CN205453526U - Switch power supply circuit - Google Patents
Switch power supply circuit Download PDFInfo
- Publication number
- CN205453526U CN205453526U CN201521100010.9U CN201521100010U CN205453526U CN 205453526 U CN205453526 U CN 205453526U CN 201521100010 U CN201521100010 U CN 201521100010U CN 205453526 U CN205453526 U CN 205453526U
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- resistance
- rectifier bridge
- effect transistor
- field effect
- negative output
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Abstract
The utility model discloses a switch power supply circuit, it includes the rectifier bridge that is connected with alternating current power supply, connect the switch between alternating current power supply and rectifier bridge, electric capacity C1, zener diode D2, triode Q2, field effect transistor Q3, resistance R1, R2, R8, R11, R13 and DC -DC power, electric capacity C1 connects between the positive and negative output of rectifier bridge, zener diode D2, resistance R0, R13 establishes ties in proper order between the positive and negative output of rectifier bridge, triode Q2's collecting electrode passes through the forward transportation output that resistance R1 connects the rectifier bridge, the negative output end of rectifier bridge is connected to triode Q2's projecting pole, triode Q2's base and resistance R11's one end are connected, field effect transistor Q3's grid is connected with triode Q2's collecting electrode, field effect transistor Q3's drain electrode is connected with the negative output of rectifier bridge end, the DC -DC power is connected between the positive and negative output of rectifier bridge.
Description
Technical field
This utility model relates to circuit field, particularly relates to the switching power circuit of the electric leakage scintillation of a kind of switch eliminating vicarious or tape light.
Background technology
At existing stair, stair passage, the sonic-opticalcon trolled switch of corridor, infrared sensing switch and the switch on wall of indoor band display lamp at night, after power cutoff, there are small leakage current flow through, cause the LED lamp of on-off control or florescent lamp fitting exist turn off the light after the phenomenon that persistently flashes of light fixture, the easily life at night of interference people.
Summary of the invention
The purpose of this utility model is to provide a kind of switching power circuit that can eliminate the light fixture flicker problem that small leakage current causes.
nullFor solving technical problem of the present utility model，This utility model provides a kind of switching power circuit，It includes the rectifier bridge being connected with alternating current power supply、The switch being connected between alternating current power supply and rectifier bridge、Electric capacity C1、Zener diode D2、Audion Q2、Field effect transistor Q3、Resistance R1、R2、R8、R11、R13 and DC-DC power source，Electric capacity C1 is connected between the positive-negative output end of rectifier bridge，Zener diode D2、Resistance R0、R13 is sequentially connected in series between the positive-negative output end of rectifier bridge，And the negative pole of Zener diode D2 connects the positive output end of rectifier bridge，The colelctor electrode of audion Q2 connects the positive output end of rectifier bridge by resistance R1，The emitter stage of audion Q2 connects the negative output terminal of rectifier bridge，The base stage of audion Q2 is connected with one end of resistance R11，The other end of resistance R11 is connected with the negative output terminal of rectifier bridge by resistance R13，The grid of field effect transistor Q3 is connected with the colelctor electrode of audion Q2，Resistance R2 is series between the source electrode of field effect transistor Q3 and the positive output end of rectifier bridge，The drain electrode of field effect transistor Q3 is connected with the negative output terminal of rectifier bridge，DC-DC power source is connected between the positive-negative output end of rectifier bridge.
Wherein, described switching power circuit farther includes the electric capacity C3 in parallel with resistance R13.
Wherein, described switching power circuit farther includes the Zener diode D3 connected with Zener diode D2.
Wherein, described switching power circuit farther includes Zener diode D5, and its negative pole is connected with the grid of field effect transistor Q3, and its positive pole is connected with the negative output terminal of rectifier bridge.
Wherein, described switching power circuit farther includes the resistance R10 being series between resistance R8 and resistance R13.
Wherein, described switching power circuit farther includes the resistance R6 being series between the colelctor electrode of the audion Q2 of resistance R1.
Wherein, described switching power circuit farther includes resistance R3, R4, R5, and resistance R2, R3 are in parallel, is series between the source electrode of field effect transistor Q3 and the positive output end of rectifier bridge with the resistance bridge of resistance R2, R3 composition after resistance R4, R5 parallel connection.
The beneficial effects of the utility model are: use the circuit being made up of audion Q2 and field effect transistor Q3 to be bled off by the leakage current in switch, it is therefore prevented that the continuation scintillation that powered-down rear switch leakage current causes.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the switching power circuit of this utility model embodiment 1.
Fig. 2 is the circuit diagram of the switching power circuit of this utility model embodiment 2.
Detailed description of the invention
As it is shown in figure 1, the switching power circuit of this utility model embodiment 1 includes the rectifier bridge being connected with alternating current power supply, the switch being connected between alternating current power supply and rectifier bridge, electric capacity C1, C3, Zener diode D2, D3, D5, audion Q2, field effect transistor Q3, resistance R1, R2, R3, R4, R5, R6, R8, R10, R11, R13 and DC-DC power source.Electric capacity C1 is connected between the positive-negative output end of rectifier bridge.Zener diode D2, D3, resistance R8, R10, R13 are sequentially connected in series between the positive-negative output end of rectifier bridge, and the negative pole of Zener diode D2 connects the positive output end of rectifier bridge.The colelctor electrode of audion Q2 connects the positive output end of rectifier bridge by resistance R6, R1, the emitter stage of audion Q2 connects the negative output terminal of rectifier bridge, the base stage of audion Q2 is connected with one end of resistance R11, and the other end of resistance R11 is connected with the negative output terminal of rectifier bridge by resistance R13.Electric capacity C3 is in parallel with resistance R13.The grid of field effect transistor Q3 is connected with the colelctor electrode of audion Q2.The negative pole of Zener diode D5 is connected with the grid of field effect transistor Q3, and the positive pole of Zener diode D5 is connected with the negative output terminal of rectifier bridge.Resistance R2, R3 are in parallel, are series between the source electrode of field effect transistor Q3 and the positive output end of rectifier bridge with the resistance bridge of resistance R2, R3 composition after resistance R4, R5 parallel connection.The drain electrode of field effect transistor Q3 is connected with the negative output terminal of rectifier bridge.DC-DC power source is connected between the positive-negative output end of rectifier bridge.The operation principle of this circuit is:
When normally inputting the running voltage of AC100-240V, field effect transistor Q3 first turns on, electric capacity C1 is discharged, but electric capacity C1 voltage is charged to rapidly high pressure, stabilivolt D2, D3 puncture and flow through electric current, make audion Q2 turn on, drag down the base potential of field effect transistor Q3 to 0V, the cut-off of field effect transistor Q3 is not turned on, and electric capacity C1 voltage becomes normal voltage, and the DC-DC power source of rear termination normally works.
Input is connected to the switches such as acousto-optic, infrared induction, band indicator light switch at night, in the case of powered-down, sensing or functions of indicator light for maintained switch, Weak current is also had to flow into (within 5MA) on switch, to electric capacity C1 low current charge, voltage slowly rises, owing to voltage rises slower, electric capacity C1 is discharged by field effect transistor Q3 conducting simultaneously, make electric capacity C1 voltage less than 30V, so that the breakdown voltage that the voltage of electric capacity C1 is less than stabilivolt D2+D3, it is impossible to make audion Q2 turn off field effect transistor Q3.Electric capacity C1 is discharged by field effect transistor Q3 always, and backend load DC-DC, due to electric capacity C1 brownout, quits work.Until input inputs normal voltage, field effect transistor Q3 is turned off by audion Q2, and DC-DC power source output in rear end the most normally exports.
If not using foregoing circuit, owing to there being the input of little leakage current that electric capacity C1 is charged, when electric capacity C1 voltage is charged to certain voltage, reach the startup voltage of rear end DC-DC power source, DC-DC power source will work, but input current is the least, and the electricity of momentary capacitance C1 is discharged, enter charging and discharging next time from new charging again, thus the lamp light source causing power supply to be connect can be flickering.Use foregoing circuit that the powered-down continuation scintillation of switch then can be completely eliminated.
As in figure 2 it is shown, the circuit of embodiment 1 can carry out the deformation of alternate manner, such as, resistance R8, R10 are replaced by a resistance R8, and resistance R1, R6 are replaced by a resistance R1, and the resistance bridge of resistance R2, R3, R4, R5 composition can be replaced by a resistance R2.Stabilivolt D2, D3 are replaced by a stabilivolt D2.
The beneficial effects of the utility model are: use the circuit being made up of audion Q2 and field effect transistor Q3 to be bled off by the leakage current in switch, it is therefore prevented that the continuation scintillation that powered-down rear switch leakage current causes.
Above content is to combine concrete preferred implementation further detailed description of the utility model, it is impossible to assert that of the present utility model being embodied as is confined to these explanations.For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, it is also possible to make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (7)
- null1. a switching power circuit，It is characterized in that，Including the rectifier bridge being connected with alternating current power supply、The switch being connected between alternating current power supply and rectifier bridge、Electric capacity C1、Zener diode D2、Audion Q2、Field effect transistor Q3、Resistance R1、R2、R8、R11、R13 and DC-DC power source，Electric capacity C1 is connected between the positive-negative output end of rectifier bridge，Zener diode D2、Resistance R0、R13 is sequentially connected in series between the positive-negative output end of rectifier bridge，And the negative pole of Zener diode D2 connects the positive output end of rectifier bridge，The colelctor electrode of audion Q2 connects the positive output end of rectifier bridge by resistance R1，The emitter stage of audion Q2 connects the negative output terminal of rectifier bridge，The base stage of audion Q2 is connected with one end of resistance R11，The other end of resistance R11 is connected with the negative output terminal of rectifier bridge by resistance R13，The grid of field effect transistor Q3 is connected with the colelctor electrode of audion Q2，Resistance R2 is series between the source electrode of field effect transistor Q3 and the positive output end of rectifier bridge，The drain electrode of field effect transistor Q3 is connected with the negative output terminal of rectifier bridge，DC-DC power source is connected between the positive-negative output end of rectifier bridge.
- Switching power circuit the most according to claim 1, it is characterised in that farther include the electric capacity C3 in parallel with resistance R13.
- Switching power circuit the most according to claim 1, it is characterised in that farther include the Zener diode D3 connected with Zener diode D2.
- Switching power circuit the most according to claim 1, it is characterised in that farther include Zener diode D5, its negative pole is connected with the grid of field effect transistor Q3, and its positive pole is connected with the negative output terminal of rectifier bridge.
- Switching power circuit the most according to claim 1, it is characterised in that farther include the resistance R10 being series between resistance R8 and resistance R13.
- Switching power circuit the most according to claim 1, it is characterised in that farther include the resistance R6 being series between the colelctor electrode of the audion Q2 of resistance R1.
- Switching power circuit the most according to claim 1, it is characterized in that, farther including resistance R3, R4, R5, resistance R2, R3 are in parallel, are series between the source electrode of field effect transistor Q3 and the positive output end of rectifier bridge with the resistance bridge of resistance R2, R3 composition after resistance R4, R5 parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521100010.9U CN205453526U (en) | 2015-12-25 | 2015-12-25 | Switch power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521100010.9U CN205453526U (en) | 2015-12-25 | 2015-12-25 | Switch power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205453526U true CN205453526U (en) | 2016-08-10 |
Family
ID=56578419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521100010.9U Expired - Fee Related CN205453526U (en) | 2015-12-25 | 2015-12-25 | Switch power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205453526U (en) |
-
2015
- 2015-12-25 CN CN201521100010.9U patent/CN205453526U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160810 Termination date: 20161225 |