CN217037155U - Shutdown circuit applied to driving power supply and driving power supply - Google Patents
Shutdown circuit applied to driving power supply and driving power supply Download PDFInfo
- Publication number
- CN217037155U CN217037155U CN202220028823.5U CN202220028823U CN217037155U CN 217037155 U CN217037155 U CN 217037155U CN 202220028823 U CN202220028823 U CN 202220028823U CN 217037155 U CN217037155 U CN 217037155U
- Authority
- CN
- China
- Prior art keywords
- resistor
- power supply
- unit
- control unit
- driving power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to a shutdown circuit applied to a driving power supply and the driving power supply, comprising: the device comprises a detection judgment unit, an isolation unit, a drive control unit and a switch unit; the detection judging unit is used for detecting the input signal, judging and processing the input signal and outputting a comparison signal; the isolation unit is connected with the detection judgment unit and is used for isolating the comparison signal output by the detection judgment unit from the driving signal of the switch unit; the drive control unit is connected with the isolation unit and used for controlling the drive of the switch unit to be switched on or switched off; the switch unit is connected with the drive control unit and is used for controlling the positive output line of the drive power supply to be switched on or switched off. According to the utility model, the turn-off circuit is arranged on the positive output line of the driving power supply, so that the positive output line can be really disconnected, and thus the lamp bead is completely turned off, and the lamp bead is prevented from being slightly bright.
Description
Technical Field
The present invention relates to the field of power supply technologies, and in particular, to a shutdown circuit and a driving power supply for a driving power supply.
Background
In lighting applications, with the expansion of market scale, in order to meet the requirements of various lighting occasions, lighting systems are also developing towards automation and intelligent control, and various dimmable power supplies according to the environment and user requirements are also rapidly developing. The dimming power supply is divided into a dimming non-turn-off mode and a dimming turn-off mode. With the attention of human beings on environmental protection and energy conservation and the requirements of various application occasions, the demand of the power supply which can be adjusted and turned off is increasingly strong, and the power supply which is not turned off in the prior art is gradually eliminated. The non-isolated power supply has the characteristics of low cost, high efficiency, small size and the like, is favored by various large manufacturers, is rapidly developed in recent years, and is widely applied to the fields of industrial illumination, plant illumination and the like. In the non-isolated power supply, dimming turn-off is realized by controlling the BUCK circuit IC not to work.
The market of UV LEDs has been kept growing at a very high speed in recent years, and products are widely applied to the fields of printing, furniture coating, spray painting, industrial printers, rotary machines, photocuring, blasting machines, screen printing machines, optical fiber communication, electronics, textiles, medical treatment and the like. The requirements of the UV industry on power supplies are fast turn-off, fast response, dimmable turn-off, and the like. The current method for controlling the turn-off in the UV industry is to control the power output end by an external relay.
However, the existing power shutdown circuit technology has the following disadvantages:
1. because the positive line of the non-isolated power supply output is not isolated, when the BUCK circuit IC is controlled not to work under the condition of not connecting a ground line, the output is cut off because a lamp load does not have a loop; however, after the ground wire is connected, the output positive wire and the Y capacitor, and junction capacitors between the lamp beads and the lamp plates form a loop, so that the lamp beads are slightly bright, and the effect of complete turn-off cannot be realized.
2. The method of utilizing the external relay to control the output to be turned off in the UV industry has high cost and also greatly occupies space.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a shutdown circuit and a driving power supply for a driving power supply, which are provided to overcome the drawbacks of the prior art.
The technical scheme adopted by the utility model for solving the technical problem is as follows: a shutdown circuit for a drive power supply is constructed, comprising: the device comprises a detection judgment unit, an isolation unit, a drive control unit and a switch unit;
the detection judgment unit is used for detecting an input signal, performing judgment processing based on the input signal and outputting a comparison signal;
the isolation unit is connected with the detection judgment unit and is used for isolating the comparison signal output by the detection judgment unit from the driving signal of the switch unit;
the drive control unit is connected with the isolation unit and used for controlling the drive of the switch unit to be switched on or switched off;
the switch unit is connected with the drive control unit and is used for controlling the positive output line of the drive power supply to be switched on or switched off.
