CN201910735U - Circuit capable of suppressing starting instant impulse current of display switching power supply - Google Patents
Circuit capable of suppressing starting instant impulse current of display switching power supply Download PDFInfo
- Publication number
- CN201910735U CN201910735U CN2011200054925U CN201120005492U CN201910735U CN 201910735 U CN201910735 U CN 201910735U CN 2011200054925 U CN2011200054925 U CN 2011200054925U CN 201120005492 U CN201120005492 U CN 201120005492U CN 201910735 U CN201910735 U CN 201910735U
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- China
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- power supply
- power
- power switch
- current
- switch pipe
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model relates to a circuit capable of suppressing starting instant impulse current of a display switching power supply, which comprises a power-frequency capacitor of the display switching power source. The circuit capable of suppressing starting instant impulse current of the display switching power supply is characterized in that a negative end of the power-frequency capacitor is connected with a drain electrode of a power switch tube, a current-limiting resistor is connected between the drain electrode of the power switch tube and a source electrode thereof, and a grid electrode of the power switch tube is connected with a control circuit controlling the power switch tube. The circuit is simple in structure, the power switch tube is used for realizing short circuit of the current limiting resistor, capacity and reliability in suppressing starting instant impulse current of the display switching power supply are enhanced, cost is reduced, and product quality and competitive power are improved.
Description
Technical field
The utility model relates to a kind of inhibition monitor switch power supply start moment impact current circuit.
Background technology
At present Switching Power Supply for the moment electrical network of suppressing to start shooting to the impulse current of power frequency filter capacitor charging, all be the impulse current that adopts when the L that exchanges input or NTCR thermistor of N end series connection reduce start basically.This scheme can only be in low-power applications, and NTCR is connected in the ac input circuit, produces power consumption, and efficient is low; And if after power supply start a period of time, the temperature of NTCR body rises, resistance descends, if do the switching on and shutting down action this moment, its effect that suppresses impulse current will be had a greatly reduced quality.
If middle power or large power supply, then relay of often opening in parallel at the NTCR two ends.As shown in Figure 1, Fig. 1 is the switching power circuit figure that tradition is provided with thermistor and relay, after power supply start, comes the control relay closure with the output voltage of the auxiliary winding of power transformer, promptly after the power supply operate as normal with the NTCR short circuit.This scheme not only cost of relay is higher, and the contact of relay is fragile.During the high-speed switch machine, possible misoperation and do not reach the purpose that suppresses the moment impact electric current.
Summary of the invention
The purpose of this utility model provides a kind of inhibition monitor switch power supply start moment impact current circuit, can improve ability and reliability that power supply is prevented start moment impact electric current.
The utility model adopts following scheme to realize for achieving the above object: a kind of inhibition monitor switch power supply start moment impact current circuit, the power frequency electric capacity that comprises the monitor switch power supply, it is characterized in that: the negative terminal of described power frequency electric capacity is connected with the drain electrode of a power switch pipe, be connected with current-limiting resistance between the drain electrode of described power switch pipe and the source electrode, the grid of described power switch pipe is connected with the control circuit of this power switch pipe of control.
In the utility model one examples of implementation, described control circuit is made up of first resistance, second resistance, delay electric capacity and voltage-stabiliser tube, the grid of described power switch pipe connects the negative terminal that the auxiliary winding of display standby power is exported rectifier diode through first resistance, and described second resistance, delay electric capacity and voltage-stabiliser tube are connected to the grid and the source electrode of described power switch pipe.
The utility model circuit structure is simple, utilizes power switch pipe with the current-limiting resistance short circuit, not only improves ability and reliability that power supply suppresses start moment impact electric current, and reduces cost, and improves the quality and the competitiveness of product.
Description of drawings
Fig. 1 is the switching power circuit figure that tradition is provided with thermistor and relay.
Fig. 2 is the utility model circuit theory schematic diagram.
Fig. 3 is the circuit diagram that the utility model embodiment is applied to Switching Power Supply.
Fig. 4 is the enlarged diagram of A part among Fig. 3.
Embodiment
As shown in Figure 2, the utility model provides a kind of inhibition monitor switch power supply start moment impact current circuit, the power frequency electric capacity that comprises the monitor switch power supply, it is characterized in that: the negative terminal of described power frequency electric capacity is connected with the drain electrode of a power switch pipe, be connected with current-limiting resistance between the drain electrode of described power switch pipe and the source electrode, the grid of described power switch pipe is connected with the control circuit of this power switch pipe of control.
Please refer to Fig. 3 and Fig. 4, Fig. 3 is the circuit diagram that the utility model embodiment is applied to Switching Power Supply, Fig. 4 is the enlarged diagram of A part among Fig. 3, in the present embodiment, this circuit comprises current-limiting resistance R866, power switch pipe Q815 and control circuit, and described control circuit comprises R865, C955, ZD802 and R864; Current-limiting resistance is connected between the drain electrode and source electrode of power switch pipe, and the D utmost point of power switch pipe connects the negative terminal of power frequency electric capacity, S utmost point ground connection, and the G utmost point connects the auxiliary winding output of standby power rectifier diode negative terminal through R865.G, the electric capacity C955 that postpones in parallel between the S utmost point, bleeder resistance R864 and protection voltage-stabiliser tube ZD802.
When Switching Power Supply was started shooting, ac grid voltage was through rectifier bridge BD901, and the PFC impulse current is protected diode D903 and power frequency capacitor C 909, and current-limiting resistance R866 charges to power frequency electric capacity.When power frequency electric capacity was charged to the magnitude of voltage of a setting, the power supply of standby power supply was started working, and after the auxiliary winding output voltage of standby power supply reached certain voltage, beginning was charged to C955 through R865.After the voltage on the C955 reaches the threshold voltage that Q815 opens, the Q815 saturation conduction, current-limiting resistance R866 is close to the road by Q815.
When Switching Power Supply was shut down, when power frequency electric capacity both end voltage dropped to certain voltage, standby power turn-offed, and auxiliary winding output voltage descends, and the voltage on the C955 is also through the R864 discharge, and when the voltage on the C955 dropped to the threshold voltage of Q815, Q815 turn-offed.
The utlity model has following characteristics:
1, the method for traditional inhibition power supply start moment impact electric current is that NTCR is connected among the L or N line that exchanges input, and the current effective value that flows through this NTCR is the effective value (Iac_rms) that exchanges input current.And adopt the scheme of this motion, and power resistor is connected on the negative terminal of power frequency filter capacitor, and the current effective value that flows through this current-limiting resistance equals
, wherein
The power consumption of current-limiting resistance is the output current of power frequency electric capacity, so will significantly reduce.
2, after the power supply start, utilize power MOSFET with this current-limiting resistance short circuit, the internal resistance of power MOSFET is less, will further reduce power consumption, raises the efficiency.
3, the resistance that suppresses impulse current with common power resistor, can reduce circuit cost without NTCR greatly.
4, the resistance that suppresses impulse current is not to be connected on the L or N line that exchanges input, but the negative terminal that is connected on the power frequency filter capacitor is after the power supply operate as normal, be not with relay with this resistive short, but control with MOSFET.
The above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (2)
1. one kind is suppressed monitor switch power supply start moment impact current circuit, the power frequency electric capacity that comprises the monitor switch power supply, it is characterized in that: the negative terminal of described power frequency electric capacity is connected with the drain electrode of a power switch pipe, be connected with current-limiting resistance between the drain electrode of described power switch pipe and the source electrode, the grid of described power switch pipe is connected with the control circuit of this power switch pipe of control.
2. inhibition monitor switch power supply start moment impact current circuit according to claim 1, it is characterized in that: described control circuit is made up of first resistance, second resistance, delay electric capacity and voltage-stabiliser tube, the grid of described power switch pipe connects the negative terminal that the auxiliary winding of display standby power is exported rectifier diode through first resistance, and described second resistance, delay electric capacity and voltage-stabiliser tube are connected to the grid and the source electrode of described power switch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200054925U CN201910735U (en) | 2011-01-10 | 2011-01-10 | Circuit capable of suppressing starting instant impulse current of display switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200054925U CN201910735U (en) | 2011-01-10 | 2011-01-10 | Circuit capable of suppressing starting instant impulse current of display switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201910735U true CN201910735U (en) | 2011-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200054925U Expired - Fee Related CN201910735U (en) | 2011-01-10 | 2011-01-10 | Circuit capable of suppressing starting instant impulse current of display switching power supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN201910735U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429120A (en) * | 2015-11-19 | 2016-03-23 | 广州中逸光电子科技有限公司 | Surge current suppression circuit |
| CN108173305A (en) * | 2017-12-29 | 2018-06-15 | 河南中烟工业有限责任公司 | A kind of low-temperature bake smoking set with stepping functions rapid nitriding |
| CN111541224A (en) * | 2020-04-29 | 2020-08-14 | 中国电子科技集团公司第十四研究所 | Anti-surge circuit suitable for transient state frequent switching on and shutting down |
| CN111864616A (en) * | 2020-06-22 | 2020-10-30 | 深圳供电局有限公司 | Display device control circuit and five-prevention locking system |
| CN112928933A (en) * | 2021-01-15 | 2021-06-08 | 北京军陶科技有限公司 | Power supply with surge current suppression and enable control |
-
2011
- 2011-01-10 CN CN2011200054925U patent/CN201910735U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105429120A (en) * | 2015-11-19 | 2016-03-23 | 广州中逸光电子科技有限公司 | Surge current suppression circuit |
| CN108173305A (en) * | 2017-12-29 | 2018-06-15 | 河南中烟工业有限责任公司 | A kind of low-temperature bake smoking set with stepping functions rapid nitriding |
| CN111541224A (en) * | 2020-04-29 | 2020-08-14 | 中国电子科技集团公司第十四研究所 | Anti-surge circuit suitable for transient state frequent switching on and shutting down |
| CN111864616A (en) * | 2020-06-22 | 2020-10-30 | 深圳供电局有限公司 | Display device control circuit and five-prevention locking system |
| CN112928933A (en) * | 2021-01-15 | 2021-06-08 | 北京军陶科技有限公司 | Power supply with surge current suppression and enable control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110727 Termination date: 20140110 |