KR20010054188A - Power supply using constant on-time control method - Google Patents

Abstract

PURPOSE: A power supply apparatus using regular driving time control method is provided to make non-continuous operation mode possible by adding compensation slope to comparison of inductor current and control input. CONSTITUTION: The first comparing part(100) is supplied with diode current, control signal and the signal which compensation signal is added to and outputs high signal when the compensation signal added to the control signal is higher than the diode current. The monostable multivibrator(200) outputs trigger pulse upon input of the high signal. The first switching part(300) operates switching upon input of the trigger pulse. The first second capacitor(400,800) discharge the charged voltage by the switching operation of the first and second switching part(300,700). The power supply part(900) generates reference voltage by the discharge of the second capacitor(700).

Description

Power supply using constant drive time control method {POWER SUPPLY USING CONSTANT ON-TIME CONTROL METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply, and in particular, a power supply using a constant driving time control method for improving controllability of a power supply device by adding a compensation slope to enable operation in a continuous conduction mode and a discontinuous conduction mode. Relates to a device.

As is well known, the power supply device using the constant driving time control method of the present invention has a higher sensitivity to a voice signal than the conventional CIC (Current Injected Control) method, but it is not widely used because a PWM IC is not yet provided, but there is a possibility in the future. It presents a method for a power supply that operates in both continuous and discontinuous conduction modes.

In the conventional method, when one switching cycle starts unconditionally, the power device is forcibly turned off after a certain time after turning on the power device. At this time, the inductor current is decreased, and the reduced inductor current is output signal of the voltage feedback loop. Compared with the power supply, the power device is turned on again to start one switching cycle again, and thus the operation of the discontinuous conduction mode cannot be performed.

Accordingly, the present invention is to solve the above-mentioned conventional problems, and the object of the present invention is not to compare the inductor current and the control input alone, but by adding a compensation slope, a constant driving time that enables discontinuous operation mode. It is to provide a power supply using a control method.

In order to achieve the above object, in the power supply apparatus using the constant driving time control method of the present invention, the input diode current and the control signal and the slope compensation signal are added to receive the control signal and the slope compensation signal added to the diode current. A first comparator for outputting a set signal if large; A monostable multivibrator configured to receive a setting signal generated by the first comparator and generate a trigger pulse; A first switching unit configured to switch by a trigger pulse generated by the monostable multivibrator; A first capacitor discharging a voltage charged by the on of the first switching unit; An ora gate for receiving and transmitting a setting signal generated by the first comparator; A de-flip-flop that receives a signal transmitted through the OR gate and serves as a toggle switch; A first switching unit switched on / off by the output of the de-flip flop; A second capacitor which discharges the voltage charged by the on operation of the second switching unit; A power supply unit applying a reference voltage by the discharge of the second capacitor; And a second comparing unit which applies a setting signal by the power supply unit.

1 is a block diagram showing a power supply using a constant driving time control method according to an embodiment of the present invention;

2 is a view showing the generation of a switching signal in a power supply using a constant driving time control method according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: first comparator 200: monostable multivibrator

300: first switching unit 400: first capacitor

500: Ora gate 600: De-flip flop

700: second switching unit 800: second capacitor

900 power supply unit 1000 second comparison unit

Hereinafter, a power supply apparatus using a constant driving time control method of the present invention according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram illustrating a power supply device using a constant driving time control method, and FIG. 2 is a diagram illustrating a switching signal generation of the power supply device using the constant driving time control method.

As shown in FIG. 1, the first comparator 100 receives a signal in which a diode current, a control signal, and a slope compensation signal are added, and the slope compensation signal added to the control signal is greater than the diode current. If large, it serves to output high signal.

In addition, the monostable multivibrator 200 receives a high signal generated from the first comparator 100 to generate a trigger pulse, and the first switching unit 300 performs the monostable multivibrator ( The switching operation is performed by the trigger pulse generated from 200, and the first capacitor 400 plays a role of discharging the voltage charged by the on of the first switching unit 300.

Subsequently, the OR gate 500 serves to receive and transmit a high signal generated from the first comparator 100, and the de-flip flop 600 transmits the signal transmitted through the OR gate 500. Receives and serves as a toggle switch, the second switching unit 700 serves to switch on / off by the signal output from the de-flip flop (600).

