CN204578852U - Antihunt circuit and there is the LED drive circuit of antihunt circuit - Google Patents
Antihunt circuit and there is the LED drive circuit of antihunt circuit Download PDFInfo
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- CN204578852U CN204578852U CN201520278598.0U CN201520278598U CN204578852U CN 204578852 U CN204578852 U CN 204578852U CN 201520278598 U CN201520278598 U CN 201520278598U CN 204578852 U CN204578852 U CN 204578852U
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Abstract
The utility model provides a kind of antihunt circuit and has the LED drive circuit of antihunt circuit.Antihunt circuit it comprise damping element, control circuit and control switch.Damping element is electrically connected DC bus.Control circuit obtains supply power voltage from DC bus and is compared with threshold voltage by supply power voltage, and when DC bus-bar voltage is higher than threshold voltage, control circuit exports the first control signal.Control switch is electrically connected damping element and control circuit respectively, and damping element is cut circuit by the first control signal that control switch exports based on control circuit.By arranging antihunt circuit in LED drive circuit, startup stage, antihunt circuit can effectively suppress voltage on DC bus to continue to raise, and effectively reduces the voltage withstand class of rear stage circuit, LED is driven mutually compatible with electric ballast.
Description
Technical field
The utility model relates to field of LED drive, and in particular to a kind of antihunt circuit and the LED drive circuit with antihunt circuit.
Background technology
Traditional electric ballast connects fluorescent load, because the luminous efficiency of fluorescent lamp is lower, there is certain environmental pollution.In today of energy-saving and emission-reduction, fluorescent lamp is replaced with LED and become a kind of trend.In order to realize direct replacement, LED not only needs can accept common civil power for its power supply, also needs directly to connect, powers by electronic ballast for fluoresent lamp as it.But the output of electric ballast is the AC signal of high frequency, and LED needs direct current supply, and both cannot directly mate.Therefore, usually need the output of electric ballast to become direct current by rectifier bridge rectification, then utilize LED driver to be converted into direct current needed for LED load.
But, electric ballast owing to being specially for fluorescent lamp designs, the startup stage that its course of work comprising and steady-state process.Startup stage, electric ballast exports a high pressure with the fluorescent tube of breakdown fluorescent lamp, realizes the glow discharge of fluorescent lamp, its output voltage usually between hundreds of volt a to kilovolt, far away higher than the voltage (usual below 200V) of steady-state process.If this electric ballast being applicable to conventional fluorescent is directly accessed LED driver, then the high pressure produced startup stage will bring great challenge to the design of the LED driver of rear class.
Utility model content
The utility model in order to solve electric ballast be LED power time, because the design of high pressure to the LED driver of rear class exported the startup stage of electric ballast brings the problem of difficulty, a kind of antihunt circuit is provided and there is the LED drive circuit of antihunt circuit.
To achieve these goals, the utility model provides a kind of antihunt circuit, and it comprises damping element, control circuit and control switch.Damping element is electrically connected DC bus.Control circuit obtains supply power voltage from DC bus and is compared with threshold voltage by supply power voltage, and when supply power voltage is higher than threshold voltage, control circuit exports the first control signal.Control switch is electrically connected damping element and control circuit respectively, and damping element is cut circuit by the first control signal that control switch exports based on control circuit.
In the utility model one embodiment, control circuit comprises comparator and controller, one of them input input supply power voltage of comparator, another input input voltage threshold value, output exports comparison signal to controller, and controller exports first according to comparison signal and controls signal to control switch.
In the utility model one embodiment, control circuit also comprises timer, when controller exports the first control signal, timer starts timing, when the timing time threshold value time of advent, controller exports the second control signal, and damping element is cut out circuit by the second control signal that control switch exports based on control circuit.
In the utility model one embodiment, antihunt circuit also comprises voltage stabilizing power supplying circuit, and voltage stabilizing power supplying circuit exports control circuit to after carrying out voltage stabilizing process to supply power voltage.
In the utility model one embodiment, voltage stabilizing power supplying circuit comprises diode and charging capacitor, the positive pole of diode is electrically connected the output of damping element, the negative pole of diode is connected with control circuit with charging capacitor respectively, DC bus-bar voltage is by damping element and the charging of diode pair charging capacitor, and the voltage at charging capacitor two ends exports control circuit to.
In the utility model one embodiment, damping element is power resistor.
In the utility model one embodiment, control switch is NMOS tube or NPN triode, and when control switch is NMOS tube, the drain electrode of NMOS tube and the output of damping element are electrically connected, the grid of NMOS tube and control circuit are electrically connected, the source ground of NMOS tube; When control switch is NPN triode, the collector electrode of NPN triode and the output of damping element are electrically connected, and the base stage of NPN triode and control circuit are electrically connected, the grounded emitter of NPN triode.
In the utility model one embodiment, control switch is PMOS or PNP triode, and when control switch is PMOS, the drain electrode of PMOS and the output of damping element are electrically connected, the grid of PMOS and control circuit are electrically connected, and the source electrode of PMOS connects DC bus; When control switch is PNP triode, the collector electrode of PNP triode and damping element are electrically connected, and the base stage of PNP triode and control circuit are electrically connected, and the emitter of PNP triode connects DC bus.
According to another aspect of the present utility model, also provide a kind of LED drive circuit with antihunt circuit, this LED drive circuit comprises electric ballast, rectification circuit, the electric capacity being connected in parallel on rectification circuit output end and antihunt circuit described above.
In the utility model one embodiment, rectification circuit can be full-bridge rectification or Half bridge rectifier.
According to antihunt circuit of the present utility model and the LED drive circuit with antihunt circuit, when DC bus export high pressure time (as electric ballast startup stage), by control switch, damping element is cut circuit, the high voltage realized DC bus exports suppresses, reduce the voltage withstand class of late-class circuit, effectively avoid because the damage caused by high pressure maybe can not work.Concrete implementation is: control circuit obtains supply power voltage from DC bus, and when supply power voltage is higher than the voltage threshold set, control circuit exports the first control signal Closed control switch.Control switch closes, and the damping element be connected with DC bus will be cut circuit, and damping element effectively suppresses the continuation of busbar voltage to raise, and reaches protection late-class circuit and makes it enter normal operating conditions.
In actual use, after load and DC bus are connected and have output current, the voltage on DC bus can reduce gradually.Therefore, for improving the efficiency of circuit, need in time damping element to be cut out circuit after load is connected.In the present embodiment, by setup times threshold value, when the first control signal Closed control switch, timer starts timing, after reaching time threshold, control circuit exports the second control signal closing control switch, in time damping element is cut out circuit, eliminate the power consumption on damping element, improve the power output of circuit.
For above-mentioned and other objects, features and advantages of the present utility model can be become apparent, preferred embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below.
Accompanying drawing explanation
Figure 1 shows that the existing schematic diagram using electron rectifier as the LED drive circuit of input.
Figure 2 shows that the schematic diagram of the antihunt circuit that the utility model one embodiment provides.
Figure 3 shows that the schematic diagram of the LED drive circuit with the antihunt circuit shown in Fig. 2.
Figure 4 shows that the output voltage of electric ballast when different phase in Fig. 1.
Figure 5 shows that the output voltage of electric ballast when different phase in Fig. 3.
Figure 6 shows that the schematic diagram with the LED drive circuit of antihunt circuit that another embodiment of the utility model provides.
Figure 7 shows that the sequential chart between the both end voltage of charging capacitor in Fig. 3 and the voltage of control switch control end.
Embodiment
Figure 1 shows that existing LED drive circuit, in the circuit, the ac high frequency signal that electric ballast exports directly exports LED driver to after rectification.But because electric ballast is specially designed by fluorescent lamp, because fluorescent lamp needed to carry out glow discharge in the lighting stage, and glow discharge needs a very high voltage.Therefore, the output of electric ballast comprises two stages, the startup stage that one of them being, this stage electric ballast output HIGH voltage makes fluorescent lamp aura, and when after fluorescent lamp lighting, electric ballast enters steady-state process, export the normal working voltage of about 200V.
In FIG, electric ballast is directly connected with LED driver, electric ballast startup stage, due to LED load access failure, load no-output electric current, the now output of electric ballast to the capacitor charging being connected in parallel on rectification circuit output end, makes the voltage at electric capacity two ends raise rapidly and reaches the starting resistor of electric ballast after rectification.This just requires that LED driver has high voltage withstand class, can tolerate electric ballast startup stage the high pressure of a kilovolt nearly that exports.This brings huge challenge by the design of LED driver, and further, the voltage that different electric ballasts exports is different, and LED driver also has very large difficulty to the Design of Compatibility of electric ballast.
For solving the problem, the utility model provides a kind of and is applicable to the antihunt circuit 300 of electric ballast as input queued switches LED.Corresponding, the present embodiment also provides a kind of LED drive circuit comprising antihunt circuit 300.Be described in detail below with reference to the operation principle of LED drive circuit to antihunt circuit 300.But the utility model does not limit antihunt circuit 300 can only be applied to LED drive circuit.In other embodiment, antihunt circuit 300 is applicable to other circuit needing to suppress busbar voltage to raise in the short time.
As shown in Figure 3, the LED drive circuit with antihunt circuit that the present embodiment provides comprises electric ballast 100, rectification circuit 200, the electric capacity 400 being connected in parallel on rectification circuit 200 output and antihunt circuit 300.Because LED need adopt direct current signal to drive, therefore, the high frequency ac signal that electric ballast 100 exports forms DC signal output after rectification circuit 200 rectification.In the present embodiment, the full-bridge rectification that rectification circuit 200 is made up of four diodes.But the utility model is not limited in any way this.In other embodiment, rectification circuit 200 can be Half bridge rectifier.
As shown in Figure 2, antihunt circuit 300 comprises damping element 1, control circuit 2 and control switch 3.Damping element 1 is electrically connected DC bus.Control circuit 2 obtains supply power voltage from DC bus and is compared with threshold voltage by supply power voltage, and when supply power voltage is higher than threshold voltage, control circuit 2 exports the first control signal.In the present embodiment, control circuit 2 obtains supply power voltage by damping element 1 from DC bus.But the utility model is not limited in any way this.In other embodiment, control circuit 2 is connected with DC bus by a resistance R, thus obtains supply power voltage (as shown in Figure 6).Control switch 3 is electrically connected damping element 1 and control circuit 2 respectively, and damping element 1 is cut circuit by the first control signal that control switch 3 exports based on control circuit 2.
As shown in Figure 3, when control switch 3 closes, damping element 1 cuts circuit, electric capacity 400, forms loop between damping element 1 and control switch 3, and electric capacity 400 both end voltage can not continue to raise, thus reaches the effect suppressing DC bus-bar voltage to raise.Figure 4 shows that in existing LED driver, the output voltage of electric ballast when different phase.Figure 5 shows that the output voltage of electric ballast 100 when different phase after adding antihunt circuit 300 that the utility model provides.Comparison diagram 4 and Fig. 5, can significantly find out, increases after antihunt circuit 300, electric ballast 100 startup stage output voltage well suppressed, accordingly, the DC bus-bar voltage after rectification also will well be suppressed.
In the present embodiment, damping element 1 is power resistor.But the utility model is not limited in any way this.
In the present embodiment, control circuit 2 comprises comparator 21 and controller 22, the supply power voltage that one of them input input of comparator 21 obtains from DC bus, another input input voltage threshold value, output exports comparison signal to controller 22, and controller 22 exports first according to comparison signal and controls signal to control switch 3.In the present embodiment, controller 22 is also for driving the LED load of rear class.But the utility model is not limited in any way this.In other embodiment, controller 22 and LED driver can independently be arranged.
In the present embodiment, control switch 3 is NMOS tube and arranges with control circuit 2 is independent.But the utility model is not limited in any way this.For reducing the area shared by circuit board element, in other embodiment, control switch 3 and control circuit 2 can be integrated.
The drain electrode of NMOS tube and the output of damping element 1 are electrically connected, and grid and the control circuit 2 of NMOS tube are electrically connected, the source ground of NMOS tube.When the supply power voltage that comparator 21 inputs is greater than voltage threshold, comparator 21 exports first and controls signal to controller 22, and controller 22 exports the grid of high level to NMOS tube, and damping element 1 is cut circuit by NMOS tube conducting.But the particular type of the utility model to control switch 3 is not limited in any way.In other embodiment, control switch 3 can be NPN triode or other P type switching tube (as PMOS or PNP triode).When control switch 3 is NPN triode, circuit form is identical with the present embodiment, the position of NMOS tube is directly replaced with NPN triode, base stage and the controller 22 of NPN triode are electrically connected, the collector electrode of NPN triode and the output of damping element 1 are electrically connected, the grounded emitter of NPN triode.
But, when control switch 3 is P type switching tube, as shown in Figure 6, damping element 1 and control switch 3 transposition.Specifically, now, drain electrode (collector electrode) and the damping element 1 of P type switching tube are electrically connected, and the grid (base stage) of P type switching tube is connected with controller 22, and the source electrode (emitter) of P type switching tube connects DC bus.
After damping element 1 is cut circuit by control switch 3, LED load and DC bus are connected by controlling a switch by control circuit 2, and electric ballast 100 can continue to power to LED load.After LED load connects generation output current, the voltage at electric capacity 400 two ends is through filling while stablize gradually after putting, and DC bus-bar voltage reduces and the magnitude of voltage of the steady-state process that falls back gradually.Now, for improving the efficiency of circuit, namely improving the ratio between defeated power and input power, iting is desirable to reduce consumption unnecessary in circuit as far as possible, therefore, after generation output current is connected in load, damping element 1 is cut out circuit.
In the present embodiment, control circuit 2 also comprises timer 23, and when controller 22 exports the first control signal, timer 23 starts timing, and when the timing time threshold value time of advent, controller 22 exports the second control signal.Damping element 1 is cut out circuit by the second control signal that control switch 3 exports based on controller 22, damping element 1 no longer produces power consumption, greatly raises the efficiency.The t0 moment is controller 22 when exporting the first control signal in the figure 7, and the t1 moment is that LED load and DC bus are connected when producing output current, and time threshold is t1-t0.
In actual use, by the impact of external interference, the voltage of DC bus can change, and this change may cause the misoperation of comparator 21, thus has influence on the switching of control switch 3, and then affects the normal work of whole antihunt circuit 300.In order to prevent comparator 21 misoperation caused because of DC bus-bar voltage fluctuation, the antihunt circuit 300 that the utility model provides also comprises voltage stabilizing power supplying circuit 4.Voltage stabilizing power supplying circuit 4 exports control circuit 2 to after carrying out voltage stabilizing process to the supply power voltage got.
Voltage stabilizing power supplying circuit 4 comprises diode 41 and charging capacitor 42.The positive pole of diode 41 is connected with the output of damping element 1, and the negative pole of diode 41 is connected with one of them input of comparator 21 with charging capacitor 42 respectively.Electric ballast startup stage, DC bus-bar voltage is charged by damping element 1 and diode 41 pairs of charging capacitors 42, and the both end voltage Vcc of charging capacitor 42 reaches rapidly the starting resistor of control circuit 2, and control circuit 2 starts and starts working.In certain embodiments, the starting resistor of control circuit can be consistent with the threshold value set by comparator 21, namely, when the both end voltage Vcc of charging capacitor 42 reaches the threshold voltage set by comparator 21, control circuit 2 is by antihunt circuit incision (i.e. switch 3 conducting).Simultaneously, threshold value set by comparator 21 also can higher than the starting resistor of control circuit, namely when the rising continuation rising of both end voltage Vcc along with busbar voltage of filling an electric capacity 42, after reaching the threshold value set by comparator 21, antihunt circuit is cut by control circuit 2.This setting can simplify circuit design greatly.But the utility model is not limited in any way this.In other embodiment, can adopt independently power supply circuits to start control circuit 2.
When after antihunt circuit incision (i.e. switching tube 3 conducting), owing to there is diode 41, the voltage vcc at charging capacitor 42 two ends can not be discharged by diode 41, and now the voltage of Vcc point remains stable.The voltage of Vcc point ensure that the normal work of comparator 21, effectively avoids the misoperation that comparator 21 occurs.As shown in Figure 7, stable Vcc voltage makes the voltage Vg exported on control switch 3 grid within a period of time, remain stable, and control switch 3 is stable to be switched.
In sum, the antihunt circuit 300 that the utility model provides and there is the LED drive circuit of antihunt circuit, when DC bus export high pressure time (as electric ballast startup stage), by control switch 3, damping element 1 is cut circuit, the high voltage realized DC bus exports suppresses, reduce the voltage withstand class of late-class circuit, effectively avoid because the damage caused by high pressure maybe can not work.Concrete implementation is: control circuit 2 obtains supply power voltage from DC bus, and when supply power voltage is higher than the voltage threshold set, control circuit 2 exports the first control signal Closed control switch 3.Control switch 3 closes, and the damping element 1 be connected with DC bus will be cut circuit, and damping element 1 effectively suppresses the continuation of busbar voltage to raise, and reaches protection late-class circuit and makes it enter normal operating conditions.
In actual use, after load and DC bus are connected and have output current, the voltage on DC bus can reduce gradually.Therefore, for improving the efficiency of circuit, need in time damping element 1 to be cut out circuit after load is connected.In the present embodiment, when the first control signal Closed control switch 3, timer 23 starts timing, after reaching time threshold, control circuit 2 exports the second control signal closing control switch 3, in time damping element 1 is cut out circuit, eliminate the power consumption on damping element 1, improve the power output of circuit.
Although the utility model discloses as above by preferred embodiment; but and be not used to limit the utility model; anyly know this those skilled in the art; not departing from spirit and scope of the present utility model; can do a little change and retouching, therefore protection range of the present utility model is when being as the criterion depending on claims scope required for protection.
Claims (10)
1. an antihunt circuit, is characterized in that, comprising:
Damping element, is electrically connected DC bus;
Control circuit, obtains supply power voltage from DC bus and is compared with threshold voltage by supply power voltage, and when supply power voltage is higher than threshold voltage, described control circuit exports the first control signal;
Control switch, is electrically connected described damping element and control circuit respectively, and described damping element is cut circuit by the first control signal that described control switch exports based on described control circuit.
2. antihunt circuit according to claim 1, it is characterized in that, described control circuit comprises comparator and controller, one of them input input supply power voltage of described comparator, another input input voltage threshold value, output exports comparison signal to controller, and controller exports first according to comparison signal and controls signal to control switch.
3. antihunt circuit according to claim 2, it is characterized in that, described control circuit also comprises timer, when described controller exports the first control signal, timer starts timing, when the timing time threshold value time of advent, described controller exports the second control signal, and damping element is cut out circuit by the second control signal that control switch exports based on control circuit.
4. antihunt circuit according to claim 1, is characterized in that, described antihunt circuit also comprises voltage stabilizing power supplying circuit, and described voltage stabilizing power supplying circuit exports control circuit to after carrying out voltage stabilizing process to supply power voltage.
5. antihunt circuit according to claim 4, it is characterized in that, described voltage stabilizing power supplying circuit comprises diode and charging capacitor, the positive pole of described diode is electrically connected the output of damping element, the negative pole of diode is connected with control circuit with charging capacitor respectively, DC bus-bar voltage is by damping element and the charging of diode pair charging capacitor, and the voltage at charging capacitor two ends exports control circuit to.
6. antihunt circuit according to claim 1, is characterized in that, described damping element is power resistor.
7. antihunt circuit according to claim 1, it is characterized in that, described control switch is NMOS tube or NPN triode, when control switch is NMOS tube, the drain electrode of NMOS tube and the output of damping element are electrically connected, the grid of NMOS tube and control circuit are electrically connected, the source ground of NMOS tube; When control switch is NPN triode, the collector electrode of NPN triode and the output of damping element are electrically connected, and the base stage of NPN triode and control circuit are electrically connected, the grounded emitter of NPN triode.
8. antihunt circuit according to claim 1, it is characterized in that, described control switch is PMOS or PNP triode, when control switch is PMOS, the drain electrode of PMOS and damping element are electrically connected, the grid of PMOS and control circuit are electrically connected, and the source electrode of PMOS connects DC bus; When control switch is PNP triode, the collector electrode of PNP triode and the output of damping element are electrically connected, and the base stage of PNP triode and control circuit are electrically connected, and the emitter of PNP triode connects DC bus.
9. there is a LED drive circuit for antihunt circuit, it is characterized in that, comprise electric ballast, rectification circuit, be connected in parallel on the electric capacity of rectification circuit output end and the antihunt circuit as described in any one of claim 1 ~ 8.
10. the LED drive circuit with antihunt circuit according to claim 9, is characterized in that, described rectification circuit is full-bridge rectification or Half bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520278598.0U CN204578852U (en) | 2015-04-30 | 2015-04-30 | Antihunt circuit and there is the LED drive circuit of antihunt circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520278598.0U CN204578852U (en) | 2015-04-30 | 2015-04-30 | Antihunt circuit and there is the LED drive circuit of antihunt circuit |
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|---|---|
| CN204578852U true CN204578852U (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520278598.0U Active CN204578852U (en) | 2015-04-30 | 2015-04-30 | Antihunt circuit and there is the LED drive circuit of antihunt circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104797058A (en) * | 2015-04-30 | 2015-07-22 | 杰华特微电子（杭州）有限公司 | Damping circuit and LED driving circuit with same |
| CN106102253A (en) * | 2016-08-02 | 2016-11-09 | 欧普照明股份有限公司 | Led drive circuit and led lamp tube |
-
2015
- 2015-04-30 CN CN201520278598.0U patent/CN204578852U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104797058A (en) * | 2015-04-30 | 2015-07-22 | 杰华特微电子（杭州）有限公司 | Damping circuit and LED driving circuit with same |
| CN106102253A (en) * | 2016-08-02 | 2016-11-09 | 欧普照明股份有限公司 | Led drive circuit and led lamp tube |
| CN106102253B (en) * | 2016-08-02 | 2019-06-25 | 欧普照明股份有限公司 | LED drive circuit and LED lamp tube |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |
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