KR100421866B1 - Apparatus for controlling switching circuit of electronic equipment - Google Patents

Abstract

An apparatus for controlling a switching circuit of an electronic device, the electronic device having a transformer having a voltage generator and a plurality of primary coils in parallel, the electronic device having a voltage generated by the voltage generator at a predetermined period of A voltage sensing unit for outputting a predetermined voltage corresponding to the magnitude change, a switching circuit unit for switching a plurality of primary coils of the transformer as a switching unit is connected to the primary coil of the transformer, and a predetermined signal is input; A current detector which detects a current generated by each switching unit of the switching circuit unit and converts it into a voltage, a maximum value selecting unit for selecting a voltage having the highest value by receiving a predetermined voltage converted by the current detection unit, and an output voltage of the voltage sensing unit Is inputted to generate a pulse having a predetermined width, and the voltage selected by the maximum value selector When a voltage equal to or higher than the set reference value is transmitted from the maximum value selector, the pulse generator stops generating pulses, and the pulse generated by the pulse generator is switched according to whether the output voltage of the voltage detector is input to apply a predetermined signal to the switching circuit. Since it includes a driving unit, the switching circuit unit includes a plurality of switching units to operate the switching unit according to the change in the size of the input voltage (V _I ) to maximize the output power, the usable range of the input voltage (V _I ) Can be enlarged.

Description

Apparatus for controlling switching circuit of electronic equipment

The present invention relates to an electronic device, and more particularly, to a switching circuit control apparatus of the electronic device.

Hereinafter, a switching circuit control apparatus for an electronic apparatus according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram showing a configuration of a switching circuit control apparatus of an electronic apparatus according to the prior art.

As shown in FIG. 1, the switching circuit control apparatus of the electronic apparatus according to the related art converts a voltage generated by the voltage generator 10 and the voltage generated by the voltage generator 10 into a predetermined DC voltage and supplies it to a power source. And a transformer 15 for receiving the voltage generated by the voltage generator 10 to the primary side and inducing a predetermined voltage to the secondary side in proportion to the number of windings of the secondary side; An output rectifier 16 for rectifying and smoothing the voltage induced on the secondary side of the transformer 15 to output a DC voltage of a predetermined level, and a voltage feedback unit 17 for feeding back the voltage output from the output rectifier 16. And a switching unit 13 which is driven as a predetermined signal is input to switch the voltage input to the primary side of the transformer 15 to the secondary side, and detects a current appearing in the switching element of the switching unit 13. To the detected current A current detector 14 for outputting a corresponding voltage and a pulse having a width corresponding to a voltage fed back through the voltage feedback unit 17 to operate as a voltage is supplied from the power supply unit 11. And a pulse generating unit 12 and a snubber circuit unit 18 for transmitting a pulse to the switching unit and blocking a pulse transmitted to the switching unit 13 according to the output voltage level of the current detector 14. It is composed.

Referring to the operation of the switching circuit control device of the electronic apparatus according to the prior art configured as described above are as follows.

First, the voltage generator 10 generates a predetermined voltage V _I and transmits it to the power supply unit 11 and the transformer 15.

Subsequently, the power supply unit 11 receives the voltage V _I generated by the voltage generator 10, converts the voltage into a voltage for operating the pulse generator 12, and transmits the voltage to the pulse generator 12. .

The pulse generator 12 generates a V _G signal having a predetermined pulse width and transmits the generated V _G signal to the switching unit 13.

The transformer 15 receives the voltage V _I generated by the voltage generator 10 to the primary side and induces a predetermined voltage to the secondary side in proportion to the number of windings of the secondary side coil.

In this case, the switching unit 13 is driven as the V _G signal transmitted from the pulse generator 12 is input so that the voltage input to the primary side of the transformer 15 is proportional to the number of turns of the secondary coil. The transformer 15 is switched to be induced to the secondary side.

Here, the snubber circuit unit 18 absorbs a surge voltage generated by the leakage inductance of the transformer 15 when the switching unit 13 is driven, thereby applying excessive voltage to the switching unit 13. prevent.

Subsequently, the current detector 14 detects and converts a current flowing through the switching element of the switching unit 13 into a voltage according to the driving of the switching unit 13, and filters the converted voltage to filter the pulse generator 12. To send.

At this time, the pulse generator 12 determines that excessive current flows to the switching element of the switching unit 13 when the V _C signal transmitted from the current detector 14 becomes equal to or greater than a predetermined voltage value. The generation of the V _G signal applied to the switching unit 13 is stopped in order to prevent damage.

Subsequently, the switching unit 13 stops driving because no V _G signal is applied from the pulse generator 12.

The output rectifier 16 rectifies and smoothes the voltage induced on the secondary side of the transformer 15 to convert the DC voltage V ₀ to a predetermined level.

At this time, the voltage feedback unit 17 detects the DC voltage V ₀ converted by the output rectifier 16 and feeds it back to the pulse generator 12.

Subsequently, the pulse generator 12 adjusts the pulse width of the V _G signal applied to the switching unit 13 according to a signal fed back by the voltage feedback unit 17 to the switching unit 13. send.

Switching circuit control device of an electronic apparatus according to the prior art described above is restricted to the use of a variable input voltage (V _I) by using a switching unit and a current detection unit consisting of a single switching element Furthermore, the variable input voltage (V _I) There is a problem that the maximum power consumption is limited due to usage restrictions.

Therefore, the present invention has been made to solve the above problems, by providing a switching circuit portion consisting of a plurality of switching unit to maximize the output power by operating the corresponding switching unit according to the change in the size of the input voltage (V _I ). It is an object of the present invention to provide a switching circuit control device for an electronic device.

1 is a block diagram showing a configuration of a switching circuit control apparatus of an electronic apparatus according to the prior art

Figure 2 is a block diagram showing the configuration of a switching circuit control device of an electronic device according to the present invention

3 is a circuit diagram illustrating in detail a voltage sensing unit illustrated in FIG. 2.

4 is a circuit diagram showing in detail the driving unit shown in FIG.

FIG. 5 is a circuit diagram illustrating in detail a snubber circuit unit, a transformer, a switching circuit unit, a current detector, and a maximum value selector illustrated in FIG.

FIG. 6 is a circuit diagram illustrating in detail a voltage feedback unit illustrated in FIG. 2.

FIG. 7 is a waveform diagram illustrating output signals of respective units shown in FIG. 2.

* Explanation of symbols for main parts of the drawings

100: voltage generator 110: voltage detector

120: drive unit 130: pulse generator

140: transformer 150: switching circuit

160: current detector 170: maximum value selector

180: output rectifier 190: voltage feedback

In accordance with another aspect of the present invention, a switching circuit control apparatus for an electronic device includes a voltage generator and an electronic device having a transformer configured with a plurality of primary coils in parallel. A voltage sensing unit for outputting a predetermined voltage corresponding to a change in the magnitude of the sensed voltage by sensing at a predetermined period, and a switching unit is connected to the primary coil of the transformer, respectively, so that a plurality of primary coils of the transformer are input. A switching circuit unit for switching a circuit, a current detector for detecting and converting a current generated from each switching unit of the switching circuit unit into a voltage, and a maximum value for selecting a voltage having the highest value by receiving a predetermined voltage converted by the current detector. Unit and the voltage sensing unit's output voltage are operated to generate a pulse having a predetermined width, and select the maximum value. The switching circuit unit switches the pulse generated by the pulse generator according to whether or not the output voltage is inputted by the pulse generator that stops the pulse generation when the voltage selected by the reference value is set as the reference value and is transmitted from the maximum selector. It is characterized by including a driver for applying a predetermined signal to the.

Hereinafter, a switching circuit control apparatus for an electronic device according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing a configuration of a switching circuit control apparatus of an electronic device according to the present invention, FIG. 3 is a circuit diagram showing in detail a voltage sensing unit shown in FIG. 2, and FIG. 4 is a detailed view of a driving unit shown in FIG. 5 is a detailed circuit diagram of the snubber circuit unit, a transformer, a switching circuit unit, a current detection unit, and a maximum value selecting unit shown in FIG. 2, and FIG. 6 is a circuit diagram showing the voltage feedback unit shown in FIG. 2 in detail. FIG. 7 is a waveform diagram illustrating output signals of respective units illustrated in FIG. 2.

As shown in FIG. 2, the switching circuit control apparatus for an electronic device according to the present invention includes a voltage generator 100 and an electronic device having a transformer 140, the voltage generated by the voltage generator 100. And a voltage sensing unit 110 for outputting a predetermined voltage corresponding to a change in magnitude of the sensed voltage by a predetermined period, and driven as a predetermined signal is input to at least one switching unit for switching the transformer 140. The switching circuit unit 150, the current detection unit 160 for detecting and converting a current generated by each switching unit of the switching circuit unit 150 to a voltage, and receives a predetermined voltage converted by the current detection unit 160 A maximum value selecting unit 170 for selecting a voltage having the highest value and an output voltage of the voltage detecting unit 110 are operated to generate a pulse having a predetermined width, and the maximum value selecting unit A pulse generator 130 for stopping the generation of the pulse when the voltage higher than the reference value set by setting the voltage selected at 170 as the reference value is transmitted from the maximum selector 170, and the output voltage of the voltage detector 110. The driving unit 120 is configured to switch a pulse generated by the pulse generator 130 according to whether the input is applied to apply a predetermined signal to the switching circuit unit 150.

And a snubber circuit unit 200 which absorbs a surge voltage generated by the transformer 140 and prevents excessive voltage from being applied to the corresponding switching unit when a predetermined switching unit of the switching circuit unit 150 operates. The output rectifying unit 180 rectifies and smoothes the voltage output from the 140 to generate a DC voltage of a predetermined level, and the output voltage of the output rectifying unit 180 is adjusted so that the pulse width of the pulse generating unit 130 is adjusted. It further comprises a voltage feedback unit 190 for detecting and returning to the pulse generator 130.

In this case, the switching units 150a ₁ to 150a _n of the switching circuit unit 150 are composed of respective transistors Q _150a1 to Q _150an .

Subsequently, the voltage detecting unit 110 senses the voltage generated by the voltage generating unit 100 at a predetermined period and at least two or more voltage dividers R _V and R ₁ to R _n for dividing the detected voltage. At least one of receiving the voltage divided by the divided resistors R _V and R ₁ to R _n as a non-inverting (+) terminal and outputting a predetermined voltage through a comparison result with a reference voltage input to the inverting (-) terminal. Comparators 110a ₁ to 110a _{n of} the configuration is included.

The driver 120 includes at least one switching element 120a ₁ to 120a _n for switching a pulse generated by the pulse generator 130 according to whether the voltage sensing unit 110 outputs an output voltage. do.

Referring to the operation of the switching circuit control device of the electronic device according to the present invention configured as described above in detail.

First, the voltage generator 100 generates a predetermined voltage V _I and transmits it to the voltage detector 110 and the transformer 140, respectively.

Subsequently, the voltage detector 110 generates a predetermined voltage V ₀ n (Vs _n ) corresponding to a change in the magnitude of the voltage V _I generated by the voltage generator 100 to generate a pulse generator 130. And transmission to the driving unit 120, respectively.

That is, as shown in FIG. 3, the voltage sensing unit 110 receives the voltage V _I generated by the voltage generating unit 100 and connects the divided resistors R _V and R ₁ to R _n connected in parallel. By dividing through, the first to nth divided voltages V ₁ to V _n are generated.

Subsequently, the first to n th comparators 110a ₁ to 110a _{n of} the voltage sensing unit 110 are divided by the voltage dividing resistors R _V and R ₁ to R _n to generate the first to n th divided voltages ( V ₁ ~ V _n ) is input to the non-inverting (+) terminal and outputs V ₀ n and Vs ₁ ~ Vs _n signals according to the comparison result with the reference voltage (Vref) input to each inverting (-) terminal. Transmission to the pulse generator 130 and the driver 120, respectively.

That is, when the magnitude of the voltage V _I generated by the voltage generator 100 is changed as shown in ⓐ of FIG. 7, first, the voltage detector 110 measures the voltage V at the time point T _{1. I} ) detects and divides the voltage through the voltage dividing resistors R _V and R ₁ to R _n , and compares the first to nth divided voltages V ₁ to V _n generated by the partial pressure to the first to nth comparators ( 110a ₁ ~ 110a _n ) is applied to the non-inverting (+) terminal respectively.

In this case, since the first divided voltage V ₁ applied to the non-inverting (+) terminal of the first comparator 110a ₁ is greater than a reference voltage Vref input to the corresponding inverting (-) terminal, the predetermined voltage is higher than the reference voltage Vref. The first comparator 110a ₁ generates a V ₀ n signal as shown in ⓔ of FIG. 7 and transmits the generated signal to the pulse generator 130 according to the comparison operation result.

On the other hand, the second to n-th divided voltages (V ₂ to V _n ) applied to the non-inverting (+) terminals of the second to n-th comparators 110a ₂ to 110a _n at the time T ₁ are respectively inverted ( -), since the predetermined level is less than the reference voltage (Vref) is applied to the terminal and the second to n-th comparator (110a ₂ ~ 110a _n) is ⓑ of Fig. 7 with respect to the T ₁ time, ⓒ, '0' level as shown in ⓓ Outputs Vs ₁ to Vs _n signals.

In addition, the voltage detector 110 detects the voltage V _I generated by the voltage generator 100 at the time T ₂ , and divides the voltage through the voltage divider resistors Rv and R ₁ to R _n . The first to n th divided voltages V ₁ to V _n generated due to the non-inverting (+) terminals of the first to n th comparators 110a ₁ to 110a _n are respectively applied.

In this case, only the first and second divided voltages V ₁ and V ₂ input to the non-inverting (+) terminals of the first and second comparators 110a ₁ and 110a ₂ , respectively, are inverted (−) terminals. Since the first and second comparators 110a ₁ and 110a ₂ are equal to or greater than the reference voltage Vref inputted to the V ₀ n signal as shown in FIG. 7 and Vs as shown in ⓑ of FIG. generating a _first signal respectively, it will be sent to each of the pulse generating unit 130 and the driver 120.

The third to nth divided voltages V ₃ to V _n applied to the non-inverting (+) terminals of the third to n th comparators 110a ₃ to 110a _n at the time T ₂ are respectively inverted (−). ) terminal, since a predetermined level is less than the reference voltage (Vref) and the third to n-th comparator is applied to the (110a ₃ ~ 110a _n) is the "0" level as shown in ⓒ and ⓓ of Fig. 7 for a T ₂ time Vs ₂ and it outputs a signal _n ~ Vs.

Similarly, the voltage detector 110 detects the voltage V _I generated by the voltage generator 100 even at a time point T ₃ to T _n and according to the detected voltage V _I. The first to n th comparators 110a ₁ to 110a _n of the 110 are operated to output a Vs ₁ to Vs _n signal corresponding to the voltage V _I.

Subsequently, the pulse generator 130 operates by receiving a predetermined signal V ₀ n outputted from the voltage detector 110 to generate a V _G signal as shown in FIG. 7 and transmit it to the driver 120. do.

In addition, the driving unit 120 switches the V _G signal generated by the pulse generator 130 as the Vs ₁ to Vs _n signals are transmitted from the voltage sensing unit 110. The V _G1 to V _Gn signals for driving the _n th switching units 150a ₁ to 150a _n are output.

That is, as shown in FIG. 4, the first to n th switching elements 120a ₁ to 120a _n of the driving unit 120 are the second to n th comparators 110a ₂ to 110a of the voltage sensing unit 110. _n ) outputs V _G1 to V _Gn signals as shown in ⓖ to ⓘ of FIG. 7 by switching the V _G signals generated by the pulse generator 130 as the Vs ₁ to Vs _n signals output from the _n ) are transmitted. do.

For example, since the Vs ₁ signal is not transmitted from the voltage sensing unit 110 at the time T ₁ , the first switching device 120a ₁ of the driving unit 120 is turned on and is turned on in the pulse generating unit 130. and switch the V _G signal that is generated, T ₂ point, since the Vs ₁ signal from the voltage detecting unit 110, the transmission is turned off (off) the V _G1 signal, such as ⓖ of Fig. 7 does not switching the V _G signal Output

Similarly, the second to n th switching elements 120a ₂ to 120a _n of the driving unit 120 also operate in the same manner as the first switching element 120a ₁ to output the V _G2 to V _Gn signals.

As a result, the first to n th comparators 110a ₁ to 110a _{n of} the voltage sensing unit 110 are operated according to the magnitude change of the voltage V _I generated from the voltage generator 100 to operate Vs ₁ to Vs. _{The n} signal is output, and the driving unit 120 transmits a signal for driving the predetermined switching unit of the switching circuit unit 150 according to whether the Vs ₁ to Vs _n signals are input and drives the corresponding switching unit.

That is, it can be seen that the switching unit of the switching circuit unit 150 corresponding to the size change of the voltage V _I generated by the voltage generator 100 is driven. The switching circuit unit includes at least one switching unit. By using 150 it can be seen that the usable range of voltage V _I is expanded.

Subsequently, the transformer 140 receives the voltage V _I generated from the voltage generator 100 to the primary side and induces a predetermined voltage to the secondary side in proportion to the number of windings of the secondary side coil.

In this case, as shown in FIG. 5, the first to n th switching units 150a ₁ to 150a _{n of} the switching circuit unit 150 receive the V _G1 to V _Gn signals output from the driving unit 120, respectively. By driving, the voltages respectively input to the primary coils N _P1 to N _Pn of the transformer 140 are switched so as to be induced to the corresponding secondary side in proportion to the number of turns of the secondary coil N _S.

That is, the first transistor Q _150a1 of the first switching unit 150a ₁ is turned on by receiving a V _G1 signal output from the driving unit 120 as a gate and is turned on as the primary side of the transformer 140. The voltage applied to the first coil N _P1 is accumulated, and when turned off, the voltage accumulated in the first coil N _P1 is switched to be induced to the secondary side.

In addition, each of the transistors Q _150a2 to Q _{150an of} the second to nth switching units 150a ₂ to 150a _n performs the same operation as that of the first transistor Q _150a1 .

In this case, the snubber circuit unit 200 absorbs a surge voltage generated by the leakage inductance of the transformer 140 when each of the switching units 150a ₁ to 150a _n of the switching circuit unit 150 operates. An excessive voltage is prevented from being applied to each of the transistors Q _150a1 to Q _{150an of the} first to nth switching units 150a ₁ to 150a _n .

Subsequently, the current detector 160 detects a current flowing through each of the transistors Q _150a1 to Q _150an of the first to nth switching units 150a ₁ to 150a _n of the switching circuit unit 150 to detect n resistors R _160a1. ~ R _160an ) to generate the voltage V _C1 to V _Cn .

The maximum value selector 170 receives the V _C1 to V _Cn voltages generated by the current detector 160, selects the maximum voltage V _C among the input voltages, and transmits the maximum voltage V _C to the pulse generator 130. .

In this case, the pulse generator 130 sets the maximum voltage V _C transmitted from the maximum value selector 170 as a reference value, and when a voltage equal to or greater than a reference value set is transmitted from the maximum value selector 170, the switching circuit unit. When the current flowing through each of the switching units 150a ₁ to 150a _n of the 150 is detected excessively, the output of the V _G signal to the driving unit 120 is stopped to stop the switching circuit unit 150.

The output rectifier 180 rectifies and smoothes the voltage induced on the secondary side of the transformer 140 to output a DC voltage V ₀ of a predetermined level.

Subsequently, the voltage feedback unit 190 detects a DC voltage V ₀ of a predetermined level output from the output rectifying unit 180 and feeds it back to the pulse generator 130.

That is, as shown in FIG. 6, the light emitting diode D _190a1 of the voltage feedback unit 190 receives the DC voltage V ₀ output from the output rectifying unit 180 through the first resistor R _190a1 . receiving input to the anode, parallel-connected third and fourth resistors (R _190a3) (R _190a4) to the voltage of the diode (D _190a2) for receiving by receiving the cathode converts the difference between the two voltages inputted to the signal through the partial pressure by Transfer to transistor Q _190a .

Subsequently, the light receiving transistor Q _190a outputs the reference voltage Vref of the collector stage to the emitter stage as the signal transmitted from the light emitting diode D _190a1 is input to the base, and the voltage output to the emitter stage. through the parallel-connected fifth and sixth resistors (R _190a5) (R _190a6) the partial pressure will be transmitted to the pulse generation section 130. the

Here, the pulse generator 130 adjusts the pulse width, that is, duty ratio, of the V _G signal output to the driver 120 according to the signal fed back by the voltage feedback unit 190 and outputs the adjusted ratio.

The present invention is the use of the voltage (V _I) by switching parts of the operation of the switching circuit 150 in response to the size variation of a voltage (V _I) generated by the voltage generating unit 100 corresponding thereto, as described above The range can be extended and the output power can be maximized.

The switching circuit control apparatus of the electronic device according to the present invention as described above has a switching circuit portion composed of a plurality of switching portions to maximize the output power by operating the switching unit in accordance with the change in the size of the input voltage (V _I ). In addition, there is an effect that can extend the usable range of the input voltage (V _I ).

Claims (5)

In an electronic device having a transformer in which a voltage generator and a plurality of primary coils are configured in parallel, A voltage sensing unit for sensing a voltage generated by the voltage generating unit at a predetermined period and outputting a predetermined voltage corresponding to a change in magnitude of the sensed voltage; A switching circuit unit for switching a plurality of primary coils of the transformer as switching units are respectively connected to the primary coils of the transformer and a predetermined signal is input; A current detector for detecting a current generated by each switching unit of the switching circuit unit and converting the current into a voltage; A maximum value selector configured to receive a predetermined voltage converted by the current detector and select a voltage having the highest value; The output voltage of the voltage sensing unit is operated to generate a pulse having a predetermined width, and when the voltage selected by the maximum value selecting unit is set as a reference value and the voltage higher than the set reference value is transmitted from the maximum value selecting unit, the pulse generation is stopped. A pulse generator; And a driving unit for switching a pulse generated by the pulse generator to apply a predetermined signal to the switching circuit according to whether the output voltage is input to the voltage sensing unit. The method of claim 1, A snubber circuit unit which absorbs a surge voltage generated by the transformer during operation of the predetermined switching unit of the switching circuit unit and prevents excessive voltage from being applied to the switching unit; An output rectifier for rectifying and smoothing the voltage output from the transformer to generate a DC voltage having a predetermined level; And a voltage feedback unit for detecting an output voltage of the output rectifying unit and returning it to the pulse generating unit so that the pulse width of the pulse generating unit is adjusted. The method of claim 1, Switching circuit control device of the electronic device, characterized in that the switching unit of the switching circuit portion is composed of a transistor. The method of claim 1, At least two voltage divider resistors for dividing the detected voltage by sensing the voltage generated by the voltage generator at a predetermined period; And at least one comparator configured to receive the voltage divided by the voltage divider into a non-inverting terminal and output a predetermined voltage through a comparison result with a reference voltage input to an inverting terminal. Control unit. The method of claim 1, And the driving unit comprises at least one switching element for switching the pulses generated by the pulse generating unit according to whether the output voltage is input to the voltage sensing unit.