In the shutdown circuit applied to a driving power supply of the present invention, the shutdown circuit further includes: a high temperature failure prevention unit;
the high-temperature failure prevention unit is respectively connected with the isolation unit and the drive control unit and is used for preventing the isolation unit from generating dark current at high temperature.
In the shutdown circuit applied to a driving power supply of the present invention, the shutdown circuit further includes: a power supply unit connected to the drive control unit;
the power supply unit is used for providing a power supply signal to the switch unit through the driving control unit.
In the shutdown circuit applied to a driving power supply of the present invention, the detection judging unit includes: a detection circuit and a judgment circuit;
the input end of the detection circuit is used for receiving an input signal and generating a detection signal based on the input signal;
the judging circuit is connected with the detecting circuit and used for comparing the detecting signal with a reference signal and outputting the comparison signal according to a comparison result.
In the shutdown circuit applied to a driving power supply of the present invention, the shutdown circuit further includes: a return difference unit;
the return difference unit is connected with the judging circuit and used for providing a return difference signal for the judging circuit.
In the shutdown circuit applied to a driving power supply of the present invention, the detection circuit includes: a first resistor and a second resistor;
a first end of the first resistor is used as an input end of the detection circuit to receive the input signal, and a second end of the first resistor is connected with the judgment circuit;
the first end of the second resistor is grounded, and the second end of the second resistor is connected with the second end of the first resistor.
In the shutdown circuit applied to a driving power supply of the present invention, the determination circuit includes: the operational amplifier, the tenth resistor, the eleventh resistor and the fourth resistor;
the negative input end of the operational amplifier is connected with the second end of the first resistor, the positive input end of the operational amplifier is connected with the reference signal through the tenth resistor, the positive input end of the operational amplifier is grounded through the eleventh resistor, the power supply end of the operational amplifier is connected with a high level, the grounding end of the operational amplifier is grounded, the output end of the operational amplifier is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the isolation unit.
In the turn-off circuit applied to a driving power supply of the present invention, the return difference unit includes: a first diode and a third resistor;
the cathode of the first diode is connected with the positive input end of the operational amplifier, the anode of the first diode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the first end of the fourth resistor.
In the shutdown circuit applied to a driving power supply of the present invention, the isolation unit includes: a photoelectric coupler;
the first end of the photoelectric coupler is connected with the output end of the detection and judgment unit, and the second end of the photoelectric coupler is grounded;
and the third end and the fourth end of the photoelectric coupler are respectively connected to the high-temperature failure prevention unit.
In the shutdown circuit applied to a driving power supply of the present invention, the high temperature failure prevention unit includes: a sixth resistor, a seventh resistor and a reference device;
a first end of the sixth resistor is connected with an input end of the driving control unit, a second end of the sixth resistor is connected with a fourth end of the photoelectric coupler, a first end of the seventh resistor is connected with a first end of the reference device, and a second end of the seventh resistor is connected with a positive output line of the driving power supply;
the first end of the reference device is connected with the third end of the photoelectric coupler, the second end of the reference device is connected with the driving control unit, and the third end of the reference device is connected with the positive output line of the driving power supply.
In the shutdown circuit applied to a drive power supply of the present invention, the drive control unit includes: the eighth resistor, the first voltage-regulator tube, the first triode and the second voltage-regulator tube;
a collector of the first triode is used as an input end of the drive control unit and connected with a first end of the sixth resistor, and an emitter of the first triode is used as an output end of the drive control unit and connected with the switch unit;
the first end of the eighth resistor is connected with the collector of the first triode, the second end of the eighth resistor is connected with the cathode of the first voltage-regulator tube and the second end of the reference device, and the anode of the first voltage-regulator tube is connected with the base of the first triode;
the cathode of the second voltage-regulator tube is connected with the base electrode of the first triode, and the anode of the second voltage-regulator tube is connected with the positive output line of the driving power supply.