On the other hand, the second capacitor 800 serves to discharge the voltage charged by the on operation of the second switching unit 700, the power source 900 is a reference by the discharge of the second capacitor (800). A voltage is applied, and the second comparator 1000 serves to apply a low signal by the power supply unit 900.

Hereinafter, an operation process of the power supply apparatus using the constant driving time control scheme configured as described above will be described.

As shown in FIG. 2, the first comparator 100 receives a signal obtained by adding a diode current, a control signal, and a slope compensation signal to the internal circuit of the power supply device from the outside, and the slope compensation signal added to the control signal. Is greater than the diode current, it outputs a set signal, for example a high signal.

Then, the monostable multivibrator 200 receives the high signal generated from the first comparator 100 and outputs a trigger pulse, and the first switching unit 300 receives the monostable multivibrator 200 from the monostable multivibrator 200. Switching operation is performed by receiving the generated trigger pulse, and the first capacitor 400 discharges the voltage that has been charged by the on-switching operation of the first switching unit 300 as the slope compensation signal shown in FIG. 1 is input as the slope compensation signal of the comparator 100.

In this case, when the ora gate 500 receives and transmits the high signal transmitted from the first comparator 100 as shown in A of FIG. 2, the ora gate 500 is de-flip-flop 600. After receiving the high signal transmitted through a) outputs a high signal through the output Q, the high signal is not shown in the rear switch is turned on to apply the power generated from the power supply to an external device.

In addition, the de-flip flop 600 The high signal input through the OR gate 500 is output as a low signal at the second switching unit 700 of the de-flip-flop 600 The switching operation is received by receiving the low signal transmitted from the second capacitor, and the second capacitor 800 discharges all the voltages charged by the on of the second switching unit 700.

At this time, the power supply unit 900 applies the reference voltage by the discharge of the second capacitor 800, and the setting signal, for example, by the reference voltage applied from the power supply unit 900 by the second comparator 1000 The low signal is output, and the low signal applied from the first comparator 100 and the low signal transmitted from the second comparator 1000 are transmitted from the OR gate 500.

Then, the de-flip-flop 600 receives and transmits a low signal transmitted from the OR gate 500, and is not shown at a rear end by the low signal transmitted from the de-flip-flop 600. The switch is off.

At this time, the de-flip flop 600 When the high signal is output and the second switching unit 700 contacts, and the second capacitor 800 discharges the voltage that has been charged by the contact of the second switching unit 700, the power supply unit ( In 900, the reference voltage is generated by the discharge of the second capacitor 800.

Subsequently, the second comparator 1000 transmits a high signal as shown in B of FIG. 2 by the reference voltage transmitted from the power source 900, and the second comparator at the ora gate 500. When the high signal transmitted from 1000 is received and transmitted, the de-flip-flop 600 outputs the high signal transmitted from the OR gate 500, so that a switching unit (not shown) of the rear stage is shown in FIG. As shown in C, it can be turned on to operate in continuous and discontinuous modes.

As described above, the power supply device using the constant drive time control method of the present invention continuously or discontinuously applies a voltage applied from the power supply device, thereby continuously supplying power regardless of the load of the device to which power is supplied. It can be effected.

Claims (1)

A first comparing unit which receives a signal in which the diode current, the control signal and the slope compensation signal are added, and outputs a setting signal when the control signal and the slope compensation signal added are larger than the diode current; A monostable multivibrator configured to receive a setting signal generated by the first comparator and generate a trigger pulse; A first switching unit configured to switch by a trigger pulse generated by the monostable multivibrator; A first capacitor discharging a voltage charged by the on of the first switching unit; An ora gate for receiving and transmitting a setting signal generated by the first comparator; A de-flip-flop that receives a signal transmitted through the OR gate and serves as a toggle switch; A first switching unit switched on / off by the output of the de-flip flop; A second capacitor which discharges the voltage charged by the on operation of the second switching unit; A power supply unit applying a reference voltage by the discharge of the second capacitor; And a second comparing unit configured to apply a setting signal by the power supply unit.