15 are resistors.

As described above, according to the present invention, even while using alternating current electronic and electrical products, another DC product can be used by using a plurality of cigarette lighter jacks installed on one side of the main body of the device, and thus a coil cord is used. Minimize the interference by code at the time of use to improve the convenience of using and handling the device.

Claims (1)

DC input unit 1 including a spiral cord 1A for inputting DC power output from the cigarette lighter jack from the battery of the vehicle to the device, and DC power input through the DC input unit 1 to other equipment. DC output unit 2 having a DC output socket (2A) (2B) for branched output for connection and use, and switching the DC power input through the DC input unit 1 to oscillate and oscillate AC An oscillation amplifier section 3 for amplifying the alternating AC signal, a division circuit section 4 for dividing and outputting an AC signal output from the oscillation amplifier section 3 at a frequency of a commercial AC power supply, and the division circuit section 4 AC output unit 5 amplifies the AC power output from the power source with a vertical symmetrical switching frequency on the basis of the zero potential and outputs the final commercial AC power, and receives the signal output from the oscillation amplifier 3. This signal is used to perform pulse width modulation (PWM) control for stabilization of the output power and to perform alarm and buzzer driving, and to detect heat generated during operation of the device and to measure the detected heat as a reference value. When the reference value is exceeded, the heat detection unit 7 stops the operation of the device and performs alarm control, and when the excessive heat generation is detected by the heat detection unit 7, the buzzer receives this signal. Direct current (DC) / AC (AC) converter consisting of an alarm circuit unit for performing an alarm (8).