CN216852444U - Power control circuit, driving power supply and lamp - Google Patents
Power control circuit, driving power supply and lamp Download PDFInfo
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- CN216852444U CN216852444U CN202123001044.0U CN202123001044U CN216852444U CN 216852444 U CN216852444 U CN 216852444U CN 202123001044 U CN202123001044 U CN 202123001044U CN 216852444 U CN216852444 U CN 216852444U
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Abstract
The utility model relates to a power supply control circuit, a driving power supply and a lamp, comprising: the device comprises a control level generating unit, an isolating switch, a driving unit and a switching unit; the control level generating unit is used for generating a control level; the isolating switch is connected with the control level generating unit and used for receiving the control level to be switched on or switched off; the driving unit is connected with the isolating switch and used for outputting a corresponding driving level according to the connection or disconnection of the isolating switch; the switch unit is connected with the drive unit, the negative electrode output end of the power supply and the ground and used for receiving the drive level to be switched on or switched off. The utility model is easy to integrate and the control process is simple and quick.
Description
Technical Field
The utility model relates to the technical field of power supplies, in particular to a power supply control circuit, a driving power supply and a lamp.
Background
In industrial 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, various dimmable power supplies according to the environment and user requirements are also developing vigorously, and the dimming power supplies are divided into two types, namely dimming-off-free power supplies and dimming-off power supplies. 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. 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 the junction capacitor between the lamp bead and the lamp plate form a loop, so that the lamp bead is slightly bright, and the effect of complete turn-off cannot be realized.
The market of UV LEDs has been growing at a very high speed in recent years, and products are widely applied to the fields of printing, furniture coating, 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 a power output end by an external relay. The method of using the external relay to control the output to be turned off not only has high cost, but also greatly increases the volume.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a power supply control circuit, a driving power supply and a lamp.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a power supply control circuit is constructed comprising: the device comprises a control level generating unit, an isolating switch, a driving unit and a switching unit;
the control level generating unit is used for generating a control level;
the isolating switch is connected with the control level generating unit and used for receiving the control level to be switched on or switched off;
the driving unit is connected with the isolating switch and used for outputting a corresponding driving level according to the connection or disconnection of the isolating switch;
The switch unit is connected with the drive unit, the negative electrode output end of the power supply and the ground and is used for receiving the drive level to be switched on or switched off.
Preferably, in the power control circuit of the present invention, the driving unit includes a reference voltage chip U3, a zener diode ZD1, a zener diode ZD2, a first switching tube, a resistor R35, a resistor R34, and a resistor R2;
the first end of the reference voltage chip U3 is connected with the first end of the resistor R2 and the cathode of the zener diode ZD1, the third end of the reference voltage chip U3 is connected with the fourth end of the isolating switch and the first end of the resistor R35, the second end of the resistor R2, the first end of the resistor R34 and the first end of the first switch tube are respectively connected with a first power supply voltage, the second end of the first switch tube is connected with the switch unit, the third end of the first switch tube is connected with the anode of the zener diode ZD1 and the cathode of the zener diode ZD2, the anode of the zener diode ZD2, the second end of the reference voltage chip U3 and the second end of the resistor R35 are grounded, and the second end of the resistor R34 is connected with the third end of the isolating switch.
Preferably, in the power supply control circuit of the utility model, the disconnecting switch comprises an optical coupler OT3 and a resistor R27;
The first end of opto-coupler OT3 is connected the first end of resistance R27, the second end of resistance R27 is used for connecting second mains voltage, the second end of opto-coupler OT3 is connected control level generation unit, the third end of opto-coupler OT3 is connected the first end of resistance R34, the fourth end of opto-coupler OT3 is connected the first end of resistance R35 with the third end of reference voltage chip U3.
Preferably, in the power control circuit of the present invention, the switch unit includes a second switch tube and a resistor R1;
the first end of the second switch tube is grounded, the second end of the second switch tube is connected with the negative output end of the power supply and the first end of the resistor R1, and the third end of the second switch tube is connected with the second end of the first switch tube and the second end of the resistor R1.
Preferably, in the power control circuit of the present invention, the control level generating unit includes a dimming chip U1, a comparing circuit, and a first switching circuit;
the fifth pin of chip U1 of adjusting luminance is used for connecting the positive input end of signal of adjusting luminance, the third pin of chip U1 of adjusting luminance is connected comparison circuit's first input end, the fourth pin of chip U1 of adjusting luminance is connected comparison circuit's second input, comparison circuit's output is connected first switch circuit's third end, first switch circuit's first end is connected adjust luminance signal's negative input end, first switch circuit's second end is connected the second end of opto-coupler OT 3.
Preferably, in the power control circuit of the present invention, the first switch circuit includes a third switch tube, a resistor R29 and a resistor R26; a first end of the third switching tube is connected with a first end of the resistor R29 and a negative input end of the dimming signal, a second end of the third switching tube is connected with a second end of the opto-coupler OT3, a third end of the third switching tube is connected with a second end of the resistor R29 and a first end of the resistor R26, and a second end of the resistor R26 is connected with an output end of the comparison circuit; and/or
The comparison circuit comprises an operational amplifier U2, a resistor R20, a resistor R19, a resistor R18 and a resistor R24; the inverting input end of the operational amplifier U2 is connected to the fourth pin of the dimming chip U1 through the resistor R20, the non-inverting input end of the operational amplifier U2 is connected to the first end of the resistor R19, the first end of the resistor R18 and the first end of the resistor R24, the second end of the resistor R19 is connected to the third pin of the dimming chip U1, the second end of the resistor R18 is connected to the negative input end of the dimming signal, and the second end of the resistor R24 is connected to the output end of the operational amplifier U2 and the third end of the first switch circuit.
Preferably, in the power supply control circuit according to the present invention, the control level generating unit includes a second switch circuit, a third switch circuit, and a diode D7;
the third end of the second switch circuit is used for connecting a positive input end of an external control signal, the first end of the second switch circuit is connected with the anode of the diode D7, the cathode of the diode D7 is used for connecting a negative input end of the external control signal, the second end of the second switch circuit is connected with the third end of the third switch circuit, the first end of the third switch circuit is connected with the anode of the diode D7, and the second end of the third switch circuit is connected with the second end of the optocoupler OT 3.
Preferably, in the power control circuit of the present invention, the second switch circuit includes a fourth switch tube, a resistor R33 and a resistor R28; a first end of the fourth switching tube is connected with a first end of the resistor R33 and an anode of the diode D7, a third end of the fourth switching tube is connected with a second end of the resistor R33 and a first end of the resistor R28, a second end of the resistor R28 is used for connecting a positive input end of the external control signal, and a second end of the fourth switching tube is connected with a third end of the third switching circuit; and/or
The third switching circuit comprises a fifth switching tube, a resistor R39 and a resistor R30; the first end of the fifth switching tube is connected with the first end of the resistor R39 and the anode of the diode D7, the second end of the fifth switching tube is connected with the second end of the optical coupler OT3, the third end of the fifth switching tube is connected with the second end of the resistor R39, the second end of the second switching circuit and the first end of the resistor R30, and the second end of the resistor R30 is used for being connected with the second power supply voltage.
The present invention also provides a driving power supply including the power supply control circuit as described in any one of the above.
The utility model also provides a lamp comprising the driving power supply.
The power supply control circuit, the driving power supply and the lamp have the following beneficial effects: easy integration and simple and quick control process.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a power control circuit according to the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of a power control circuit according to the utility model.
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.
As shown in fig. 1, in a first embodiment of a power control circuit of the present invention, the power control circuit includes: a control level generating unit 110, an isolating switch 120, a driving unit 130, and a switching unit 140; the control level generating unit 110 is used for generating a control level; the isolating switch 120 is connected to the control level generating unit 110, and is configured to receive a control level to turn on or off; the driving unit 130 is connected to the isolating switch 120, and is configured to output a corresponding driving level according to the on or off of the isolating switch 120; the switching unit 140 is connected to the driving unit 130 and the negative output terminal of the power supply and ground, and is configured to receive a driving level to turn on or off. Specifically, the control level is generated by the control level generating unit 110, and the control level controls the isolation switch 120 to be turned on or off. When the isolating switch 120 is turned off, the driving unit 130 is driven to generate a driving level to drive the switching unit 140 to be turned on, at this time, the negative electrode of the power supply is turned on with the ground, the power supply output can form a loop in the post-stage working circuit, and the post-stage circuit is normally powered to work. When the isolating switch 120 is turned on, the driving unit 130 is driven to generate a driving level to drive the switching unit 140 to turn off, at this time, the negative electrode of the power supply is disconnected from the ground, the power supply output cannot form a loop in the subsequent circuit, and the subsequent circuit is in a power-off state. And finally, realizing the output control process of the power supply.
Optionally, as shown in fig. 2, the driving unit 130 includes a reference voltage chip U3, a voltage regulator ZD1, a voltage regulator ZD2, a first switch tube, a resistor R35, a resistor R34, and a resistor R2; the first end of a reference voltage chip U3 is connected with the first end of a resistor R2 and the cathode of a voltage regulator tube ZD1, the third end of the reference voltage chip U3 is connected with the fourth end of an isolating switch 120 and the first end of a resistor R35, the second end of a resistor R2, the first end of the resistor R34 and the first end of a first switch tube are respectively connected with a first power supply voltage, the second end of the first switch tube is connected with a switch unit 140, the third end of the first switch tube is connected with the anode of a voltage regulator tube ZD1 and the cathode of a voltage regulator tube ZD2, the anode of the voltage regulator tube ZD2, the second end of the reference voltage chip U3 and the second end of the resistor R35 are grounded, and the second end of a resistor R34 is connected with the third end of the isolating switch 120. Specifically, in the driving unit 130, a first terminal of the reference voltage chip U3 is connected to a first power voltage through a resistor R2, a second terminal of the reference voltage chip U3 is grounded, and a third pin of the reference voltage chip U3 is controlled to be powered on or powered off through the isolating switch 120. When the isolating switch 120 is turned on, the resistor R34 and the resistor R35 form a voltage dividing circuit through the turned-on isolating switch 120, so that the reference voltage chip U3 is powered on, at this time, a first end of the reference voltage chip U3 generates a reference voltage, parameters of the resistor R34 and the resistor R35 can be reasonably set, the divided voltage on the resistor R35 can drive the reference voltage chip U3 to normally work at the first end thereof to generate the reference voltage, the voltage regulator ZD1 is not reversely broken down when the reference voltage is generated, and at this time, the first switch tube is not turned on. When the isolating switch 120 is turned off, the resistor R34 and the resistor R35 do not generate voltage division, at this time, the third end of the reference voltage chip U3 has no voltage, the first power voltage passes through the resistor R2 and then generates a high voltage at the cathode end of the voltage regulator ZD1, the high voltage makes the voltage regulator ZD1 be reverse breakdown, the reverse breakdown voltage drives the first switch tube to be on, at this time, the driving unit 130 outputs a high level, and the high level drives the switching unit 140 to be on. In an embodiment, the first switch tube may be a transistor Q1, an emitter of the transistor Q1 is connected to the switch unit 140, a collector of the transistor Q1 is connected to the first power voltage, and a base of the transistor Q1 is connected to an anode of the voltage regulator ZD 1. In various embodiments, the regulator ZD1 needs to select corresponding parameters to control the on and off of the transistor Q1 by using whether the regulator ZD1 breaks down. The resistor R2 is a current-limiting resistor, the output of the triode Q1 provides drive for the switch unit 140, and the voltage regulator ZD2 clamps the drive voltage, so that the drive voltage is not too high to damage the switch unit 140. In a specific embodiment, the first power voltage VCC1 is 20V, the resistance of the resistor R34 is 30K Ω, the resistance of the resistor R35 is 18K Ω, the chip U3 is AZ431 based on the standard of 2.5V, the resistance of the resistor R2 is 7.5K Ω, the voltage regulator ZD1 is a 5.1V voltage regulator, and the voltage regulator ZD2 is a 12V voltage regulator. When the isolating switch 120 is turned on, the voltage division of the resistor R35 is VR35 ═ 20 × 18 ÷ (18+30) ═ 7.5V > 2.5V, so the voltage division VR35 of the resistor R35 is clamped at 2.5V. At this time, the reference voltage VKA _ U3 of the chip U3 is approximately equal to 2.5V < 5.1V, the voltage regulator tube ZD1 is not broken, the triode Q1 is not conducted, and the switch unit 140 is in an off state. When the isolating switch 120 does not work, VR35 is approximately equal to 0 and is less than 2.5V, pins 2 to 3 of the chip U3 are in an open circuit state, VKA _ U3 is clamped by a voltage regulator tube ZD1 and a voltage regulator tube ZD2, the voltage regulator tube ZD1 is broken down and conducted because VCC1 is 20V and is greater than 5.1V, the triode Q1 is conducted to output a high level of about 12V, and the switching unit 140 is driven to conduct.
Optionally, the isolating switch 120 includes an optical coupler OT3 and a resistor R27; the first end of the optocoupler OT3 is connected with the first end of the resistor R27, the second end of the resistor R27 is used for being connected with a second power supply voltage, the second end of the optocoupler OT3 is connected with the control level generation unit 110, the third end of the optocoupler OT3 is connected with the first end of the resistor R34, and the fourth end of the optocoupler OT3 is connected with the first end of the resistor R35 and the third end of the reference voltage chip U3. Specifically, the isolating switch 120 is composed of an optical coupler OT3 and a peripheral circuit thereof. A first terminal of the optical coupler OT3 is used for inputting a second power voltage, and a second terminal of the optical coupler OT3 is connected to the control level generating unit 110. When the control level generated by the control level generating unit 110 is a low level, the first end and the second end of the optocoupler OT3 are connected, the third end and the fourth end of the driving optocoupler OT3 are connected, and at the moment, the third end and the fourth end of the optocoupler OT3 are connected or disconnected to realize power-on or power-off of the third end of the reference voltage chip U3.
Optionally, the switching unit 140 includes a second switching tube and a resistor R1; the first end of the second switch tube is grounded, the second end of the second switch tube is connected with the negative output end of the power supply and the first end of the resistor R1, and the third end of the second switch tube is connected with the second end of the first switch tube and the second end of the resistor R1. Specifically, in the switch unit 140, the output of the first switch tube drives the second switch tube to be turned on or off, so as to connect or disconnect the negative output end of the power supply with the ground. The second switching tube may be a MOS tube Q2, a gate of the MOS tube Q2 is connected to an emitter of the transistor Q1, a drain of the MOS tube Q2 is grounded, and a source of the MOS tube Q2 is connected to a negative output terminal of the power supply.
Optionally, the control level generating unit 110 includes a first control level generating unit 111, and the first control level generating unit 111 includes a dimming chip U1, a comparing circuit, and a first switch circuit; the fifth pin of the dimming chip U1 is used for connecting the positive input end of the dimming signal, the third pin of the dimming chip U1 is connected with the first input end of the comparison circuit, the fourth pin of the dimming chip U1 is connected with the second input end of the comparison circuit, the output end of the comparison circuit is connected with the third end of the first switch circuit, the first end of the first switch circuit is connected with the negative input end of the dimming signal, and the second end of the first switch circuit is connected with the second end of the optical coupler OT 3. Specifically, the control level may be generated by the dimming chip U1 and its peripheral circuits. When the dimming signal is input to the fifth pin of the dimming chip U1, the output voltage of the fourth pin of the dimming chip U1 changes with the change of the dimming signal. When the level of the dimming signal is gradually decreased, the output voltage of the fourth pin of the dimming chip U1 is gradually decreased, the changed voltage is input to the comparison unit, and meanwhile, the comparison unit generates a reference voltage according to the output voltage of the third pin of the dimming chip U1, and the comparison unit compares the changed voltage with the reference voltage. When the variation voltage is reduced to be less than the reference voltage, the comparison unit outputs a high level, the high level drives the first switch circuit to be conducted, when the first switch circuit is conducted, the level of the second end of the optical coupler OT3 is pulled low, and the optical coupler OT3 is conducted. Similarly, when the variation voltage is increased to be larger than the reference voltage, the comparison unit outputs a low level, the low level drives the first switch circuit to be switched off, the level of the second end of the OT3 is raised when the first switch circuit is switched off, and the OT3 does not work.
Optionally, the first switch circuit includes a third switch tube, a resistor R29 and a resistor R26; the first end of a third switching tube is connected with the first end of the resistor R29 and the negative input end of the dimming signal, the second end of the third switching tube is connected with the second end of the optocoupler OT3, the third end of the third switching tube is connected with the second end of the resistor R29 and the first end of the resistor R26, and the second end of the resistor R26 is connected with the output end of the comparison circuit; specifically, the first switch circuit may be composed of a third switch tube and a peripheral circuit thereof, the third switch tube may be a MOS tube Q5, wherein a source of the MOS tube Q5 is connected to the negative input terminal of the dimming signal, a gate of the MOS tube Q5 is connected to the output terminal of the comparing unit through a resistor R26, and a drain of the MOS tube Q5 is connected to the second terminal of the opto-coupler OT 3.
Optionally, the comparison circuit includes an operational amplifier U2, a resistor R20, a resistor R19, a resistor R18, and a resistor R24; the inverting input end of the operational amplifier U2 is connected with the fourth pin of the dimming chip U1 through a resistor R20, the non-inverting input end of the operational amplifier U2 is connected with the first end of a resistor R19, the first end of a resistor R18 and the first end of a resistor R24, the second end of a resistor R19 is connected with the third pin of the dimming chip U1, the second end of the resistor R18 is connected with the negative input end of a dimming signal, and the second end of the resistor R24 is connected with the output end of the operational amplifier U2 and the third end of the first switching circuit; specifically, the comparison unit may be composed of an operational amplifier U2 and its peripheral circuits. The operational amplifier U2 outputs a high level or a low level according to the input of its inverting input terminal and inverting input terminal. The pin 3 of the dimming chip U1 outputs a 5V reference voltage, which is divided by the resistor R18 and the resistor R19 to generate the reference voltage of the operational amplifier U2, i.e., the reference voltage of the comparison unit. The reference voltage input by the same-direction input end of the operational amplifier U2 can be improved through the resistor R24, when the optical coupler OT3 does not work, the reference voltage is pulled down through the resistor R24, the voltage of the reverse input end of the operational amplifier U2 is kept larger than the reference voltage, the output end of the operational amplifier U2 is kept at a low level, and lamp flash caused by repeated action of the operational amplifier U2 is avoided.
Alternatively, the control level generating unit 110 includes a second control level generating unit 112, and the second control level generating unit 112 includes a second switch circuit, a third switch circuit, and a diode D7; the third end of the second switch circuit is used for connecting a positive input end of an external control signal, the first end of the second switch circuit is connected with the anode of the diode D7, the cathode of the diode D7 is used for connecting a negative input end of the external control signal, the second end of the second switch circuit is connected with the third end of the third switch circuit, the first end of the third switch circuit is connected with the anode of the diode D7, and the second end of the third switch circuit is connected with the second end of the optical coupler OT 3. Specifically, the second switch circuit is driven to be turned on or off by an external control signal, and the third switch circuit is turned off when the second switch circuit is turned on and turned on when the second switch circuit is turned off. The optical coupler OT3 is turned on when the third switching circuit is turned on, and is turned off when the third switching circuit is turned off. The diode D7 is used to prevent the negative input terminal of the external control signal from signal backward flow.
Optionally, the second switching circuit includes a fourth switching tube, a resistor R33 and a resistor R28; the first end of the fourth switching tube is connected with the first end of the resistor R33 and the anode of the diode D7, the third end of the fourth switching tube is connected with the second end of the resistor R33 and the first end of the resistor R28, the second end of the resistor R28 is used for connecting the positive input end of an external control signal, and the second end of the fourth switching tube is connected with the third end of the third switching circuit; specifically, the second switch circuit may be formed by a fourth switch tube and a peripheral circuit thereof. The fourth switching tube can adopt a transistor Q6, an emitter of the transistor Q6 is connected with a first end of a resistor R33 and an anode of a diode D7, a base of the transistor Q6 is connected with a second end of a resistor R33 and a first end of a resistor R28, and a collector of the transistor Q6 is connected to the third switching circuit to drive the third switching circuit to act.
Optionally, the third switch circuit includes a fifth switch tube, a resistor R39 and a resistor R30; the first end of the fifth switching tube is connected with the first end of the resistor R39 and the anode of the diode D7, the second end of the fifth switching tube is optically coupled to the second end of the OT3, the third end of the fifth switching tube is connected with the second end of the resistor R39, the second end of the second switching circuit and the first end of the resistor R30, and the second end of the resistor R30 is used for being connected with a second power supply voltage. Specifically, the third switch circuit may be composed of a fifth switch tube and a peripheral circuit thereof. The fifth switching tube may be a MOS tube Q7. The source of the MOS transistor Q7 is connected to the anode of the diode D7, and the gate of the MOS transistor Q7 is connected to the collector of the transistor Q6 via the resistor R26, and is driven to turn on or turn off by the transistor Q6. In one embodiment, when the external control signal PS-ON + is high, the transistor Q6 is turned ON, driving the MOS transistor Q7 to turn off, so that the opto-coupler OT3 is turned off. ON the contrary, when the PS-ON is in a low level, the triode Q6 is turned off, the MOS transistor Q7 is driven to be conducted, and the optical coupler OT3 is conducted.
In addition, a driving power supply of the present invention includes the power supply control circuit as described in any one of the above. The power supply control circuit is connected to the negative output end of the driving power supply, so that the connection or disconnection between the negative output end of the driving power supply and the ground is realized, and the output of the driving power supply is finally controlled.
In addition, the lamp comprises the driving power supply. Specifically, the lamp power supply by the driving power supply is realized, wherein the power supply control circuit is connected between the negative electrode input end of the driving power supply for supplying power to the lamp and the ground of the lamp working circuit, so that the power supply control of the lamp working circuit can be realized.
Based on the above content, in the dimmable non-isolated power supply, after the ground wire is connected, because the output positive wire and the Y capacitor, and the junction capacitors between the lamp bead and the lamp panel form a loop, the circuit does not work only by turning off the IC, and the effect of complete turn-off cannot be realized, if the control circuit is added to the power output negative electrode, the power output negative electrode is really disconnected, and thus complete turn-off is realized. When the circuit is applied to the UV industry, the switch module inside the power supply can be respectively controlled by the dimming control module and the other external PS-ON signal output module, the trouble of an external relay can be avoided, and the circuit is integrated in the power supply, so that 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 output negative electrode, the requirement of quick response of on-off can be met in the UV industry.
It should be understood that the above examples only represent the preferred embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, 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 (10)
1. A power control circuit, comprising: the device comprises a control level generating unit, an isolating switch, a driving unit and a switching unit;
the control level generating unit is used for generating a control level;
the isolating switch is connected with the control level generating unit and used for receiving the control level to be switched on or switched off;
the driving unit is connected with the isolating switch and used for outputting a corresponding driving level according to the connection or disconnection of the isolating switch;
the switch unit is connected with the drive unit, the negative electrode output end of the power supply and the ground and used for receiving the drive level to be switched on or switched off.
2. The power supply control circuit according to claim 1, wherein the driving unit comprises a reference voltage chip U3, a voltage regulator ZD1, a voltage regulator ZD2, a first switching tube, a resistor R35, a resistor R34 and a resistor R2;
a first end of the reference voltage chip U3 is connected to a first end of the resistor R2 and a cathode of the zener diode ZD1, a third end of the reference voltage chip U3 is connected to a fourth end of the isolating switch and a first end of the resistor R35, a second end of the resistor R2, a first end of the resistor R34 and a first end of the first switch tube are respectively connected to a first power voltage, a second end of the first switch tube is connected to the switch unit, a third end of the first switch tube is connected to an anode of the zener diode ZD1 and a cathode of the zener diode ZD2, an anode of the zener diode ZD2, a second end of the reference voltage chip U3 and a second end of the resistor R35 are grounded, and a second end of the resistor R34 is connected to a third end of the isolating switch.
3. The power supply control circuit of claim 2, wherein the isolation switch comprises an optical coupling OT3 and a resistor R27;
the first end of opto-coupler OT3 is connected the first end of resistance R27, the second end of resistance R27 is used for connecting second mains voltage, the second end of opto-coupler OT3 is connected control level generation unit, the third end of opto-coupler OT3 is connected the first end of resistance R34, the fourth end of opto-coupler OT3 is connected the first end of resistance R35 with the third end of reference voltage chip U3.
4. The power control circuit of claim 2, wherein the switch unit comprises a second switch tube and a resistor R1;
the first end of the second switch tube is grounded, the second end of the second switch tube is connected with the negative output end of the power supply and the first end of the resistor R1, and the third end of the second switch tube is connected with the second end of the first switch tube and the second end of the resistor R1.
5. The power supply control circuit according to claim 3, wherein the control level generating unit comprises a dimming chip U1, a comparing circuit and a first switching circuit;
the fifth pin of the dimming chip U1 is used for connecting the positive input end of the dimming signal, the third pin of the dimming chip U1 is connected to the first input end of the comparison circuit, the fourth pin of the dimming chip U1 is connected to the second input end of the comparison circuit, the output end of the comparison circuit is connected to the third end of the first switch circuit, the first end of the first switch circuit is connected to the negative input end of the dimming signal, and the second end of the first switch circuit is connected to the second end of the optical coupler OT 3.
6. The power control circuit of claim 5,
the first switch circuit comprises a third switch tube, a resistor R29 and a resistor R26; a first end of the third switching tube is connected with a first end of the resistor R29 and a negative input end of the dimming signal, a second end of the third switching tube is connected with a second end of the opto-coupler OT3, a third end of the third switching tube is connected with a second end of the resistor R29 and a first end of the resistor R26, and a second end of the resistor R26 is connected with an output end of the comparison circuit; and/or
The comparison circuit comprises an operational amplifier U2, a resistor R20, a resistor R19, a resistor R18 and a resistor R24; the inverting input end of the operational amplifier U2 is connected to the fourth pin of the dimming chip U1 through the resistor R20, the non-inverting input end of the operational amplifier U2 is connected to the first end of the resistor R19, the first end of the resistor R18 and the first end of the resistor R24, the second end of the resistor R19 is connected to the third pin of the dimming chip U1, the second end of the resistor R18 is connected to the negative input end of the dimming signal, and the second end of the resistor R24 is connected to the output end of the operational amplifier U2 and the third end of the first switch circuit.
7. The power supply control circuit according to claim 3, wherein the control level generating unit includes a second switching circuit, a third switching circuit, and a diode D7;
the third end of the second switch circuit is used for connecting a positive input end of an external control signal, the first end of the second switch circuit is connected with the anode of the diode D7, the cathode of the diode D7 is used for connecting a negative input end of the external control signal, the second end of the second switch circuit is connected with the third end of the third switch circuit, the first end of the third switch circuit is connected with the anode of the diode D7, and the second end of the third switch circuit is connected with the second end of the optical coupler OT 3.
8. The power control circuit of claim 7,
the second switch circuit comprises a fourth switch tube, a resistor R33 and a resistor R28; a first end of the fourth switching tube is connected to the first end of the resistor R33 and the anode of the diode D7, a third end of the fourth switching tube is connected to the second end of the resistor R33 and the first end of the resistor R28, a second end of the resistor R28 is used for connecting a positive input end of the external control signal, and a second end of the fourth switching tube is connected to the third end of the third switching circuit; and/or
The third switching circuit comprises a fifth switching tube, a resistor R39 and a resistor R30; the first end of the fifth switching tube is connected with the first end of the resistor R39 and the anode of the diode D7, the second end of the fifth switching tube is connected with the second end of the optical coupler OT3, the third end of the fifth switching tube is connected with the second end of the resistor R39, the second end of the second switching circuit and the first end of the resistor R30, and the second end of the resistor R30 is used for being connected with the second power supply voltage.
9. A driving power supply comprising the power supply control circuit according to any one of claims 1 to 8.
10. A lamp comprising the driving power supply according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123001044.0U CN216852444U (en) | 2021-12-01 | 2021-12-01 | Power control circuit, driving power supply and lamp |
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| CN202123001044.0U CN216852444U (en) | 2021-12-01 | 2021-12-01 | Power control circuit, driving power supply and lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI831296B (en) * | 2022-07-15 | 2024-02-01 | 光寶科技股份有限公司 | Electronic circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI831296B (en) * | 2022-07-15 | 2024-02-01 | 光寶科技股份有限公司 | Electronic circuit |
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