In the turn-off circuit applied to a driving power supply of the present invention, the power supply unit includes: the transformer, the second diode, the fifth resistor and the first capacitor;
a first end of the transformer is connected with an anode of the second diode, and a second end of the transformer is connected with a second end of the first capacitor and connected to a positive output line of the driving power supply;
the cathode of the second diode is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the first end of the first capacitor and the input end of the driving control unit.
In the turn-off circuit applied to a driving power supply of the present invention, the switching unit includes: a ninth resistor and a second MOS tube;
a first end of the ninth resistor is connected with the grid electrode of the second MOS tube, and a second end of the ninth resistor is connected with the source electrode of the second MOS tube;
the grid electrode of the second MOS tube is connected with the output end of the drive control unit, the drain electrode of the second MOS tube is connected with a positive voltage, and the source electrode of the second MOS tube is connected with the positive output wire of the drive power supply.
The utility model also provides a driving power supply, which comprises the turn-off circuit applied to the driving power supply.
The shutdown circuit applied to the driving power supply and the driving power supply have the following beneficial effects: the method comprises the following steps: the device comprises a detection judgment unit, an isolation unit, a drive control unit and a switch unit; the detection judging unit is used for detecting the input signal, judging and processing the input signal and outputting a comparison signal; the isolation unit is connected with the detection judgment unit and is used for isolating the comparison signal output by the detection judgment unit from the driving signal of the switch unit; the drive control unit is connected with the isolation unit and used for controlling the drive of the switch unit to be switched on or switched off; the switch unit is connected with the drive control unit and is used for controlling the positive output line of the drive power supply to be switched on or switched off. According to the utility model, the turn-off circuit is arranged on the positive output line of the driving power supply, so that the positive output line can be really disconnected, and thus the lamp bead is completely turned off, and the lamp bead is prevented from being slightly bright.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a shutdown circuit applied to a driving power supply according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a shutdown circuit applied to a driving power supply according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the shutdown circuit applied to a driving power supply provided by the present invention can be applied to a non-isolated driving power supply, such as a driving power supply in an industrial lighting application, a UV LED driving power supply, and the like.
Specifically, as shown in fig. 1, the shutdown circuit applied to the driving power supply includes: detection judging unit 10, isolation unit 30, drive control unit 50, and switch unit 60.
The detection and judgment unit 10 is used for detecting an input signal, performing judgment processing based on the input signal, and outputting a comparison signal.
The isolation unit 30 is connected to the detection and judgment unit 10, and is used for isolating the comparison signal output by the detection and judgment unit 10 from the driving signal of the switch unit 60.
The driving control unit 50 is connected to the isolation unit 30, and controls the driving of the switching unit 60 to be turned on or off.
The switching unit 60 is connected to the driving control unit 50, and is used to control the positive output line of the driving power supply to be turned on or off.
Optionally, in the embodiment of the present invention, the switch unit 60 controls the positive output line of the driving power supply to be turned on or off, so that a loop is prevented from being formed with the Y capacitor when the positive output line of the driving power supply is turned off, and complete turning off is achieved.
Further, in some embodiments, as shown in fig. 1, the shutdown circuit applied to the driving power supply further includes: a high temperature fail-safe unit 40.
The high temperature failure prevention unit 40 is connected to the isolation unit 30 and the driving control unit 50, respectively, for preventing the isolation unit 30 from generating a dark current at a high temperature. It is understood that the isolation unit 30 generates a dark current at a high temperature, which may cause a failure in the driving control of the driving control unit 50. Therefore, the present invention can prevent the driving control unit 50 from being failed due to dark current generated at a high temperature of the isolation unit 30 by providing the high temperature failure prevention unit 40.
Further, in some embodiments, as shown in fig. 1, the shutdown circuit applied to the driving power supply further includes: and a power supply unit 70 connected to the drive control unit 50.
The power supply unit 70 is used to supply a power supply signal to the switching unit 60 through the driving control unit 50.
Optionally, in the embodiment of the present invention, as shown in fig. 1, the detection and judgment unit 10 includes: a detection circuit and a judgment circuit.
The input end of the detection circuit is used for receiving an input signal and generating a detection signal based on the input signal.
Optionally, in this embodiment of the present invention, the input signal may be a current reference signal or an external control direct current signal.
The judging circuit is connected with the detecting circuit and used for comparing the detecting signal with the reference signal and outputting a comparison signal according to a comparison result.
Optionally, in this embodiment of the present invention, the comparison signal may be a high-level signal or a low-level signal.
Specifically, the detection signal output from the detection circuit is compared with a reference signal to determine whether the detection signal is lower or higher than the reference signal, thereby outputting a high level or a low level.
Further, in some embodiments, as shown in fig. 1, the shutdown circuit applied to the driving power supply further includes: and a return difference unit 20.
The back difference unit 20 is connected to the judging circuit for providing a back difference signal to the judging circuit.
Optionally, the return difference signal provided by the return difference unit 20 is used for dimming turn-off or dimming turn-on, so as to avoid a situation that a lamp flashes at a critical point of turn-off or turn-on.
Referring to fig. 2, a circuit diagram of an alternative embodiment of the shutdown circuit applied to the driving power supply according to the present invention is shown.
Specifically, as shown in fig. 2, in this embodiment, the detection circuit includes: a first resistor R1 and a second resistor R2.
The first end of the first resistor R1 is used as the input end of the detection circuit to receive the input signal (IREF), and the second end of the first resistor R1 is connected with the judgment circuit. The first end of the second resistor R2 is grounded, and the second end of the second resistor R2 is connected with the second end of the first resistor R1.
As shown in fig. 2, in this embodiment, the judgment circuit includes: an operational amplifier U1, a tenth resistor R10, an eleventh resistor, and a fourth resistor R4.
The negative input end of the operational amplifier U1 is connected to the second end of the first resistor R1, the positive input end of the operational amplifier U1 is connected to the reference signal (VREF) through the tenth resistor R10, the positive input end of the operational amplifier U1 is also grounded through the eleventh resistor, the power supply end of the operational amplifier U1 is connected to the high level (SVCC), the ground end of the operational amplifier U1 is grounded, the output end of the operational amplifier U1 is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is connected to the isolation unit 30 (as shown, the second end of the fourth resistor R4 is connected to the first end of the photocoupler OT 1).
As shown in fig. 2, in this embodiment, the return difference unit 20 includes: a first diode D1 and a third resistor R3.
The cathode of the first diode D1 is connected to the positive input terminal of the operational amplifier U1, the anode of the first diode D1 is connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is connected to the first terminal of the fourth resistor R4.
As shown in fig. 2, in this embodiment, the isolation unit 30 includes: and a photocoupler OT 1.
The first end of the photoelectric coupler OT1 is connected with the output end of the detection and judgment unit 10, and the second end of the photoelectric coupler OT1 is grounded; the third end and the fourth end of the photoelectric coupler OT1 are respectively connected to the high temperature failure prevention unit 40 (i.e., as shown in fig. 2, the third end of the photoelectric coupler OT1 is connected to the second end of the sixth resistor R6, and the fourth end of the photoelectric coupler OT1 is connected to the first end of the reference U2).
As shown in fig. 2, in this embodiment, the high temperature failure prevention unit 40 includes: a sixth resistor R6, a seventh resistor R7 and a reference U2.
A first end of a sixth resistor R6 is connected to an input end of the driving control unit 50, a second end of the sixth resistor R6 is connected to a fourth end of a photocoupler OT1, a first end of a seventh resistor R7 is connected to a first end of a reference U2, and a second end of a seventh resistor R7 is connected to a positive output line (VO +) of the driving power supply; the first end of the reference U2 is connected with the third end of the photoelectric coupler OT1, the second end of the reference U2 is connected with the driving control unit 50, and the third end of the reference U2 is connected with the positive output line of the driving power supply.
As shown in fig. 2, in this embodiment, the drive control unit 50 includes: the voltage regulator comprises an eighth resistor R8, a first voltage regulator ZD1, a first triode Q1 and a second voltage regulator ZD 2.
A collector of the first triode Q1 is connected to a first end of the sixth resistor R6 as an input end of the driving control unit 50, and an emitter of the first triode Q1 is connected to the switching unit 60 as an output end of the driving control unit 50; a first end of the eighth resistor R8 is connected with a collector of the first triode Q1, a second end of the eighth resistor R8 is connected with a cathode of the first voltage regulator ZD1 and a second end of the reference device U2, and an anode of the first voltage regulator ZD1 is connected with a base of the first triode Q1; the cathode of the second voltage-regulator tube ZD2 is connected with the base of the first triode Q1, and the anode of the second voltage-regulator tube ZD2 is connected with the positive output line of the driving power supply.
As shown in fig. 2, in this embodiment, the power supply unit 70 includes: the circuit comprises a transformer, a second diode D2, a fifth resistor R5 and a first capacitor C1.
A first end of the transformer is connected with the anode of the second diode D2, and a second end of the transformer is connected with a second end of the first capacitor C1 and connected to the positive output line of the driving power supply; the cathode of the second diode D2 is connected to the first terminal of the fifth resistor R5, and the second terminal of the fifth resistor R5 is connected to the first terminal of the first capacitor C1 and to the input terminal of the driving control unit 50.
As shown in fig. 2, in this embodiment, the switching unit 60 includes: a ninth resistor R9 and a second MOS transistor Q2.
A first end of the ninth resistor R9 is connected to the gate of the second MOS transistor Q2, and a second end of the ninth resistor R9 is connected to the source of the second MOS transistor Q2; the gate of the second MOS transistor Q2 is connected to the output terminal of the driving control unit 50, the drain of the second MOS transistor Q2 is connected to a positive voltage (V +), and the source of the second MOS transistor Q2 is connected to a positive output line of the driving power supply.
Specifically, as shown in fig. 2, in this embodiment, the operation principle of the shutdown circuit applied to the driving power supply is as follows:
A. when the driving power supply is dimmed, the IREF signal gradually decreases along with the change of the driving power supply, the IREF signal gradually decreases, the first resistor R1 and the second resistor R2 in the detection circuit detect the IREF signal through voltage division, and the voltage VR2 on the second resistor R2 is compared with the voltage VR11 on the eleventh resistor. With the reduction of the IREF signal, when VR2 is less than VR11, the operational amplifier U1 outputs high level, the optocoupler works, and meanwhile, the VR11 is improved through the first diode D1 and the third resistor R3 of the return difference circuit, so that the VR2 is less than the VR11, and the lamp flash caused by repeated actions of the operational amplifier U1 is avoided. Similarly, the IREF signal is gradually increased from 0, when VR2 is greater than VR11, the operational amplifier U1 outputs a low level, the photocoupler OT1 does not work, and meanwhile, the VR2 is larger than VR11 by making the higher signal of VR11 disappear through the first diode D1 and the third resistor R3, so that the lamp flash caused by the repeated action of the operational amplifier U1 is avoided.
B. The power supply unit 70 is an independent winding that supplies voltage for floating driving of the switching unit 60. The photocoupler OT1 is an isolation device, and can effectively control the floating drive of the second MOS transistor Q2 in the switching unit 60 by a current reference signal or an external common ground DC signal. The photoelectric coupler OT1 can generate dark current at high temperature, if the photoelectric coupler OT1 directly controls the second MOS transistor Q2 or the first triode Q1 in the drive control unit 50, when the photoelectric coupler OT1 is used at high temperature, there is no influence if the photoelectric coupler OT1 is in an operating state, but if the photoelectric coupler OT1 is in an inoperative state, the dark current of the photoelectric coupler can affect the action of the second MOS transistor Q2 or the first triode Q1, and even the second MOS transistor Q2 can be damaged due to insufficient drive capability. The high temperature failure prevention unit 40 is applied to the reference U2 as a voltage reference source, and assuming that the temperature of the photocoupler OT1 is 110 ℃ (for example, the EL817 operating temperature is-55 ℃ to 110 ℃, and it is assumed here that the photocoupler operates at the highest operating temperature), when the dark current is about 2uA, the seventh resistor R7 selects appropriate parameters to enable the voltage VR7 thereof to be less than Vref _ U2, and when 2 pins to 3 pins of the reference U2 are in an open circuit state, so that the influence of the dark current of the photocoupler OT1 on the control circuit at high temperature is avoided.
