CN205622496U - Discharge circuit and ac energisation device - Google Patents

Discharge circuit and ac energisation device Download PDF

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Publication number
CN205622496U
CN205622496U CN201620267668.7U CN201620267668U CN205622496U CN 205622496 U CN205622496 U CN 205622496U CN 201620267668 U CN201620267668 U CN 201620267668U CN 205622496 U CN205622496 U CN 205622496U
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CN
China
Prior art keywords
power supply
resistance
alternating current
switching tube
diode
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CN201620267668.7U
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Chinese (zh)
Inventor
王智勇
王平
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合肥惠科金扬科技有限公司
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Priority to CN201620267668.7U priority Critical patent/CN205622496U/en
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Publication of CN205622496U publication Critical patent/CN205622496U/en

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Abstract

The utility model relates to a power management technique field provides a discharge circuit and ac energisation device. This discharge circuit opens the mobile core piece with alternating current power supply to be connected, including discharge cell and switch element, the switch element with discharge cell, alternating current power supply open the power foot of mobile core piece and high presser foot that alternating current power supply opened the mobile core piece is connected, the discharge cell is connected with the high presser foot that alternating current power supply opened the mobile core piece, after the power shuts down, switch unit control the discharge cell is opened, to connect in the big electric capacity that alternating current power supply opened on the high presser foot of mobile core piece discharges, and the voltage that makes its both ends is at the safe voltage within range, like this, has both guaranteed the stability of power strip, has avoided the untimely potential safety hazard of bringing of big capacitor discharge again. Simultaneously, reduced artifical exoelectric step, labour saving and time saving practices thrift the cost.

Description

A kind of discharge circuit and AC power supply device

Technical field

This utility model relates to technical field of power management, particularly relates to a kind of discharge circuit and Alternating Current Power Supply dress Put.

Background technology

At present, Power Management Design power topological structure between 10W-90W all uses inverse-excitation type (i.e. AC-DC) Realize concrete merit.Before 4-5, it is all to use DC (Direct that the chip of chip manufacturer design starts function Current, direct current) start, the sampling after bulky capacitor is the power supply being received chip by several hundreds of K resistance Foot, the shortcoming of this design is that power standby power consumption is between 0.25W-0.3W.Along with the development of power technology, The efficiency of power supply is required more and more higher by various countries, and subsequently, chip manufacturer releases and uses AC (Alternating Current, exchange) chip that starts, as it is shown in figure 1, directly from live wire AC-L or the zero line of alternating current AC-N meets resistance supply pin VCC or the high presser feet HV to AC bootrom of several hundreds of K, so Be equivalent on bulky capacitor EC1, just do not have fictitious load, power standby power can accomplish below 0.1W, meet Present generation power supplies Energy Efficiency Standard.

It is well known that, inverse-excitation type bulky capacitor be mainly used for energy storage, if power supply shutdown after, greatly electricity Holding and do not have fictitious load, it is relatively slow for going to discharge by itself capacitive load, it is demonstrated experimentally that power supply shutdown Rear placement 2-3 days, bulky capacitor has the voltage of about 100V, if now staff imprudence is encountered, can exist Shock hazard, if power panel has short circuit and aircraft bombing risk after encountering metallics.And at present bulky capacitor is put Electricity mainly by manually going electric discharge, if electric discharge is not in time, can affect the stability of power panel, and exist Potential safety hazard.

Utility model content

The purpose of this utility model is to provide a kind of discharge circuit and AC power supply device, it is intended to solve existing When technology uses AC bootrom, after bulky capacitor, there is no fictitious load, if bulky capacitor discharges not in time, can shadow The stability ringing power panel and the problem that there is potential safety hazard.

This utility model is achieved in that a kind of discharge circuit, with the supply pin of alternating current power supply bootrom Connecting with high presser feet, described discharge circuit includes:

First end is connected with the supply pin of described alternating current power supply bootrom, carries out the current-limiting resistance of current limliting;

It is connected with the high presser feet of described alternating current power supply bootrom, after power supply shuts down, to being connected to described friendship Bulky capacitor on the high presser feet of stream power initiation chip carries out the discharge cell discharged;

With described discharge cell, the second end of described current-limiting resistance and the power supply of described alternating current power supply bootrom Foot connects, and after power supply shuts down, controls the switch element that described discharge cell is opened.

Further, described discharge cell includes the 6th resistance, the 7th resistance, the 8th resistance and the first switch Pipe;

The control of described first switching tube terminates described switch element, and the control end of described first switching tube is the most logical Cross described 6th resistance eutral grounding, the cold end ground connection of described first switching tube, described 7th resistance and described 8th resistance is serially connected with high presser feet and the hot end of described first switching tube of described alternating current power supply bootrom Between.

Further, described switch element includes that the 3rd diode, the 3rd resistance, the 4th resistance and second are opened Guan Guan;

The hot end of described second switch pipe connects the second end of described current-limiting resistance and described first switch respectively The control end of pipe, the cold end ground connection of described second switch pipe, the control end of described second switch pipe passes through Described 3rd resistance connects the negative electrode of described 3rd diode, and the control end of described second switch pipe is also by described 4th resistance eutral grounding, the anode of described 3rd diode connects the supply pin of described alternating current power supply bootrom.

Further, described first switching tube uses NMOS tube, and the grid of described NMOS tube is described the The control end of one switching tube, the source electrode of described NMOS tube is the cold end of described first switching tube, described The hot end that drain electrode is described first switching tube of NMOS tube.

Further, described first switching tube uses NPN type triode, the base of described NPN type triode The control end of the most described first switching tube, the most described first switching tube of transmitting of described NPN type triode Cold end, the hot end of the most described first switching tube of current collection of described NPN type triode.

Further, described second switch pipe uses NMOS tube, and the grid of described NMOS tube is described the The control end of two switching tubes, the source electrode of described NMOS tube is the cold end of described second switch pipe, described The hot end that drain electrode is described second switch pipe of NMOS tube.

Further, described second switch pipe uses NPN type triode, the base of described NPN type triode The control end of the most described second switch pipe, the transmitting the most described second switch pipe of described NPN type triode Cold end, the hot end of the current collection the most described second switch pipe of described NPN type triode.

Another object of the present utility model also resides in a kind of AC power supply device of offer, starts including alternating current power supply Chip, described AC power supply device includes discharge circuit described above.

Further, described AC power supply device also includes: the first diode, the second diode, the first electricity Resistance, the second resistance, commutator, energy storage bulky capacitor, transformator and the first electric capacity;

The anode of described first diode and the anode of described second diode connect the live wire and zero of alternating current respectively Line, the negative electrode of described first diode and the negative electrode of described second diode connect altogether, described first resistance and institute State the second resistance be serially connected with the negative electrode of described first diode and described alternating current power supply bootrom high presser feet it Between, the first end of described commutator and the second end connect anode and second diode of described first diode respectively Anode, the negative pole of the anode of described energy storage bulky capacitor and the armature winding of described transformator is connected to described whole altogether 4th end of stream device, the negative electrode of described energy storage bulky capacitor and the 3rd end of described commutator are connected to ground altogether, described The positive pole of the secondary windings of transformator connects the supply pin of described alternating current power supply bootrom, and described alternating current power supply opens The supply pin of dynamic chip is by described first capacity earth.

In embodiment of the present utility model, described discharge circuit is connected with alternating current power supply bootrom, including Discharge cell and switch element, described switch element and described discharge cell, the electricity of alternating current power supply bootrom The high presser feet of source foot and alternating current power supply bootrom connects, described discharge cell and alternating current power supply bootrom High presser feet connects, and after power supply shuts down, described switch element controls described discharge cell and opens, to being connected to Bulky capacitor on the high presser feet of described alternating current power supply bootrom discharges so that it is the voltage at two ends is in safety In voltage range, so, both ensure that the stability of power panel, and turn avoid bulky capacitor electric discharge and carry not in time The potential safety hazard come.Meanwhile, decrease the step of manual discharge, time saving and energy saving, cost-effective.

Accompanying drawing explanation

Fig. 1 is the circuit structure diagram using AC starting chip in prior art;

The function structure chart of the discharge circuit that Fig. 2 provides for this utility model embodiment;

The circuit structure diagram of the discharge circuit that Fig. 3 provides for this utility model embodiment;

The circuit structure diagram of the AC power supply device that Fig. 4 provides for this utility model embodiment.

Detailed description of the invention

For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and This utility model is described in further detail by detailed description of the invention.Should be appreciated that tool described herein Body embodiment is used only for explaining this utility model, is not limited to this utility model.

Embodiment one:

This utility model first embodiment provides a kind of discharge circuit.

Fig. 2 shows the function structure chart of the discharge circuit that this utility model first embodiment provides.In order to just In explanation, illustrate only the part relevant to this utility model embodiment.

A kind of discharge circuit, is connected with the supply pin VCC of alternating current power supply bootrom U1 and high presser feet HV, Described discharge circuit includes:

First end is connected with the supply pin VCC of alternating current power supply bootrom U1, carries out the current-limiting resistance of current limliting R5;

It is connected with the high presser feet HV of alternating current power supply bootrom U1, after power supply shuts down, to being connected to power supply Energy storage bulky capacitor EC1 on the high presser feet HV of bootrom U1 carries out the discharge cell 101 discharged;

With discharge cell 101, second end of current-limiting resistance R5 and the supply pin VCC of power initiation chip U1 Connect, after power supply shuts down, control the switch element 102 that discharge cell 101 is opened.

In the present embodiment, the model of alternating current power supply bootrom U1 is OB5269B, naturally it is also possible to be Other alternating current power supply bootrom.

Fig. 3 shows the circuit structure diagram of the discharge circuit that this utility model embodiment provides.For the ease of saying Bright, illustrate only the part relevant to this utility model embodiment.

As an embodiment of the present utility model, discharge cell 101 include the 6th resistance R6, the 7th resistance R7, 8th resistance R8 and the first switching tube 10;

The control termination switch element 102 of the first switching tube 10, the control end of the first switching tube 10 is also by the Six resistance R6 ground connection, the cold end ground connection of the first switching tube 10, the 7th resistance R7 and the 8th resistance R8 It is serially connected with between the high presser feet HV of alternating current power supply bootrom U1 and the hot end of the first switching tube 10.

As an embodiment of the present utility model, the first switching tube 10 uses NMOS tube Q1, NMOS tube The grid of Q1 is the control end of the first switching tube 10, and the source electrode of NMOS tube Q1 is the first switching tube 10 Cold end, the drain electrode of NMOS tube Q1 is the hot end of the first switching tube 10.

As another embodiment of the present utility model, the first switching tube 10 can also use NPN type triode, The base stage of NPN type triode is the control end of the first switching tube 10, the transmitting of NPN type triode extremely The cold end of one switching tube 10, the hot end of the current collection of NPN type triode the extremely first switching tube 10.

As an embodiment of the present utility model, switch element 102 includes the 3rd diode D3, the 3rd resistance R3, the 4th resistance R4 and second switch pipe 20;

The hot end of second switch pipe 20 connects second end of current-limiting resistance R5 and the first switching tube 10 respectively Controlling end, the cold end ground connection of second switch pipe 20, the control end of second switch pipe 20 is by the 3rd electricity Resistance R3 connects the negative electrode of the 3rd diode D3, and the control end of second switch pipe 20 connects also by the 4th resistance R4 Ground, the anode of the 3rd diode D3 meets the supply pin VCC of alternating current power supply bootrom U1.

In embodiment of the present utility model, the 3rd diode D3 is used for rectification.

As an embodiment of the present utility model, second switch pipe 20 uses NPN type triode Q2, NPN The control end that base stage is second switch pipe 20 of type audion Q2, the transmitting of NPN type triode Q2 is extremely The cold end of second switch pipe 20, the height of the current collection of NPN type triode Q2 extremely second switch pipe 20 Potential end.

As another embodiment of the present utility model, second switch pipe 20 can also use NMOS tube, NMOS The grid of pipe is the control end of second switch pipe 20, and the source electrode of NMOS tube is the low electricity of second switch pipe 20 Position end, the hot end that drain electrode is second switch pipe 20 of NMOS tube.

Certainly, the first switching tube 10 and second switch pipe 20 can also use controllable silicon, switch chip etc., And Fig. 3 is only an exemplary plot of the present utility model.

Embodiment two:

Second embodiment of the present utility model provides a kind of AC power supply device.

Fig. 4 shows the circuit structure diagram of the AC power supply device that this utility model the second embodiment provides.For It is easy to explanation, illustrate only the part relevant to this utility model embodiment.

A kind of AC power supply device, including alternating current power supply bootrom U1, described AC power supply device also includes The supply pin VCC and high presser feet HV of discharge circuit, described discharge circuit and alternating current power supply bootrom U1 Connecting, described discharge circuit includes:

First end is connected with the supply pin VCC of alternating current power supply bootrom U1, carries out the current-limiting resistance of current limliting R5;

It is connected with the high presser feet HV of alternating current power supply bootrom U1, after power supply shuts down, to being connected to power supply Energy storage bulky capacitor EC1 on the high presser feet HV of bootrom U1 carries out the discharge cell 101 discharged;

With discharge cell 101, second end of current-limiting resistance R5 and the supply pin VCC of power initiation chip U1 Connect, after power supply shuts down, control the switch element 102 that discharge cell 101 is opened.

In the present embodiment, the model of alternating current power supply bootrom U1 is OB5269B, naturally it is also possible to be Other alternating current power supply bootrom.

As an embodiment of the present utility model, discharge cell 101 include the 6th resistance R6, the 7th resistance R7, 8th resistance R8 and the first switching tube 10;

The control termination switch element 102 of the first switching tube 10, the control end of the first switching tube 10 is also by the Six resistance R6 ground connection, the cold end ground connection of the first switching tube 10, the 7th resistance R7 and the 8th resistance R8 It is serially connected with between the high presser feet HV of alternating current power supply bootrom U1 and the hot end of the first switching tube 10.

As an embodiment of the present utility model, the first switching tube 10 uses NMOS tube Q1, NMOS tube The grid of Q1 is the control end of the first switching tube 10, and the source electrode of NMOS tube Q1 is the first switching tube 10 Cold end, the drain electrode of NMOS tube Q1 is the hot end of the first switching tube 10.

As another embodiment of the present utility model, the first switching tube 10 can also use NPN type triode, The base stage of NPN type triode is the control end of the first switching tube 10, the transmitting of NPN type triode extremely The cold end of one switching tube 10, the hot end of the current collection of NPN type triode the extremely first switching tube 10.

As an embodiment of the present utility model, switch element 102 includes the 3rd diode D3, the 3rd resistance R3, the 4th resistance R4 and second switch pipe 20;

The hot end of second switch pipe 20 connects second end of current-limiting resistance R5 and the first switching tube 10 respectively Controlling end, the cold end ground connection of second switch pipe 20, the control end of second switch pipe 20 is by the 3rd electricity Resistance R3 connects the negative electrode of the 3rd diode D3, and the control end of second switch pipe 20 connects also by the 4th resistance R4 Ground, the anode of the 3rd diode D3 meets the supply pin VCC of alternating current power supply bootrom U1.

In embodiment of the present utility model, the 3rd diode D3 is used for rectification.

As an embodiment of the present utility model, second switch pipe 20 uses NPN type triode Q2, NPN The control end that base stage is second switch pipe 20 of type audion Q2, the transmitting of NPN type triode Q2 is extremely The cold end of second switch pipe 20, the height of the current collection of NPN type triode Q2 extremely second switch pipe 20 Potential end.

As another embodiment of the present utility model, second switch pipe 20 can also use NMOS tube, NMOS The grid of pipe is the control end of second switch pipe 20, and the source electrode of NMOS tube is the low electricity of second switch pipe 20 Position end, the hot end that drain electrode is second switch pipe 20 of NMOS tube.

Certainly, the first switching tube 10 and second switch pipe 20 can also use controllable silicon, switch chip etc., And Fig. 4 is only an exemplary plot of the present utility model.

As an embodiment of the present utility model, AC power supply device also includes: the first diode D1, second Diode D2, the first resistance R1, the second resistance R2, commutator D, energy storage bulky capacitor EC1, transformator T and the first electric capacity C1;

The anode of the first diode D1 and the anode of the second diode D2 meet the live wire AC-L of alternating current respectively Connect altogether with the negative electrode of zero line AC-N, the first diode D1 and the negative electrode of the second diode D2, the first resistance R1 and the second resistance R2 is serially connected with negative electrode and the high pressure of alternating current power supply bootrom U1 of the first diode D1 Between foot HV, first end 1 of commutator D and the second end 2 connect the anode and of the first diode D1 respectively The anode of two diode D2, the negative pole of the anode of energy storage bulky capacitor EC1 and the armature winding of transformator T is altogether It is connected to the 4th end 4 of commutator D, the negative electrode of energy storage bulky capacitor EC1 and the 3rd end 3 of commutator D connect altogether Yu Di, the positive pole of the secondary windings of transformator T meets the supply pin VCC of alternating current power supply bootrom U1, hands over The supply pin VCC of stream power initiation chip U1 is by the first electric capacity C1 ground connection.

In the present embodiment, the first diode D1 and the second diode D2 is used for rectification.

Below in conjunction with operation principle, embodiment of the present utility model is described further:

With reference to Fig. 3, when power work, the live wire AC-L of alternating current and the electric current of zero line AC-N end are respectively After the first diode D1 and the second diode D2 rectification, then through the first resistance R1 and the second resistance R2 to the high presser feet HV exchanging power initiation chip U1 so that the high presser feet of alternating current power supply bootrom U1 HV runs, and meanwhile, signal is given to the electricity of its dynamic chip U1 of alternating current power supply through commutator D and transformator T Source foot VCC, in the process, the electric current on the secondary windings of transformator T is whole by the 3rd diode D3 After stream, then the dividing potential drop by the shunting of the 3rd resistance R3 with the 4th resistance R4, to NPN type triode Q2 One voltage of base stage, NPN type triode Q2 turn on, because of colelctor electrode and the NMOS of NPN type triode Q2 The grid of pipe Q1 is connected, and when NPN type triode Q2 turns on, voltage is from NPN type triode Q2 Colelctor electrode flows to transmitter, and now, the grid potential of NMOS tube Q1 is pulled low, and NMOS tube Q1 is ended Do not work.After power supply shuts down, the energy cut-off of the secondary windings of transformator T, and it is connected to alternating current power supply Voltage on the first electric capacity C1 of the supply pin VCC of bootrom U1 drops to 5V from 22V and also needs to 700 Many milliseconds, in this hundreds of millisecond, the energy storage of the high presser feet HV being connected to alternating current power supply bootrom U1 is big Voltage on electric capacity EC1 is through the grid of current-limiting resistance R5 and the 6th resistance R6 to NMOS tube Q1, root According to the characteristic of NMOS tube Q1, its conducting voltage is at more than 3V, and now, NMOS tube Q1 turns on, storage Voltage on energy bulky capacitor EC1 flows to the earth by the 7th resistance R7 and the 8th resistance R8, makes the big electricity of energy storage The voltage holding EC1 is in safe voltage.

In embodiment of the present utility model, described discharge circuit is connected with alternating current power supply bootrom, including Discharge cell and switch element, described switch element and described discharge cell, the electricity of alternating current power supply bootrom The high presser feet of source foot and alternating current power supply bootrom connects, described discharge cell and alternating current power supply bootrom High presser feet connects, and after power supply shuts down, described switch element controls described discharge cell and opens, to being connected to Bulky capacitor on the high presser feet of described alternating current power supply bootrom discharges so that it is the voltage at two ends is in safety In voltage range, so, both ensure that the stability of power panel, and turn avoid bulky capacitor electric discharge and carry not in time The potential safety hazard come.Meanwhile, decrease the step of manual discharge, time saving and energy saving, cost-effective.

The above is this utility model preferred embodiment, is not limited to this utility model, all in this reality Any modification, equivalent substitution and improvement etc. made by novel principle etc, should be included in this practicality new Within the protection domain of type.

Claims (9)

1. a discharge circuit, is connected with the supply pin of alternating current power supply bootrom and high presser feet, and its feature exists In, described discharge circuit includes:
First end is connected with the supply pin of described alternating current power supply bootrom, carries out the current-limiting resistance of current limliting;
It is connected with the high presser feet of described alternating current power supply bootrom, after power supply shuts down, to being connected to described friendship Bulky capacitor on the high presser feet of stream power initiation chip carries out the discharge cell discharged;
With described discharge cell, the second end of described current-limiting resistance and the power supply of described alternating current power supply bootrom Foot connects, and after power supply shuts down, controls the switch element that described discharge cell is opened.
2. discharge circuit as claimed in claim 1, it is characterised in that described discharge cell includes the 6th electricity Resistance, the 7th resistance, the 8th resistance and the first switching tube;
The control of described first switching tube terminates described switch element, and the control end of described first switching tube is the most logical Cross described 6th resistance eutral grounding, the cold end ground connection of described first switching tube, described 7th resistance and described 8th resistance is serially connected with high presser feet and the hot end of described first switching tube of described alternating current power supply bootrom Between.
3. discharge circuit as claimed in claim 2, it is characterised in that described switch element includes the three or two Pole pipe, the 3rd resistance, the 4th resistance and second switch pipe;
The hot end of described second switch pipe connects the second end of described current-limiting resistance and described first switch respectively The control end of pipe, the cold end ground connection of described second switch pipe, the control end of described second switch pipe passes through Described 3rd resistance connects the negative electrode of described 3rd diode, and the control end of described second switch pipe is also by described 4th resistance eutral grounding, the anode of described 3rd diode connects the supply pin of described alternating current power supply bootrom.
4. discharge circuit as claimed in claim 2, it is characterised in that described first switching tube uses NMOS Pipe, the grid of described NMOS tube is the control end of described first switching tube, and the source electrode of described NMOS tube is The cold end of described first switching tube, the high potential that drain electrode is described first switching tube of described NMOS tube End.
5. discharge circuit as claimed in claim 2, it is characterised in that described first switching tube uses NPN Type audion, the base stage of described NPN type triode is the control end of described first switching tube, described NPN The cold end of the most described first switching tube of transmitting of type audion, the colelctor electrode of described NPN type triode Hot end for described first switching tube.
6. discharge circuit as claimed in claim 3, it is characterised in that described second switch pipe uses NMOS Pipe, the grid of described NMOS tube is the control end of described second switch pipe, and the source electrode of described NMOS tube is The cold end of described second switch pipe, the high potential that drain electrode is described second switch pipe of described NMOS tube End.
7. discharge circuit as claimed in claim 3, it is characterised in that described second switch pipe uses NPN Type audion, the base stage of described NPN type triode is the control end of described second switch pipe, described NPN The cold end of the transmitting the most described second switch pipe of type audion, the colelctor electrode of described NPN type triode Hot end for described second switch pipe.
8. an AC power supply device, including alternating current power supply bootrom, it is characterised in that described exchange supplies Electric installation also includes the discharge circuit as described in claim 1~7 any one.
9. AC power supply device as claimed in claim 8, it is characterised in that described AC power supply device is also Including: the first diode, the second diode, the first resistance, the second resistance, commutator, energy storage bulky capacitor, Transformator and the first electric capacity;
The anode of described first diode and the anode of described second diode connect the live wire and zero of alternating current respectively Line, the negative electrode of described first diode and the negative electrode of described second diode connect altogether, described first resistance and institute State the second resistance be serially connected with the negative electrode of described first diode and described alternating current power supply bootrom high presser feet it Between, the first end of described commutator and the second end connect anode and second diode of described first diode respectively Anode, the negative pole of the anode of described energy storage bulky capacitor and the armature winding of described transformator is connected to described whole altogether 4th end of stream device, the negative electrode of described energy storage bulky capacitor and the 3rd end of described commutator are connected to ground altogether, described The positive pole of the secondary windings of transformator connects the supply pin of described alternating current power supply bootrom, and described alternating current power supply opens The supply pin of dynamic chip is by described first capacity earth.
CN201620267668.7U 2016-03-30 2016-03-30 Discharge circuit and ac energisation device CN205622496U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105680678A (en) * 2016-03-30 2016-06-15 合肥惠科金扬科技有限公司 Discharge circuit and AC power supply device
CN109116960A (en) * 2017-06-26 2019-01-01 纬创资通(中山)有限公司 Corona discharge control device, circuit and its control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105680678A (en) * 2016-03-30 2016-06-15 合肥惠科金扬科技有限公司 Discharge circuit and AC power supply device
CN105680678B (en) * 2016-03-30 2019-01-18 合肥惠科金扬科技有限公司 A kind of discharge circuit and AC power supply device
CN109116960A (en) * 2017-06-26 2019-01-01 纬创资通(中山)有限公司 Corona discharge control device, circuit and its control method
CN109116960B (en) * 2017-06-26 2020-08-07 纬创资通(中山)有限公司 Power supply discharge control device, circuit and control method thereof

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