CN108882463B - AC/DC switching circuit applied to lamp set - Google Patents
AC/DC switching circuit applied to lamp set Download PDFInfo
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- CN108882463B CN108882463B CN201810863917.2A CN201810863917A CN108882463B CN 108882463 B CN108882463 B CN 108882463B CN 201810863917 A CN201810863917 A CN 201810863917A CN 108882463 B CN108882463 B CN 108882463B
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- 239000003990 capacitor Substances 0.000 claims description 38
- 230000003287 optical effect Effects 0.000 claims description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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Abstract
The invention provides an alternating current-direct current switching circuit applied to a lamp set, which comprises a voltage source, a power supply end, a first switching tube, a switch, a second switching tube, a charge-discharge module, a switching module, a third switching tube, a voltage output end and an LED lamp set, wherein the voltage source is connected with the first switching tube; the voltage source is electrically connected with a first port of the first switching tube, and a third port of the second switching tube is connected between the switch and the power supply end; the charging and discharging module is connected with the power supply end; the fourth port of the second switching tube is connected between the charge-discharge module and the power supply end; the voltage output end is connected with the LED lamp group; the voltage output end is connected with the power supply end through a control device; the third switching tube comprises a sixth port, a seventh port and an eighth port; the sixth port is connected with a power supply end, the seventh port is connected between the power supply end and the voltage output end, and the eighth port is grounded; by the technical scheme, when the lamp bank is switched to direct current input, the lamp bank can send out set brightness.
Description
Technical Field
The invention relates to the field of lamp functions, in particular to an alternating current-direct current switching circuit applied to a lamp set.
Background
In the use of the lamp in the prior art, the use effect of the lamp set in an emergency state is often required to be considered. When no emergency condition occurs, the alternating current is input, and the lamp group is switched to the direct current input after being regulated to the fixed brightness through the Touch Dim, the brightness of the lamp group is the same as the brightness of the alternating current input. However, if the ac power is not outputted when the ac power is on standby, the dc power is not outputted; or when the alternating current input is at the minimum brightness, the direct current input is also at the minimum brightness, so that the control of the luminous effect of the lamp set in an emergency state is not facilitated, and the requirements of people on the lamp set in the emergency state cannot be met due to the fact that the lamp is not on or the brightness is low.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an alternating current-direct current switching circuit applied to a lamp group, which can send out set brightness when the lamp group is switched to direct current input.
In order to solve the technical problems, the invention provides an alternating current-direct current switching circuit applied to a lamp set, which comprises a voltage source, a power supply end, a first switch tube, a switch, a second switch tube, a charge-discharge module, a switch module, a third switch tube, a voltage output end and an LED lamp set;
the voltage source is electrically connected with a first port of the first switching tube, a second port of the first switching tube is connected with one end of the switch, and the other end of the switch is connected between the power supply end and the grounding end; the third port of the second switching tube is connected between the switch and the power supply end; the charging and discharging module is connected with the power supply end; the fourth port of the second switching tube is connected between the charge-discharge module and the power supply end, and the fifth port of the second switching tube is grounded; the voltage output end is connected with the LED lamp group;
the switch module is connected with the charge-discharge module; the voltage output end is connected with the power supply end through a control device; the third switching tube comprises a sixth port, a seventh port and an eighth port; the sixth port is connected with the power supply end, the seventh port is connected between the power supply end and the voltage output end, and the eighth port is grounded;
the switching module is connected with the PWM signal end;
when the voltage source outputs alternating current, the first port intermittently receives high level, and the first port intermittently receives low level; when the first port receives a high level, the first switching tube is conducted, so that the conduction level of one end of the switch connected with the power supply end is pulled down, the third port receives a low level, the second switching tube is not conducted, and the charging and discharging module is charged; when the first port receives a low level, the first switching tube is not conducted, so that one end of the switch connected with the power supply end is not conducted, the third port receives a high level, the second switching tube is conducted, and the charging and discharging module discharges; during the period that the voltage source outputs alternating current, the switching module is closed, the PWM signal is not shielded, the sixth port receives high level from the power supply end, the third switching tube is conducted, and the voltage output end does not have voltage output;
when the voltage source outputs direct current, the first port continuously receives high level, the first switching tube is conducted, the second switching tube is not conducted, the charging and discharging module is continuously charged to be full, the charging and discharging module forms a loop to provide high level to the switching module, the switching module is conducted, PWM signals are shielded, the sixth port receives low level, the third switching tube is not conducted, the control device outputs set voltage to the voltage output end, and the LED lamp group is lightened with set brightness when direct current is input.
In a preferred embodiment, the charge-discharge module includes a first capacitor, a second capacitor, a fifth resistor, a switching diode, a zener diode, a sixth resistor, and a first resistor connected in parallel; the switch module comprises a fourth switch tube and a fifth switch tube.
In a preferred embodiment, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are specifically a first triode, a second triode, a third triode, a fourth triode and a fifth triode; the switch is specifically a photoelectric coupler, and the photoelectric coupler comprises an electric signal access end and an electric signal output end.
In a preferred embodiment, the first port is a base of the first triode, and the second port is an emitter of the first triode; a second resistor is connected between the first port and the voltage source; the second port is connected with the electric signal access end, and the photoelectric coupler converts an electric signal into an optical signal and then into an electric signal so that the electric signal output end is electrified.
In a preferred embodiment, the anodes of the first capacitor and the second capacitor are connected with the power supply end; the third port is the base electrode of the second triode, the fourth port is the collector electrode of the second triode, and the fifth port is the emitter electrode of the second triode; the fourth port is connected between the anodes of the first capacitor and the second capacitor and the power supply end.
In a preferred embodiment, the bases of the fourth triode and the fifth triode and the first resistor are connected in series to two ends of the second capacitor; the collector electrode of the fourth triode is connected with the power supply end, the emitter electrode of the fourth triode is connected with the collector electrode of the fifth triode, and the emitter electrode of the fifth triode is grounded; the PWM signal end is connected between the emitter of the fourth triode and the collector of the fifth triode.
In a preferred embodiment, the sixth port is a base of the third triode, the seventh port is a collector of the third triode, and the eighth port is an emitter of the third triode; the base electrode of the third triode is connected between the collector electrode of the fourth triode and the power supply end; a control device is further arranged between the collector electrode of the third triode and the power supply end; the control device comprises a control input end and a control output end, wherein the control input end is connected with the power supply end, the control output end is connected with the collector electrode of the third triode, and a third resistor is further connected between the control output end and the collector electrode of the third triode.
In a preferred embodiment, the voltage source outputs an alternating current, when the voltage on the first resistor is greater than a set value, and the base electrode of the first triode receives a high level, the first triode is conducted, so that the electric signal output end of the photoelectric coupler is conducted, the level on the base electrode of the second triode is pulled down, the second triode is not conducted, and the first capacitor and the second capacitor are charged; when the voltage on the first resistor is lower than a set value, the base electrode of the first triode is not conducted when receiving a low level, so that the electric signal output end of the photoelectric coupler is not conducted, the base electrode of the second triode receives a high level from the power supply end, the second triode is conducted, and the first capacitor and the second capacitor discharge through a fifth resistor and a switching diode;
during the period that the voltage source outputs alternating current, the voltage on the first resistor is zero, so that the base electrodes of the fourth triode and the fifth triode receive low level, the fourth triode and the fifth triode are not conducted, and then the PWM signal end is not grounded and the PWM signal end is shielded; and the base electrode of the third triode receives high level from the power supply end, and the third triode is conducted, so that an electric signal output by the control output end is pulled down by the grounded emitter electrode in the third triode, and the voltage output end has no voltage output.
In a preferred embodiment, the voltage source outputs a direct current, when the voltage on the first resistor is continuously greater than a set value, the base of the first triode continuously receives a high level, the first triode is conducted, the electric signal output end of the photoelectric coupler is conducted so that the level on the base of the second triode connected with the power supply end is pulled down, the second triode is not conducted, the first capacitor and the second capacitor are continuously charged to be full, so that the zener diode ZD11 is conducted, and therefore the power supply end provides a high level to the base of the fourth triode and the base of the fifth triode through the fourth resistor, the fifth resistor, the zener diode, the sixth resistor and the first resistor, the fourth triode and the fifth triode are conducted, the PWM signal of the PWM signal end is connected to the ground through the fifth triode, and the PWM signal is shielded; the base electrode of the third triode connected with the power supply end is grounded, namely receives low level, the third triode is not conducted, the electric signal output by the control output end is not intercepted, the control output end outputs set voltage to the voltage output end, and the voltage output end outputs voltage. Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the invention provides an AC/DC switching circuit applied to a lamp bank, which realizes that the luminous brightness of the lamp bank is different from the luminous brightness of the lamp bank when the lamp bank is switched to DC input in an emergency state; when direct current is input, the lamp group emits light according to the set brightness, so that the condition that the light-emitting brightness of the lamp group is the same as the brightness of alternating current in standby during direct current input, namely, the condition that the lamp group is not bright or the brightness is low is avoided, and the emergency turntable is unfavorable for control under the emergency turntable. The circuit can drive the adjustable light to any brightness when the alternating current is input, and can reach the same set brightness when the direct current is switched to the direct current input; in addition, when the AC input is in the standby state, the same set brightness can be achieved by switching to the DC input state.
Drawings
Fig. 1 is a schematic diagram of an ac/dc switching circuit applied to a lamp set according to a preferred embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
Referring TO fig. 1, the ac/dc switching circuit for a lamp set specifically includes a voltage source, a power supply end TO12V, a first switching tube, a switch, a second switching tube, a charge/discharge module, a switching module, a third switching tube, a voltage output end Vi, and an LED lamp set; the LED lamp group is not shown in fig. 1.
The connection relation among the elements is specifically as follows: the voltage source is electrically connected with a first port of the first switching tube, a second port of the first switching tube is connected with one end of the switch, and the other end of the switch is connected between a power supply end TO12V and a grounding end; the third port of the second switching tube is connected between the switch and the power supply end TO12V; the charging and discharging module is connected with the power supply end TO12V; the fourth port of the second switching tube is connected between the charge-discharge module and the power supply end TO12V, and the fifth port of the second switching tube is grounded; the voltage output end Vi is connected with the LED lamp group;
the switch module is connected with the charge-discharge module; the voltage output end Vi is connected with the power supply end TO12V through a control device U6; the third switching tube comprises a sixth port, a seventh port and an eighth port; the sixth port is connected with the power supply end TO12V, the seventh port is connected between the power supply end TO12V and the voltage output end Vi, and the eighth port is grounded; the switching module is characterized by further comprising a PWM signal end, wherein the PWM signal end is connected with the switching module.
The working principle of the circuit is briefly described by applying the connection relation: when the voltage source outputs alternating current, the first port intermittently receives high level, and the first port intermittently receives low level; when the first port receives a high level, the first switching tube is conducted, so that one end conduction level of the switch connected with the power supply end TO12V is pulled down, the third port receives a low level, the second switching tube is not conducted, and the charging and discharging module is charged; when the first port receives a low level, the first switching tube is not conducted, so that one end of the switch, which is connected with the power supply end TO12V, is not conducted, the third port receives a high level, the second switching tube is conducted, and the charging and discharging module discharges; during the period that the voltage source outputs alternating current, the switching module is closed, the PWM signal is not shielded, the sixth port receives a high level from the power supply end TO12V, the third switching tube is conducted, and the voltage output end Vi has no voltage output;
when the voltage source outputs direct current, the first port continuously receives high level, the first switching tube is conducted, the second switching tube is not conducted, the charging and discharging module is continuously charged to be full, the charging and discharging module forms a loop to provide high level to the switching module, the switching module is conducted, PWM signals are shielded, the sixth port receives low level, the third switching tube is not conducted, the control device U6 outputs set voltage to the voltage output end Vi, and the LED lamp group is lightened with set brightness when direct current is input.
Specifically, the charge-discharge module includes a first capacitor C31, a second capacitor C32, a fifth resistor R87, a switching diode D21, a zener diode ZD11, a sixth resistor R88, and a first resistor R89 connected in parallel; the switch module comprises a fourth switch tube and a fifth switch tube; in this embodiment, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, and the fifth switch tube are specifically a first triode Q31, a second triode Q32, a third triode Q35, a fourth triode Q33, and a fifth triode Q34; the switch is specifically a photoelectric coupler U5, and the photoelectric coupler U5 comprises an electric signal access end and an electric signal output end; the electric signal access end is a first pin and a second pin in the photoelectric coupler U5, and the electric signal output end is a third pin and a fourth pin in the photoelectric coupler U5. Other switching tubes and switches can be used, which are simple alternatives, and the protection scope of the invention cannot be limited by this.
The following describes the specific connection relationship of the circuit with reference to the specific structure of each component: the first port is the base electrode of the first triode Q31, and the second port is the emitter electrode of the first triode Q31; a second resistor R82 is connected between the first port and the voltage source; the second port is connected with the electric signal access end, and the photoelectric coupler U5 converts an electric signal into an optical signal and then into an electric signal so that the electric signal output end is electrified.
The anodes of the first capacitor C31 and the second capacitor C32 are connected with the power supply end TO12V; the third port is the base electrode of the second triode Q32, the fourth port is the collector electrode of the second triode Q32, and the fifth port is the emitter electrode of the second triode Q32; the fourth port is connected between the anodes of the first capacitor C31 and the second capacitor C32 and the power supply terminal TO 12V.
The bases of the fourth triode Q33 and the fifth triode Q34 and the first resistor R89 are connected in series with the two ends of the second capacitor C32; the collector of the fourth triode Q33 is connected with the power supply end TO12V, the emitter of the fourth triode Q33 is connected with the collector of the fifth triode Q34, and the emitter of the fifth triode Q34 is grounded; the PWM signal terminal is connected between the emitter of the fourth transistor Q33 and the collector of the fifth transistor Q34.
The sixth port is the base electrode of the third triode Q35, the seventh port is the collector electrode of the third triode Q35, and the eighth port is the emitter electrode of the third triode Q35; the base electrode of the third triode Q35 is connected between the collector electrode of the fourth triode Q33 and the power supply end TO12V; the control device is further included between the collector of the third triode Q35 and the power supply terminal TO12V; the control device comprises a control input end Vin and a control output end Vout, wherein the control input end Vin is connected with the power supply end TO12V, the control output end Vout is connected with a collector of the third triode Q35, and a third resistor R96 is further connected between the control output end Vout and the collector of the third triode Q35.
The invention provides an AC/DC switching circuit applied to a lamp group, which has the following specific working principle: when the voltage on the second resistor R82 is greater than a set value and the base electrode of the first triode Q31 receives a high level, the first triode Q31 is conducted, the electric signal output end of the photoelectric coupler U5 is conducted, the level on the base electrode of the second triode Q32 is pulled down, the second triode Q32 is not conducted, and the first capacitor C31 and the second capacitor C32 are charged; when the voltage of the second resistor R82 is lower than the set value, the base electrode of the first triode Q31 receives a low level, the first triode Q31 is not conducted, so that the electric signal output end of the photoelectric coupler U5 is not conducted, the base electrode of the second triode Q32 receives a high level from the power supply end TO12V, the second triode Q32 is conducted, and the first capacitor C31 and the second capacitor C32 discharge through the fifth resistor R87 and the switching diode D21;
during the period when the voltage source outputs alternating current, the voltage on the first resistor R89 is zero due to the clamping action of the zener diode ZD11, so that the bases of the fourth triode Q33 and the fifth triode Q34 receive low level, the fourth triode Q33 and the fifth triode Q34 are not conducted, the PWM signal end is not grounded, and the PWM signal end is not shielded; the base of the third triode Q35 receives a high level from the power supply terminal TO12V, and the third triode Q35 is turned on, so that the electric signal output by the control output terminal Vout is pulled down by the grounded emitter of the third triode Q35, so that the voltage output terminal Vi has no voltage output.
The voltage source outputs direct current, when the voltage on the second resistor R82 is continuously greater than a set value, the base electrode of the first triode Q31 continuously receives high level, the first triode Q31 is conducted, the electric signal output end of the photoelectric coupler U5 is conducted so that the level on the base electrode of the second triode Q32 connected with the power supply end TO12V is pulled down, the second triode Q32 is not conducted, the first capacitor C31 and the second capacitor C32 are continuously charged TO be full, the voltage stabilizing diode ZD11 is conducted, and accordingly the power supply end TO12V forms a loop with the base electrode of the fourth triode Q33, the base electrode of the fifth triode Q34 through the fourth resistor R86, the fifth resistor R87, the voltage stabilizing diode ZD11, the sixth resistor R88 and the first resistor R89, the fourth triode Q33 and the fifth triode Q34 are conducted, the signal of the signal end is accessed TO the ground through the fifth triode Q34, and the PWM signal is shielded; the base of the third triode Q35 connected TO the power supply terminal TO12V is grounded, i.e. receives a low level, the third triode Q35 is not turned on, the electric signal output by the control output terminal Vout is not intercepted, the control output terminal Vout outputs a set voltage TO the voltage output terminal Vi, and the voltage output terminal Vi outputs a voltage.
Through the AC/DC switching circuit applied to the lamp group, when the lamp group is switched to DC input in an emergency state, the luminous brightness of the lamp group is different from the luminous brightness of the lamp group in AC input; when direct current is input, the lamp group emits light according to the set brightness, so that the condition that the light-emitting brightness of the lamp group is the same as the brightness of alternating current in standby during direct current input, namely, the condition that the lamp group is not bright or the brightness is low is avoided, and the emergency turntable is unfavorable for control under the emergency turntable. The circuit can drive the adjustable light to any brightness when the alternating current is input, and can reach the same set brightness when the direct current is switched to the direct current input; in addition, when the AC input is in the standby state, the same set brightness can be achieved by switching to the DC input state.
The foregoing is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art will be able to make insubstantial modifications of the present invention within the scope of the present invention disclosed herein by this concept, which falls within the actions of invading the protection scope of the present invention.
Claims (9)
1. The alternating current-direct current switching circuit applied to the lamp set is characterized by comprising a voltage source, a power supply end, a first switching tube, a switch, a second switching tube, a charge-discharge module, a switching module, a third switching tube, a voltage output end and an LED lamp set;
the voltage source is electrically connected with a first port of the first switching tube, a second port of the first switching tube is connected with one end of the switch, and the other end of the switch is connected between the power supply end and the grounding end; the third port of the second switching tube is connected between the switch and the power supply end; the charging and discharging module is connected with the power supply end; the fourth port of the second switching tube is connected between the charge-discharge module and the power supply end, and the fifth port of the second switching tube is grounded; the voltage output end is connected with the LED lamp group;
the switch module is connected with the charge-discharge module; the voltage output end is connected with the power supply end through a control device; the third switching tube comprises a sixth port, a seventh port and an eighth port; the sixth port is connected with the power supply end, the seventh port is connected between the power supply end and the voltage output end, and the eighth port is grounded;
the switching module is connected with the PWM signal end;
when the voltage source outputs alternating current, the first port intermittently receives high level, and the first port intermittently receives low level; when the first port receives a high level, the first switching tube is conducted, so that the conduction level of one end of the switch connected with the power supply end is pulled down, the third port receives a low level, the second switching tube is not conducted, and the charging and discharging module is charged; when the first port receives a low level, the first switching tube is not conducted, so that one end of the switch connected with the power supply end is not conducted, the third port receives a high level, the second switching tube is conducted, and the charging and discharging module discharges; during the period that the voltage source outputs alternating current, the switching module is closed, the PWM signal is not shielded, the sixth port receives high level from the power supply end, the third switching tube is conducted, and the voltage output end does not have voltage output;
when the voltage source outputs direct current, the first port continuously receives high level, the first switching tube is conducted, the second switching tube is not conducted, the charging and discharging module is continuously charged to be full, the charging and discharging module forms a loop to provide high level to the switching module, the switching module is conducted, PWM signals are shielded, the sixth port receives low level, the third switching tube is not conducted, the control device outputs set voltage to the voltage output end, and the LED lamp group is lightened with set brightness when direct current is input.
2. The ac/dc switching circuit of claim 1 wherein the charge/discharge module comprises a first capacitor, a second capacitor, a fifth resistor, a switching diode, a zener diode, a sixth resistor, and a first resistor connected in parallel; the switch module comprises a fourth switch tube and a fifth switch tube.
3. The ac/dc switching circuit of claim 2 wherein said first, second, third, fourth, and fifth switching transistors are specifically first, second, third, fourth, and fifth transistors; the switch is specifically a photoelectric coupler, and the photoelectric coupler comprises an electric signal access end and an electric signal output end.
4. The ac/dc switching circuit of claim 3 wherein said first port is a base of said first transistor and said second port is an emitter of said first transistor; a second resistor is connected between the first port and the voltage source; the second port is connected with the electric signal access end, and the photoelectric coupler converts an electric signal into an optical signal and then into an electric signal so that the electric signal output end is electrified.
5. The ac/dc switching circuit of claim 4 wherein the anodes of said first and second capacitors are connected to said power supply terminal; the third port is the base electrode of the second triode, the fourth port is the collector electrode of the second triode, and the fifth port is the emitter electrode of the second triode; the fourth port is connected between the anodes of the first capacitor and the second capacitor and the power supply end.
6. The ac/dc switching circuit of claim 5 wherein the bases of the fourth and fifth transistors and the first resistor are connected in series across the second capacitor; the collector electrode of the fourth triode is connected with the power supply end, the emitter electrode of the fourth triode is connected with the collector electrode of the fifth triode, and the emitter electrode of the fifth triode is grounded; the PWM signal end is connected between the emitter of the fourth triode and the collector of the fifth triode.
7. The ac/dc switching circuit of claim 6 wherein said sixth port is a base of said third transistor, said seventh port is a collector of said third transistor, and said eighth port is an emitter of said third transistor; the base electrode of the third triode is connected between the collector electrode of the fourth triode and the power supply end; a control device is further arranged between the collector electrode of the third triode and the power supply end; the control device comprises a control input end and a control output end, wherein the control input end is connected with the power supply end, the control output end is connected with the collector electrode of the third triode, and a third resistor is further connected between the control output end and the collector electrode of the third triode.
8. The ac/dc switching circuit of claim 7 wherein the voltage source outputs ac power, and when the voltage on the first resistor is greater than a set value and the base of the first transistor receives a high level, the first transistor is turned on, so that the electrical signal output terminal of the photocoupler is turned on, so that the level on the base of the second transistor is pulled down, the second transistor is turned off, and the first capacitor and the second capacitor are charged; when the voltage on the first resistor is lower than a set value, the base electrode of the first triode is not conducted when receiving a low level, so that the electric signal output end of the photoelectric coupler is not conducted, the base electrode of the second triode receives a high level from the power supply end, the second triode is conducted, and the first capacitor and the second capacitor discharge through a fifth resistor and a switching diode;
during the period that the voltage source outputs alternating current, the voltage on the first resistor is zero, so that the base electrodes of the fourth triode and the fifth triode receive low level, the fourth triode and the fifth triode are not conducted, and then the PWM signal end is not grounded and the PWM signal end is shielded; and the base electrode of the third triode receives high level from the power supply end, and the third triode is conducted, so that an electric signal output by the control output end is pulled down by the grounded emitter electrode in the third triode, and the voltage output end has no voltage output.
9. The ac/dc switching circuit of claim 7 wherein the voltage source outputs dc power, when the voltage on the first resistor is continuously greater than a set value, the base of the first transistor continuously receives a high level, the first transistor is turned on, the electrical signal output terminal of the photocoupler is turned on to enable the level on the base of the second transistor connected to the power supply terminal to be pulled down, the second transistor is turned off, the first capacitor and the second capacitor continuously charge to be full, so that the zener diode ZD11 is turned on, and thus the power supply terminal provides a high level to the base of the fourth transistor, the base of the fifth transistor, the fourth transistor and the fifth transistor through a fourth resistor, a fifth resistor, a PWM signal of the PWM signal terminal is connected to ground through the fifth transistor, and the PWM signal is shielded; the base electrode of the third triode connected with the power supply end is grounded, namely receives low level, the third triode is not conducted, the electric signal output by the control output end is not intercepted, the control output end outputs set voltage to the voltage output end, and the voltage output end outputs voltage.
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| CN201810863917.2A CN108882463B (en) | 2018-08-01 | 2018-08-01 | AC/DC switching circuit applied to lamp set |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510609A (en) * | 2011-10-21 | 2012-06-20 | 宁顺卫 | System and method with common and emergency LED (light emitting diode) intelligent illumination |
| CN102595726A (en) * | 2012-02-14 | 2012-07-18 | 深圳市讯宇创科技有限公司 | Emergency lighting circuit and emergency lighting system |
| CN103151224A (en) * | 2013-02-07 | 2013-06-12 | 滁州学院 | Smooth switching control device and control method of dual-coil bi-state permanent magnetic contactor |
| CN104184205A (en) * | 2013-05-23 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Power switching circuit and lighting equipment |
| CN204598424U (en) * | 2015-05-18 | 2015-08-26 | 深圳市垅运照明电器有限公司 | A kind of LED normal illumination and emergency lighting integrated device |
| CN205196008U (en) * | 2015-12-09 | 2016-04-27 | 麦剑源 | Novel intelligence light source actuating system |
| CN206442562U (en) * | 2017-02-21 | 2017-08-25 | 四川建筑职业技术学院 | A kind of Ground Connection in Intelligent Building illuminator |
| CN107124033A (en) * | 2017-05-22 | 2017-09-01 | 合肥联信电源有限公司 | A kind of emergency power system for exporting switching free of discontinuities |
| CN107580393A (en) * | 2017-09-25 | 2018-01-12 | 珠海格力电器股份有限公司 | L ED driving power supply and lamp |
-
2018
- 2018-08-01 CN CN201810863917.2A patent/CN108882463B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510609A (en) * | 2011-10-21 | 2012-06-20 | 宁顺卫 | System and method with common and emergency LED (light emitting diode) intelligent illumination |
| CN102595726A (en) * | 2012-02-14 | 2012-07-18 | 深圳市讯宇创科技有限公司 | Emergency lighting circuit and emergency lighting system |
| CN103151224A (en) * | 2013-02-07 | 2013-06-12 | 滁州学院 | Smooth switching control device and control method of dual-coil bi-state permanent magnetic contactor |
| CN104184205A (en) * | 2013-05-23 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Power switching circuit and lighting equipment |
| CN204598424U (en) * | 2015-05-18 | 2015-08-26 | 深圳市垅运照明电器有限公司 | A kind of LED normal illumination and emergency lighting integrated device |
| CN205196008U (en) * | 2015-12-09 | 2016-04-27 | 麦剑源 | Novel intelligence light source actuating system |
| CN206442562U (en) * | 2017-02-21 | 2017-08-25 | 四川建筑职业技术学院 | A kind of Ground Connection in Intelligent Building illuminator |
| CN107124033A (en) * | 2017-05-22 | 2017-09-01 | 合肥联信电源有限公司 | A kind of emergency power system for exporting switching free of discontinuities |
| CN107580393A (en) * | 2017-09-25 | 2018-01-12 | 珠海格力电器股份有限公司 | L ED driving power supply and lamp |
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| CN108882463A (en) | 2018-11-23 |
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