C. When the photoelectric coupler OT1 works, pins 4 to 3 of the photoelectric coupler OT1 are conducted, the sixth resistor R6, the seventh resistor R7 and the photoelectric coupler OT1 divide voltage, and the sixth resistor R6 selects proper parameters, so that the divided voltage VR7 on the seventh resistor R7 is larger than Vref _ U2, the voltage on the seventh resistor R7 is clamped at Vref _ U2, pins 2 to 3 on the reference U2 are conducted, and VKA _ U2 is approximately equal to Vref _ U2; when the photoelectric coupler OT1 does not work, the pin from OT14 of the photoelectric coupler OT is not communicated with the pin 3, VR7 is approximately equal to 0 (considering the influence of high temperature) < Vref _ U2, and the pin from 2 to 3 of the reference U2 is in an open circuit state. By selecting proper parameters of the first voltage regulator ZD1, whether the first voltage regulator ZD1 breaks down can be used to control the switching on and off of the first transistor Q1. The eighth resistor R8 is a current-limiting resistor, the output of the first triode Q1 provides drive for the second MOS transistor Q2, and the second regulator ZD2 clamps the drive voltage, so that the drive voltage is not too high and the second MOS transistor Q2 is not damaged.
Examples are: VC1 ═ 20K Ω, R7 ═ 18K Ω, U2 is AZ431 (benchmark 2.5V), R8 ═ 7.5K Ω, ZD1 is 5.1V, ZD2 is 12V, when the optocoupler works, VR7 ═ 20 × 18 ÷ (18+30) ═ 7.5V > 2.5V, so VR7 is clamped at 2.5V, at this time VKA _ U2 ≈ 2.5V < 5.1V, the first zener 1 is not broken down, the first triode Q1 is not conductive, and the second MOS transistor Q2 is driven to 0, that is, the second MOS transistor Q2 is in the off state; when the photoelectric coupler OT1 does not work, VR7 is approximately equal to 0 and less than 2.5V, pins 2 to 3 of a reference device U2 are in an open circuit state, VKA _ U2 is clamped by a first voltage-regulator tube ZD1 and a second voltage-regulator tube ZD2, VC1 is 20V and more than 5.1V, so that the first voltage-regulator tube ZD1 is broken down and conducted, the first triode Q1 is conducted, a high level of about 12V is output, and the second MOS tube Q2 is conducted.
D. Finally, the second MOS transistor Q2 in the switching unit 60 is turned off when the IREF signal in the detection circuit is lower than a certain value, and the second MOS transistor Q2 in the switching unit 60 is turned on when the IREF signal in the detection circuit is higher than a certain value.
The utility model also provides a driving power supply which comprises the turn-off circuit applied to the driving power supply provided by the embodiment of the utility model.
In the light-adjustable non-isolated power supply, after the ground wire is connected, because the output positive line and the Y capacitor, and the junction capacitor between the lamp bead and the lamp plate form a loop, the effect of complete turn-off can not be realized only by turning off the IC, and the utility model can ensure that the output positive line is really disconnected by adding the turn-off circuit on the positive output line of the driving power supply, thereby completely turning off the output positive line. When the circuit is applied to the UV industry, the trouble of an external relay can be saved, and because the circuit is integrated in a power supply, the circuit is more convenient for customers to use, and the cost can be reduced.
Because the switching tube is directly connected in series with the positive output line, the requirement of quick response of on-off can be met in the UV industry.
