CN205124078U - Switch bleeder circuit - Google Patents
Switch bleeder circuit Download PDFInfo
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- CN205124078U CN205124078U CN201520903467.7U CN201520903467U CN205124078U CN 205124078 U CN205124078 U CN 205124078U CN 201520903467 U CN201520903467 U CN 201520903467U CN 205124078 U CN205124078 U CN 205124078U
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Abstract
The utility model discloses a switch bleeder circuit, including first control ware, driver and freewheeling circuit, the freewheeling circuit includes choke inductance, load and freewheeling diode, first control ware control driver, the output of choke inductance is connected to the input of load, and the output of load is connected to freewheeling diode's input, and freewheeling diode's output is connected to the input of choke inductance, is current input between choke inductance and the freewheeling diode, has current output terminal between load and the freewheeling diode, it has the earial drainage switch to connect in parallel at the both ends of load, and the first control ware passes through the second controllor and is connected with the earial drainage switch. The utility model discloses can let and flow through the electrorheological of load is controllable electric current, does not influence the normal work and the life -span of load.
Description
Technical field
The utility model relates to switch bleeder circuit.
Background technology
Shown in Fig. 1 is existing switching mode current driving circuit, exchanges some V
1through rectification circuit BD
1export direct current, direct current is input to the V of current driver
+end, the DRV of current driver holds output current on choke induction L, and the output of choke induction L is connected to the input of load LED, and the output of load LED is connected to sustained diode
1input, sustained diode
1output be connected to the input of choke induction L, load LED and sustained diode
1between there is current output terminal, current output terminal is grounding to GND.PWM controller controls current driver, the V of current driver
-end is grounding to GND.When PWM controller exports high level 1, the current segment flowing through load LED through choke induction L works to ground GND, load LED, and another part freewheel current is through sustained diode
1loop is formed through load LED again after flowing through choke induction L; When PWM controller becomes the moment of low level 0 from high level 1, the inverse electromotive force remained on choke induction L produces continuous current I
s, continuous current I
sthrough load LED, sustained diode
1, choke induction L forms loop, on load LED, namely still have electric current flow through.Current waveform figure as shown in Figure 2, when PWM controller is high level work, flows through the electric current I of load LED
lEDtime is T
1, also have aftercurrent I at PWM controller turn-off transient
stime is T
2, wherein electric current I
sfor unnecessary uncontrollable electric current, luminescence and the life-span of load LED can be had influence on.
Be 201310383613.3 applyings date be 2013.8.29 publication date in Chinese Patent Application No. be in the patent documentation of 2013.11.27, disclose a kind of LED linear bleeder circuit and method, circuit comprises the PWM controller, LED drive IC, inductance and the LED that connect successively, between inductance and LED, be connected with bleeder circuit.Method step is: when starting LED, PWM controller oppositely closes bleeder circuit afterwards, and when PWM controller runs to low ground potential, PWM controller reverse starting bleeder circuit, consumes the afterflow of inductance generation by continued flow tube and power tube.Although this circuit describes the effect playing earial drainage, but in fact no matter whether bleeder circuit closes, the effect of short circuit all cannot be played to LED, namely no matter PWM controller still changes to low level moment from high level for high level, electric current on inductance all the time can through LED, or the current waveform figure that can produce as shown in Figure 2, namely still can produce aftercurrent I on LED
s, this electric current is uncontrollable.
Equally, be also disclose a kind of LED driving circuit in the patent documentation of WO2013055000A1 at Patent document number, in fact this circuit belongs to existing freewheeling circuit, also cannot remove the aftercurrent flowing through load.
Summary of the invention
In order to allow the electric current flowing through load become controllable current, do not affect normal work and the life-span of load, the utility model provides a kind of switch bleeder circuit.
For achieving the above object, switch bleeder circuit, comprises the first controller, driver and freewheeling circuit, and freewheeling circuit comprises choke induction, load and fly-wheel diode; First controller control and drive system; The output of choke induction is connected to the input of load, the output of load is connected to the input of fly-wheel diode, the output of fly-wheel diode is connected to the input of choke induction, be current input terminal between choke induction and fly-wheel diode, between load and fly-wheel diode, there is current output terminal; Be parallel with earial drainage switch at the two ends of load, the first controller is connected with earial drainage switch by second controller.
The control method of switch bleeder circuit is: when the first controller exports high level, driver startup work, and the first controller controlled discharge switch after second controller cuts out, loaded work piece, wherein a part of freewheel current I
2flow through after choke induction through fly-wheel diode and form loop through load again; When the first controller becomes low level moment from high level, driver quits work, and the first controller is controlled discharge switch opens after second controller, and load is shorted, and now, the inverse electromotive force remained on choke induction produces continuous current I
s, continuous current I
srelease through fly-wheel diode, choke induction and earial drainage switch.
Further, the first described controller is PWM controller, and described second controller is inverter.
Further, PWM controller is connected with driver and inverter, and driver connects DC output end, and driver is connected with current input terminal, and the output head grounding between load and fly-wheel diode is to GND, and driver is connected with GND; Described earial drainage switch is switch MOS pipe Q
1, the output of inverter is connected to switch MOS pipe Q
1g extremely go up.
Further, PWM controller is connected with driver and inverter; Driver connects DC output end, and DC output end is connected with current input terminal, and driver is connected to metal-oxide-semiconductor Q
2g extremely go up, the output between load and fly-wheel diode is through metal-oxide-semiconductor Q
2be grounding to GND, driver is connected with GND; Described earial drainage switch is switch MOS pipe, and the G that the output of inverter is connected to switch MOS pipe extremely goes up.
The beneficial effects of the utility model are: when the first controller exports high level, generation current I in load
1this electric current is controllable, it is the electric current required for load, when the first controller becomes low level moment from high level, because earial drainage switch can be opened, load is shorted, therefore, this time period internal burden do not have all the time choke induction the aftercurrent that remains pass through, and aftercurrent to be released.Therefore, no matter which kind of operating state the first controller is in, and the electric current flowing through load is all controlled, can not affect normal work and the life-span of load.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of prior art switching mode current driving circuit.
Fig. 2 is prior art switching mode current driving circuit current waveform figure.
Fig. 3 is the utility model control logic figure.
Fig. 4 is the utility model embodiment 1 switch bleeder circuit figure.
Schematic diagram when Fig. 5 is the utility model embodiment 1 switch bleeder circuit PWM controller output high level.
Fig. 6 is that utility model embodiment 1 switch bleeder circuit PWM controller becomes the schematic diagram of low level moment from high level.
Fig. 7 is the utility model embodiment 2 switch bleeder circuit figure.
Fig. 8 is the current waveform figure of the utility model switch bleeder circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further elaborated.
Embodiment 1.
As shown in Figure 3, switch bleeder circuit comprises the first controller, driver, freewheeling circuit and bleeder circuit.
As shown in Figure 3 and Figure 4, the first controller is PWM controller.Driver is current driver U
1, current driver U
1there is input V
+with PWM input and output DRV and V-
-.AC power V
1through rectification circuit BD
1be converted to direct current and be input to current driver U
1input V
+, signal is input to current driver U by PWM controller
1pWM input, current driver U
1input V
-be grounding to GND.
Described freewheeling circuit comprises choke induction L, load LED and sustained diode
1, the output of choke induction L is connected to the input of load LED, and the output of load LED is connected to sustained diode
1input, sustained diode
1output be connected to the input of choke induction L, choke induction L and sustained diode
1between be current input terminal, current input terminal is connected to current driver U
1output DRV, load LED and sustained diode
1between there is current output terminal, this current output terminal is grounding to GND, is connected to rectification circuit BD simultaneously
1on.
Described bleeder circuit comprises second controller and earial drainage switch, and second controller is inverter U
2, earial drainage switch is switch MOS pipe Q
1, PWM controller is through inverter U
2be connected to the G pole of switch MOS pipe, the switch MOS pipe Q described in the two ends parallel connection of load LED
1.
The control method of above-mentioned switch bleeder circuit is: as shown in Figure 5, and when PWM controller exports high level 1, PWM controller is through inverter U
2rear output low level, switch MOS pipe Q
1close, flow through the electric current I of load LED through choke induction L
1part is to ground GND, another part freewheel current I
2through sustained diode
1loop is formed through load LED again after flowing through choke induction L.As shown in Figure 6, when PWM controller becomes low level moment from high level, PWM controller is through inverter U
2rear output high level, switch MOS pipe Q
1open, load LED is shorted, and now, the inverse electromotive force remained on choke induction L produces continuous current I
s, continuous current I
sthrough sustained diode
1, choke induction L and switch MOS pipe Q
1release.
As shown in Figure 8, when PWM controller exports high level, generation current I on load LED
1, i.e. I
lEDthe time produced is T
1, this electric current is controllable, is the electric current required for load LED, when PWM controller becomes low level moment from high level, due to switch MOS pipe Q
1can be opened, load LED is shorted, therefore, this time period internal burden LED do not have all the time choke induction the aftercurrent that remains pass through, see Fig. 8, at time T
1after without current waveform, and aftercurrent to be released.Therefore, no matter which kind of operating state is PWM controller be in, and the electric current flowing through load LED is all controlled, can not affect normal work and the life-span of load.
Embodiment 2.
As shown in Figure 3, switch bleeder circuit comprises the first controller, driver, freewheeling circuit and bleeder circuit.
As shown in Figure 3 and Figure 7, the first controller is PWM controller.Driver is current driver U
1, current driver U
1there is input V
+with PWM input and output DRV and V-
-.AC power V
1through rectification circuit BD
1be converted to direct current and be input to current driver U
1input V
+, simultaneously through rectifier BD
1direct current be directly inputted on choke induction L, signal is input to current driver U by PWM controller
1pWM input, current driver U
1input V
-be grounding to GND, the output DRV of current driver is connected to metal-oxide-semiconductor Q
2g extremely go up.
Described freewheeling circuit comprises choke induction L, load LED and sustained diode
1, the output of choke induction L is connected to the input of load LED, and the output of load LED is connected to sustained diode
1input, sustained diode
1output be connected to the input of choke induction L, choke induction L and sustained diode
1between be current input terminal, current input terminal is connected to current driver U
1output DRV, load LED and sustained diode
1between there is current output terminal, this current output terminal is through metal-oxide-semiconductor Q
2be grounding to GND, be connected to rectification circuit BD simultaneously
1on.
Described bleeder circuit comprises second controller and earial drainage switch, and second controller is inverter U
2, earial drainage switch is switch MOS pipe Q
1, PWM controller is through inverter U
2be connected to the G pole of switch MOS pipe, the switch MOS pipe Q described in the two ends parallel connection of load LED
1.
The control method of above-mentioned switch bleeder circuit is: when PWM controller exports high level 1, PWM controller is through inverter U
2rear output low level, switch MOS pipe Q
1close, metal-oxide-semiconductor Q
2open, flow through the electric current I of load LED through choke induction L
1part is through metal-oxide-semiconductor Q
2to ground GND, another part freewheel current I
2through sustained diode
1loop is formed through load LED again after flowing through choke induction L.When PWM controller becomes low level moment from high level, PWM controller is through inverter U
2rear output high level, switch MOS pipe Q
1open, metal-oxide-semiconductor Q
2open, load LED is shorted, and now, the inverse electromotive force remained on choke induction L produces continuous current I
s, continuous current I
sthrough sustained diode
1, choke induction L and switch MOS pipe Q
1release.
As shown in Figure 8, when PWM controller exports high level, generation current I on load LED
1, i.e. I
lEDthe time produced is T
1, this electric current is controllable, is the electric current required for load LED, when PWM controller becomes low level moment from high level, due to switch MOS pipe Q
1can be opened, load LED is shorted, therefore, this time period internal burden LED do not have all the time choke induction the aftercurrent that remains pass through, see Fig. 8, at time T
1after without current waveform, and aftercurrent to be released.Therefore, no matter which kind of operating state is PWM controller be in, and the electric current flowing through load LED is all controlled, can not affect normal work and the life-span of load.
Claims (4)
1. switch bleeder circuit, comprises the first controller, driver and freewheeling circuit, and freewheeling circuit comprises choke induction, load and fly-wheel diode; First controller control and drive system; The output of choke induction is connected to the input of load, the output of load is connected to the input of fly-wheel diode, the output of fly-wheel diode is connected to the input of choke induction, be current input terminal between choke induction and fly-wheel diode, between load and fly-wheel diode, there is current output terminal; It is characterized in that: be parallel with earial drainage switch at the two ends of load, the first controller is connected with earial drainage switch by second controller.
2. switch bleeder circuit according to claim 1, is characterized in that: the first described controller is PWM controller, and described second controller is inverter.
3. switch bleeder circuit according to claim 2, it is characterized in that: PWM controller is connected with driver and inverter, driver connects DC output end, and driver is connected with current input terminal, output head grounding between load and fly-wheel diode is to GND, and driver is connected with GND; Described earial drainage switch is switch MOS pipe Q
1, the output of inverter is connected to switch MOS pipe Q
1g extremely go up.
4. switch bleeder circuit according to claim 2, is characterized in that: PWM controller is connected with driver and inverter; Driver connects DC output end, and DC output end is connected with current input terminal, and driver is connected to metal-oxide-semiconductor Q
2g extremely go up, the output between load and fly-wheel diode is through metal-oxide-semiconductor Q
2be grounding to GND, driver is connected with GND; Described earial drainage switch is switch MOS pipe, and the G that the output of inverter is connected to switch MOS pipe extremely goes up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520903467.7U CN205124078U (en) | 2015-11-13 | 2015-11-13 | Switch bleeder circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520903467.7U CN205124078U (en) | 2015-11-13 | 2015-11-13 | Switch bleeder circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205124078U true CN205124078U (en) | 2016-03-30 |
Family
ID=55579643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520903467.7U Active CN205124078U (en) | 2015-11-13 | 2015-11-13 | Switch bleeder circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205124078U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282937A (en) * | 2015-11-13 | 2016-01-27 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method thereof |
-
2015
- 2015-11-13 CN CN201520903467.7U patent/CN205124078U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282937A (en) * | 2015-11-13 | 2016-01-27 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method thereof |
| WO2017080086A1 (en) * | 2015-11-13 | 2017-05-18 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method |
| CN105282937B (en) * | 2015-11-13 | 2018-03-02 | 广州市雅江光电设备有限公司 | Switch bleeder circuit and control method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |