KR101776952B1 - Discharging circuit capable of detecting power off - Google Patents

Discharging circuit capable of detecting power off Download PDF

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KR101776952B1
KR101776952B1 KR1020150164674A KR20150164674A KR101776952B1 KR 101776952 B1 KR101776952 B1 KR 101776952B1 KR 1020150164674 A KR1020150164674 A KR 1020150164674A KR 20150164674 A KR20150164674 A KR 20150164674A KR 101776952 B1 KR101776952 B1 KR 101776952B1
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South Korea
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discharge
node
power supply
switch
unit
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KR1020150164674A
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Korean (ko)
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KR20170060338A (en
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이영수
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엘아이지넥스원 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M2001/322—

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

Discloses a power shutdown detection discharge circuit for large capacity power supplies. The present invention relates to a capacitor unit including a first node of a pair of power supply lines for supplying a power supply voltage and at least one smoothing capacitor connected in parallel with a load device connected between the second node, A discharge control unit having a discharge resistor connected between nodes and at least one switch and disconnecting a discharge resistor from at least one of the first and second nodes in response to a switch control signal; And generates a power supply signal having a voltage level proportional to a voltage level of the power supply voltage when the voltage level of the power supply signal is equal to or higher than a predetermined reference voltage level, And a determination unit.

Description

DISCHARGING CIRCUIT CAPABLE OF DETECTING POWER OFF BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a discharge circuit, and more particularly, to a discharge circuit for a large capacity power supply device that performs discharge by sensing whether a power supply voltage is shut off.

BACKGROUND ART An electric and electronic device is basically powered by a power source, and therefore, has a power supply. The power supply unit generally includes a capacitor so that power can be stably supplied to the load unit. The capacitor removes ac components such as noise from the power supply voltage output from the power supply to the load so that the smoothed voltage is applied.

However, since the capacitor is provided in the power supply device, there is a problem that even after the power supply is cut off, it may damage the user or the electronic device that is contacted by the power stored in the capacitor. Particularly, in the case of a large-capacity power supply device that supplies a large amount of power, since the capacity of the capacitor is also provided in a large capacity, the effect on users and electronic devices is very large.

In this case, a discharge resistor connected in parallel with the capacitor is provided so that power stored in the capacitor is consumed when the power is cut off. However, since the discharge resistance of a conventional power supply unit is always connected in parallel to the capacitor, it consumes power unnecessarily while the power supply is being supplied with power. That is, not only the efficiency of the power supply apparatus is lowered but also the problem of heat generation is caused.

Korean Registered Patent No. 10-1487054 (registered on January 21, 2015)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a discharge circuit for a large capacity power supply apparatus which can prevent unnecessary power consumption by detecting whether a power supply is cut off and allowing a current to flow through a discharge resistor when the power supply is cut off.

According to an aspect of the present invention, there is provided a discharge circuit including a first node of a pair of power supply lines for supplying a power supply voltage and at least one smoothing capacitor connected in parallel with a load device connected between the second node A capacitor portion; And at least one switch connected between the first node and the second node in parallel with the capacitor unit, and at least one switch connected in parallel with at least one of the first node and the second node in response to a switch control signal, A discharge control unit for interrupting the discharge; And a capacitor coupled between the first node and the second node in parallel with the capacitor to generate a power supply signal having a voltage level proportional to a voltage level of the power supply voltage, A power discrimination unit for outputting the switch control signal to the discharge control unit; .

Wherein the discharge control unit includes: a first switch unit connected between the first and second nodes, the first switch unit outputting a discharge control signal in response to the switch control signal; A discharge resistor connected at one end to the first node; And a second switch connected between the other node of the discharge resistor and the second node and responsive to the discharge control signal for electrically connecting the discharge resistor to the second node; And a control unit.

Wherein the first switch unit comprises: a pull-up resistor whose one end is connected to the first node; A first switch connected between the other node of the pull-up resistor and the second node, and being turned on or off in response to the switch control signal to output the discharge control signal to the second switch unit; And a control unit.

A second switch having one end connected to the other end of the discharge resistor unit and being turned on or off in response to the discharge control signal to output a discharge signal; A pull-down resistor connected between the other end of the second switch and the second node to pull down the voltage level of the discharge signal when the second switch is turned off; And a second switch connected in series with the second switch and the pull-down resistor in parallel between the second node and the second node of the discharge resistor section, and responsive to the discharge signal, electrically connecting the discharge resistor section and the second node A third switch; .

The first, second, and third switches may be bipolar junction transistors that receive the switch control signal, the discharge control signal, and the discharge signal as a base terminal, respectively.

The discharge resistor unit includes a plurality of discharge resistors connected in series between the first node and the second switch unit, and the discharge resistor groups are connected in series.

A power distributor for distributing the power supply voltage applied to the pair of power supply lines and distributing the power supply voltage in a predetermined ratio to output the power supply signal if the power supply voltage is a DC power supply voltage; And a discharge judgment unit receiving the power supply signal and generating the switch control signal and outputting the switch control signal to the discharge control unit when the voltage level of the power supply signal is equal to or higher than a predetermined reference voltage level; And a control unit.

Wherein the power distributing unit has two distribution resistances connected between the first and second nodes and outputs the power supply signal from a distribution node between the two distribution resistors.

Wherein the discharge discrimination unit comprises a zener diode which is connected at one end to the distribution node to receive the power supply signal and blocks the switch control signal when the voltage level of the power supply signal is lower than the reference voltage level; And a control unit.

A pull-down resistor connected between the Zener diode and the second node for adjusting a voltage level of the switch control signal output from the Zener diode; And a control unit.

Wherein the discharging circuit converts the DC power supply voltage to the power supply line pair when the power supply voltage is an AC power supply voltage, Wherein the power conversion unit is implemented as a three-phase full-wave rectifying bridge circuit that converts the three-phase alternating voltage into a direct current when the power source voltage is a three-phase alternating voltage.

Accordingly, the power shutdown detection and discharge circuit for the large capacity power supply of the present invention turns on or off the switch depending on whether the supplied power is turned off, thereby preventing a current path through the discharge resistor from being generated Thereby preventing unnecessary power dissipation and discharging the power stored in the smoothing capacitor by forming a discharge loop through the smoothing capacitor and the discharge resistor when the power is cut off. Further, it is configured to detect whether the voltage level of the power source is lowered below a predetermined reference voltage level, and to determine whether or not the power source is cut off according to the detection result, thereby performing a discharging operation before the power source is completely cut off, have.

1 is a circuit diagram showing a power shutdown detection discharge circuit according to an embodiment of the present invention.
2 is a circuit diagram showing an example of a power conversion unit for the power shutdown detection discharge circuit of FIG.
3 shows a simulation result of the discharge performance of the power shutdown detection discharge circuit of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in various different forms, and is not limited to the embodiments described. In order to clearly describe the present invention, parts that are not related to the description are omitted, and the same reference numerals in the drawings denote the same members.

Throughout the specification, when an element is referred to as "including" an element, it does not exclude other elements unless specifically stated to the contrary. The terms "part", "unit", "module", "block", and the like described in the specification mean units for processing at least one function or operation, And a combination of software.

1 is a circuit diagram showing a power shutdown detection discharge circuit according to an embodiment of the present invention.

Referring to FIG. 1, the power-off detection / discharge circuit of the present invention includes a capacitor unit 100, a power source determination unit 200, and a discharge control unit 300.

The capacitor unit 100 is connected between the power supply line pair PL1 and PL2 for supplying the power supply voltage PW to the load device and between the first node nd1 and the second node nd2 to form at least one smoothing capacitor C1 and C2 to control the AC component such as noise in the power supply voltage PW applied through the power supply line pair PL1 and PL2 so that the stable power supply voltage is transmitted to the load device (not shown). It is general that only one smoothing capacitor C1 or C2 is provided. However, in the present invention, for example, it is assumed that the discharge circuit is a discharge circuit for a large capacity power supply device such as 220 V three-phase AC power supply. Since the large capacity power supply device is configured to supply a large amount of current to the load device, The power supply voltage PW supplied to the load device can not be sufficiently smoothed by the capacitor alone. Also, in the case of a large-capacity capacitor, since it is large and expensive, in FIG. 1, two smoothing capacitors (C1, C2) are connected in parallel instead of one large-capacity capacitor. Although the two smoothing capacitors C1 and C2 are illustrated as being connected in parallel between the first and second nodes nd1 and nd2 in FIG. 1, the number of smoothing capacitors can be adjusted according to the amount of current to be supplied to the load device have.

The power detector 200 detects whether the power source voltage PW is normally applied or not and adjusts the voltage level of the switch control signal SCS according to the detection result and transmits the voltage level to the discharge controller 300.

The power discrimination unit 200 is connected between the first and second nodes nd1 and nd2 and distributes the voltage level of the power supply voltage PW applied through the power supply line pair PL1 and PL2 to generate the power supply signal PS And a discharge determination unit 220 receiving the power supply signal PS and outputting the switch control signal SCS according to the voltage level of the power supply signal PS.

The power input unit 210 includes two distribution resistors DR1 and DR2 connected in series between the first and second nodes nd1 and nd2 to distribute the level of the power supply voltage PW. The power supply signal PS is output from the distribution node nd3 between the two distribution resistors DR1 and DR2. Therefore, the voltage level of the power supply signal PS is controlled such that the voltage level of the power supply voltage PW is divided into a value PW * DR2 / (DR1 + DR2) divided by the resistance value ratio of the two distribution resistors DR1 and DR2 do. The power input unit 210 generates the power supply signal PS by dividing the power supply voltage PW when the power supply voltage PW of a high voltage is directly applied to the discharge determination unit 220. The discharge determination unit 220, This is because the circuit of the discharge control unit 300 may be damaged. That is, the power input unit 210 performs a function of dropping the power supply voltage PW, which is a high voltage, to a signal of a voltage level suitable for the discharge determination unit 220 and the discharge control unit 300 and outputting the signal.

Here, since the two distribution resistors DR1 and DR2 are also resistances connected between the power supply line pair PL1 and PL2, power is consumed while the power supply voltage PW is applied. That is, unnecessary power consumption may occur. However, since the distribution resistors DR1 and DR2 are merely resistances provided for voltage distribution, the distribution resistors DR1 and DR2 may be implemented to have a very large resistance value (for example, several hundreds of KΩ to several MΩ) DR2, the power consumption can be reduced to a negligible level.

1, the power supply input unit 210 includes two distribution resistors DR1 and DR2. However, in order to easily distribute the power supply voltage PW of high voltage, a plurality of distribution resistors It can be done.

1, the discharge determination unit 220 is implemented as a Zener diode (ZD) connected between the distribution node nd3 and the first switch SW1 of the discharge control unit 300, for example. 1, a zener diode ZD is a constant voltage diode that allows a signal to pass when a signal of a predetermined reference voltage (or breakdown voltage) level (for example, 10V) or more is applied thereto. The voltage level of the power supply signal PS is a reference voltage Level, the switch control signal SCS is output to the first switch SW1 of the discharge controller 300, while when the level is lower than the reference voltage level, the power supply signal PS is cut off.

1, a resistor ZPDR provided together with a Zener diode ZD in the discharge determination unit 220 is configured to pull down the voltage level of the switch control signal SCS when the power source signal PS is cut off from the Zener diode ZD And at the same time prevents the overcurrent and the overvoltage from being applied to the base terminal of the first switch SW1 implemented as a bipolar junction transistor.

1, the discharge discrimination unit 220 is implemented as a Zener diode ZD and a resistor ZPDR. However, it is also possible to use a switch control signal SCS corresponding to the voltage level of the power supply signal PS It may be implemented by a circuit. For example, the discharge determination unit 220 may be implemented as a comparator to which a reference voltage is applied.

The discharge control unit 300 is connected between the power supply line pair PL1 and PL2 in parallel with the capacitor unit 100 and generates a power supply voltage PW (PW) in response to a switch control signal SCS applied from the power supply determination unit 200, The power stored in at least one smoothing capacitor C1 and C2 of the capacitor unit 100 is discharged by consuming power when the power source voltage PW is cut off .

The discharging control unit 300 includes a discharging resistor unit 310 for consuming power stored in at least one smoothing capacitor C1 and C2 of the capacitor unit 100 and a discharging control signal DCS And a second switch unit 330 that forms or cuts off a discharge path between the discharge resistor unit 310 and the capacitor unit 100 in response to the discharge control signal DCS, Respectively.

The discharge resistor unit 310 is connected between the first node ND1 and the second switch unit 330 and includes at least one discharge resistor DCR1 to DCR4. The conventional discharge resistor is configured to directly consume power irrespective of whether the power supply voltage PW is normally applied or disconnected as the discharge resistor is directly connected between the first and second nodes ndl and nd2. DCR1 to DCR4 are configured to be electrically connected to the second node nd2 through the second switch unit 330. Therefore, when the second switch unit 330 is configured to consume power only when the discharge path is formed, do.

In the present invention, since the discharge circuit for the large capacity power supply is assumed, the capacitances of the smoothing capacitors C1 and C2 are also large. Therefore, the discharge resistor unit 310 may be implemented by only one discharge resistor. However, the discharge resistor unit 310 may include a plurality of discharge resistors DCR1 to DCR4 to easily consume power stored in the smoothing capacitors C1 and C2 of large capacity, To be dispersed and consumed. In order to smooth the power consumption, it is preferable to increase the amount of current passing through the discharge resistor unit 310. [ 1, a discharge resistor group including a plurality of discharge resistors (DCR1, DCR2), (DCR3, DCR4) connected in series between a first node (nd1) and a second switch unit (330) The discharge resistor groups are connected in parallel to each other so that the electric power can be dispersed and consumed as well as the electric current can flow easily. However, as an example, the connection structure of the plurality of discharge resistors of the discharge resistor unit 310 may be variously changed.

The first switch unit 320 includes a pull-up resistor PUR and a first switch SW1 connected in series between the first and second nodes nd1 and nd2.

The first switch SW1 is connected between the pull-up resistor PUR and the second node nd2, and is turned on or off in response to the switch control signal SCS. The first switch SW1 is turned on so that the pull-up resistor PUR is electrically connected to the first and second nodes nd1 and nd2 when the voltage level of the switch control signal SCS is equal to or greater than a preset threshold value.

1, an emitter terminal is connected to a pull-up resistor PUR, a collector terminal is connected to a second node nd2, and a switch control signal SCS is applied to a base terminal of the first switch SW1 It was implemented as a bipolar transistor.

The pull-up resistor PUR is connected between the first node ND1 and the first switch SW1 so that when the first switch SW1 is turned off in response to the switch control signal SCS, The voltage level of the discharge control signal DCS is pulled up through the discharge control node between the first switches SW1 and output.

The second switch unit 330 includes a third switch SW3 connected between the discharge resistor unit 310 and the second node nd2, a discharge resistor unit 310 and a second node nd2 A second switch SW2 and a pull-down resistor PDR which are connected in series between the first switch SW1 and the second switch SW2.

The second switch SW2 is connected between the discharge resistor unit 310 and the pull-down resistor PDR and is turned on or off in response to the discharge control signal DCS applied from the first switch unit 320. [ When the voltage level of the discharge control signal DCS is equal to or higher than a preset threshold value, the second switch SW2 is turned on to connect the pull-down resistor PDR to the discharge resistor unit 310 to generate a discharge path, And outputs a signal DS.

The pull-down resistor PDR is connected between the second switch SW2 and the second node ND2 so that the second switch SW2 is turned on when the second switch SW2 is turned off in response to the discharge control signal DCS. And the pull-down resistor (PDR), and outputs the pulled down voltage level of the discharge signal DS. However, when the second switch SW2 is turned on, the voltage of the power source voltage PW is changed according to the resistance value of the discharge resistor unit DCR1 to DCR4 and the resistance ratio of the pull- Thereby adjusting the voltage level of the discharge signal DS and outputting it.

The third switch SW3 is turned on or off in response to the discharge signal DS to electrically connect or disconnect the discharge resistor unit 310 and the second node nd2. When the third switch SW3 is turned on, the discharge resistor unit 310 and the second node nd2 are electrically connected to each other so that the plurality of discharge resistors DCR1 to DCR4 of the discharge resistor unit 310 are electrically connected to the capacitor unit 100 To be consumed quickly.

The provision of the second switch unit 330 with the two switches SW2 and SW3 ensures that the discharge path of the discharge resistor unit 310 can be blocked while the power supply voltage PW is normally applied , So that the power stored in the capacitor unit 100 can be quickly discharged when the power source voltage PW is cut off.

As shown in FIG. 1, the second switch SW2 has an emitter terminal connected to the discharge resistor unit 310, a collector terminal connected to the pull-down resistor PDR, a discharge control signal DCS connected to the base terminal, The third switch SW3 may be implemented as a bipolar transistor to which the emitter terminal is connected, the collector terminal is connected to the second node nd2, And a bipolar transistor that receives a differential signal DS.

2 is a circuit diagram showing an example of a power conversion unit for the power shutdown detection discharge circuit of FIG.

The electric shock prevention circuit shown in FIG. 1 has been described on the assumption that it is a DC power supply voltage applied through the power supply line pairs PL1 and PL2 supplied by the power supply voltage PW. This is because most of the load devices are configured to be driven by receiving the DC power supply voltage. However, since an actual commercial power supply typically uses an AC power supply voltage and in particular, the present invention has been described in consideration of a discharging circuit for a large capacity power supply, it is assumed that a power supply voltage applied from the outside is a three-phase AC power supply voltage.

Therefore, it is necessary to convert the external power applied with the three-phase AC power supply voltage into the DC power supply voltage PW applied to the power supply line pair PL1 and PL2. FIG. 2 shows a power conversion unit for converting a three-phase AC power source into a power source voltage PW corresponding to the power source line pair PL1 and PL2.

Referring to FIG. 2, the power converter includes a three-phase bridge rectifier (TBR), a filter capacitor FR, and a filter resistor FR.

The three-phase bridge rectifier (TBR) has three rectifier diode pairs connected in parallel between the power supply line pairs PL1 and PL2, and each of the rectifier diode pairs has two rectifier diodes connected in series. Each of the two rectifying diodes of each of the three rectifying diode pairs is connected in the direction of the first power source line PL1 from the second power source line PL2 and the power source of one phase of the three-phase AC power source is applied between the two rectifying diodes Respectively. Since the one-phase power source applied between the two rectifying diodes is an alternating current, the two rectifying diodes, which are directional rectifying elements, can be applied to the first power source line PL1 when the power source of one phase has a positive voltage level. Phase AC power source having a phase difference of 120 degrees, the three rectifying diode pairs alternately alternate with each other and the power source voltage is applied to the first power source line PL1 so that the power source voltage pair PW ).

Connected in series with a three-phase bridge rectifier (TBR) between the power supply line pair PL1 and PL2 and a filter capacitor FR connected in parallel with the three-phase bridge rectifier TBR between the power supply line pairs PL1 and PL2 The filter resistor FR removes the noise component from the power supply voltage PW applied to the power supply line pair PL1, PL2 in the three-phase bridge rectifier TBR so that a stable and smoothed power supply voltage PW is generated. Since the three-phase bridge rectifier (TBR) simply applies the power source of the phase having the positive voltage level in the three-phase AC power source to the first power source line PL1, a ripple occurs. This ripple is the noise that must be removed from the supply voltage PW, and the filter capacitor FR removes the noise component from the supply voltage PW. On the other hand, the filter resistor FR is provided to prevent noise from being re-introduced into the three-phase bridge rectifier (TBR) through the second power supply line PL2.

In FIG. 2, the three-phase AC power source is rectified and supplied to the power source line pair PL1 and PL2 as a DC power source voltage PW. When the input power source is a general AC power source, a three-phase bridge rectifier (TBR) Can be replaced by a bridge rectifier or the like.

3 shows a simulation result of the discharge performance of the power shutdown detection discharge circuit of the present invention.

3, when the power source voltage PW is normally applied, the discharge interruption detection circuit of the present invention completely discharges the discharge path through the plurality of discharge resistors DCR1 to DCR4 of the discharge resistor unit 310 C2 and the discharge resistors DCR1 to DCR4 to form the smoothing capacitors C1 and C2 when the power source voltage PW is cut off by blocking the smoothing capacitors C1 and C2. Thereby discharging the electric power stored in the battery. Further, the power source determining unit 200 may detect whether the voltage level of the power source voltage PW is lower than a predetermined reference voltage level and form a discharge loop before the power source voltage PW is completely cut off according to the detection result So that rapid discharging can be performed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (11)

A capacitor portion including a first node of a pair of power supply lines for supplying a power supply voltage and at least one smoothing capacitor connected in parallel with a load device connected between the second node and the second node;
And at least one switch connected between the first node and the second node in parallel with the capacitor unit, and at least one switch connected in parallel with at least one of the first node and the second node in response to a switch control signal, A discharge control unit for interrupting the discharge; And
A capacitor connected between the first node and the second node in parallel with the capacitor to generate a power supply signal having a voltage level proportional to a voltage level of the power supply voltage, A power discrimination unit for outputting the switch control signal to the discharge control unit; Lt; / RTI >
The discharge control unit
A first switch connected between the first node and the second node for outputting a discharge control signal in response to the switch control signal;
A discharge resistor connected at one end to the first node; And
A second switch connected between the other node of the discharging resistor and the second node and responsive to the discharging control signal for electrically connecting the discharging resistor to the second node; / RTI >
The first switch unit
A pull-up resistor whose one end is connected to the first node; And
A first switch connected between the other node of the pull-up resistor and the second node and being turned on or off in response to the switch control signal to output the discharge control signal to the second switch unit; Lt; / RTI >
The second switch unit
A second switch having one end connected to the other end of the discharge resistor and turned on or off in response to the discharge control signal to output a discharge signal;
A pull-down resistor connected between the other end of the second switch and the second node to pull down the voltage level of the discharge signal when the second switch is turned off; And
Connected between the second node and the second node in parallel with the second switch and the pull-down resistor connected in series, and electrically connected to the discharge resistor unit and the second node in response to the discharge signal A third switch; ≪ / RTI &
The discharge resistor
And a discharge resistor group including a plurality of discharge resistors connected in series between the first node and the second switch unit are connected in parallel to each other. delete delete delete 2. The apparatus of claim 1, wherein the first to third switches
Wherein the discharge control signal, the discharge control signal, and the discharge signal are implemented as a bipolar junction transistor that receives the switch control signal, the discharge control signal, and the discharge signal as a base terminal, respectively. delete 2. The apparatus of claim 1, wherein the power-
A power distributor configured to receive the power supply voltage applied to the pair of power supply lines and distribute the power supply voltage in a predetermined ratio to output the power supply signal if the power supply voltage is a DC power supply voltage; And
A discharge discrimination unit receiving the power supply signal and generating the switch control signal and outputting the switch control signal to the discharge control unit when the voltage level of the power supply signal is equal to or higher than a predetermined reference voltage level; And a discharging circuit for discharging the discharge. 8. The apparatus of claim 7, wherein the power distributor
And a second distribution resistor coupled between the first and second nodes and outputting the power supply signal from a distribution node between the two distribution resistors. The apparatus of claim 8, wherein the discharge determination unit
A zener diode which is connected to the distribution node to receive the power supply signal and blocks the switch control signal when the voltage level of the power supply signal is lower than the reference voltage level; And a discharge circuit for a large capacity power supply. The apparatus of claim 9, wherein the discharge determination unit
A pull-down resistor connected between the zener diode and the second node for adjusting a voltage level of the switch control signal output from the zener diode; Further comprising a second power supply for supplying the power to the second power supply. The plasma display apparatus according to claim 1, wherein the discharge circuit
A power conversion unit converting the power source voltage into a DC power source voltage and applying the DC power source voltage to the pair of power source lines when the power source voltage is an AC power source voltage; Further comprising:
Wherein the power conversion unit is implemented as a three-phase full-wave rectifying bridge circuit that converts the three-phase alternating voltage into a direct current when the power source voltage is a three-phase alternating voltage.
KR1020150164674A 2015-11-24 2015-11-24 Discharging circuit capable of detecting power off KR101776952B1 (en)

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Publication number Priority date Publication date Assignee Title
CN109194106B (en) * 2018-09-30 2024-03-19 杰华特微电子（张家港）有限公司 X capacitor discharging method, discharging circuit and switching circuit
KR102270047B1 (en) * 2019-09-30 2021-06-28 세메스 주식회사 Overhead hoist transport apparatus and method of controlling the same
CN113741261B (en) * 2021-08-27 2023-06-06 普源精电科技股份有限公司 Power-on and power-off control circuit and signal output device

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"Bipolar Transistor Amplifiers "University of Colorado Boulder, Physics 3330, Experiment #7.(2013)*

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