The above embodiments are only for illustrating the technical idea and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (14)
1. A shutdown circuit for a driver power supply, comprising: the device comprises a detection judgment unit, an isolation unit, a drive control unit and a switch unit;
the detection judgment unit is used for detecting an input signal, performing judgment processing based on the input signal and outputting a comparison signal;
the isolation unit is connected with the detection judgment unit and is used for isolating the comparison signal output by the detection judgment unit from the driving signal of the switch unit;
the drive control unit is connected with the isolation unit and used for controlling the drive of the switch unit to be switched on or switched off;
the switch unit is connected with the drive control unit and used for controlling the positive output line of the drive power supply to be switched on or switched off.
2. A shutdown circuit applied to a driving power supply according to claim 1, further comprising: a high temperature failure prevention unit;
the high-temperature failure prevention unit is respectively connected with the isolation unit and the drive control unit and is used for preventing the isolation unit from generating dark current at high temperature.
3. A shutdown circuit applied to a driving power supply according to claim 1, further comprising: a power supply unit connected to the drive control unit;
the power supply unit is used for providing a power supply signal to the switch unit through the driving control unit.
4. A shutdown circuit applied to a drive power supply according to claim 1, wherein the detection judgment unit includes: a detection circuit and a judgment circuit;
the input end of the detection circuit is used for receiving an input signal and generating a detection signal based on the input signal;
the judging circuit is connected with the detecting circuit and used for comparing the detecting signal with a reference signal and outputting the comparison signal according to a comparison result.
5. A shutdown circuit applied to a drive power supply according to claim 4, further comprising: a return difference unit;
the return difference unit is connected with the judging circuit and used for providing a return difference signal for the judging circuit.
6. A shutdown circuit applied to a drive power supply as set forth in claim 5, wherein said detection circuit includes: a first resistor and a second resistor;
a first end of the first resistor is used as an input end of the detection circuit to receive the input signal, and a second end of the first resistor is connected with the judgment circuit;
the first end of the second resistor is grounded, and the second end of the second resistor is connected with the second end of the first resistor.
7. A shutdown circuit applied to a drive power supply according to claim 6, wherein the judgment circuit includes: the operational amplifier, the tenth resistor, the eleventh resistor and the fourth resistor;
the negative input end of the operational amplifier is connected with the second end of the first resistor, the positive input end of the operational amplifier is connected with the reference signal through the tenth resistor, the positive input end of the operational amplifier is grounded through the eleventh resistor, the power supply end of the operational amplifier is connected with a high level, the grounding end of the operational amplifier is grounded, the output end of the operational amplifier is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the isolation unit.
8. A turn-off circuit applied to a driving power supply according to claim 7, wherein the return difference unit comprises: a first diode and a third resistor;
the cathode of the first diode is connected with the positive input end of the operational amplifier, the anode of the first diode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the first end of the fourth resistor.
9. A shutdown circuit applied to a drive power supply according to claim 2, wherein the isolation unit includes: a photoelectric coupler;
the first end of the photoelectric coupler is connected with the output end of the detection and judgment unit, and the second end of the photoelectric coupler is grounded;
and the third end and the fourth end of the photoelectric coupler are respectively connected to the high-temperature failure prevention unit.
10. A shutdown circuit applied to a drive power supply according to claim 9, wherein the high temperature failure prevention unit includes: a sixth resistor, a seventh resistor and a reference device;
a first end of the sixth resistor is connected with an input end of the driving control unit, a second end of the sixth resistor is connected with a fourth end of the photoelectric coupler, a first end of the seventh resistor is connected with a first end of the reference device, and a second end of the seventh resistor is connected with a positive output line of the driving power supply;
the first end of the reference device is connected with the third end of the photoelectric coupler, the second end of the reference device is connected with the driving control unit, and the third end of the reference device is connected with the positive output line of the driving power supply.
11. A shutdown circuit applied to a drive power supply according to claim 10, wherein the drive control unit includes: the eighth resistor, the first voltage-regulator tube, the first triode and the second voltage-regulator tube;
a collector of the first triode is used as an input end of the drive control unit and connected with a first end of the sixth resistor, and an emitter of the first triode is used as an output end of the drive control unit and connected with the switch unit;
the first end of the eighth resistor is connected with the collector of the first triode, the second end of the eighth resistor is connected with the cathode of the first voltage-regulator tube and the second end of the reference device, and the anode of the first voltage-regulator tube is connected with the base of the first triode;
the cathode of the second voltage-regulator tube is connected with the base electrode of the first triode, and the anode of the second voltage-regulator tube is connected with the positive output line of the driving power supply.
12. A shutdown circuit for a drive power supply as claimed in claim 3, wherein said power supply unit includes: the transformer, the second diode, the fifth resistor and the first capacitor;
a first end of the transformer is connected with an anode of the second diode, and a second end of the transformer is connected with a second end of the first capacitor and connected to a positive output line of the driving power supply;
the cathode of the second diode is connected with the first end of the fifth resistor, and the second end of the fifth resistor is connected with the first end of the first capacitor and the input end of the driving control unit.
13. A turn-off circuit applied to a driving power supply according to any one of claims 1 to 11, wherein the switching unit includes: a ninth resistor and a second MOS tube;
a first end of the ninth resistor is connected with the grid electrode of the second MOS tube, and a second end of the ninth resistor is connected with the source electrode of the second MOS tube;
the grid electrode of the second MOS tube is connected with the output end of the drive control unit, the drain electrode of the second MOS tube is connected with a positive voltage, and the source electrode of the second MOS tube is connected with the positive output line of the drive power supply.
14. A driving power supply comprising the shutdown circuit of any one of claims 1 to 13 applied to a driving power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220028823.5U CN217037155U (en) | 2022-01-06 | 2022-01-06 | Shutdown circuit applied to driving power supply and driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220028823.5U CN217037155U (en) | 2022-01-06 | 2022-01-06 | Shutdown circuit applied to driving power supply and driving power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217037155U true CN217037155U (en) | 2022-07-22 |
Family
ID=82445665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220028823.5U Active CN217037155U (en) | 2022-01-06 | 2022-01-06 | Shutdown circuit applied to driving power supply and driving power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217037155U (en) |
-
2022
- 2022-01-06 CN CN202220028823.5U patent/CN217037155U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103384432A (en) | Led driver ic, driving method thereof, and led emitting device using the led driver ic and the driving method | |
| CN101527990B (en) | Light emitting diode driving circuit | |
| JP2007258671A (en) | Drive circuit of light-emitting diode | |
| JP2006325396A (en) | Dc-dc converter having overcurrent/overvoltage protection function and led drive circuit including same | |
| US10505457B2 (en) | Ground leakage power supply for dimming applications | |
| US11523481B2 (en) | Combinational circuit and control circuit | |
| CN104883799B (en) | Control method, control circuit, system and LED lamp for LED driving | |
| CN202257349U (en) | Current generating circuit | |
| US20140292202A1 (en) | LED Backlight Driving Circuit and Backlight Module | |
| CN110366291A (en) | With more specification light source load Auto-matchings for electric drive, lamps and lanterns and driving method | |
| CN217037155U (en) | Shutdown circuit applied to driving power supply and driving power supply | |
| EP3592117B1 (en) | Protective circuit and led driving circuit | |
| CN108594082B (en) | Power-down signal transmission circuit and method for commercial power | |
| CN216852444U (en) | Power control circuit, driving power supply and lamp | |
| JP7066060B2 (en) | Drive circuit and related lamps | |
| CN101399008B (en) | Converter circuit with restart function and relevant display apparatus | |
| CN218003674U (en) | Flash-off state detection circuit and electronic device | |
| CN116916489A (en) | LED light intelligent controller | |
| EP3397026A1 (en) | Miswiring protection circuit for use with a dc power supply and an led lamp | |
| CN205793505U (en) | A kind of LED backlight circuit and liquid crystal TV set | |
| CN110351924B (en) | LED drive circuit with low standby power consumption | |
| CN209767879U (en) | PCB compatible with multi-mode constant-current dimming circuit | |
| CN111988898A (en) | Independent DALI conversion module of adjusting luminance | |
| CN108934101B (en) | LED lamp | |
| CN212113186U (en) | Backlight driving circuit and backlight driving device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |