CN216820151U - Color temperature switching circuit and driving power supply based on discrete component - Google Patents
Color temperature switching circuit and driving power supply based on discrete component Download PDFInfo
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- CN216820151U CN216820151U CN202123064646.0U CN202123064646U CN216820151U CN 216820151 U CN216820151 U CN 216820151U CN 202123064646 U CN202123064646 U CN 202123064646U CN 216820151 U CN216820151 U CN 216820151U
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Abstract
The utility model relates to a color temperature switching circuit and a driving power supply based on discrete components, which comprise a short-circuit protection circuit, a switch circuit, a switching circuit, a non-optical coupling isolation circuit and a driving circuit; the short-circuit protection circuit is used for detecting the output voltage of the output end of the driving power supply and outputting a short-circuit protection signal to the switch circuit when the output end of the driving power supply is short-circuited so as to control the switch circuit to trigger short-circuit protection; the driving circuit is used for driving the switching circuit to output a switching signal to the switching circuit according to the driving signal so as to control the switching circuit to control the on or off of the lamp. The color temperature switching circuit is directly powered by the output voltage of the driving power supply, an additional power supply system is not needed, the circuit structure is simple, the cost is low, non-optical coupling isolation is adopted, transmission delay is avoided, and meanwhile, the short circuit protection function can be achieved.
Description
Technical Field
The utility model relates to the technical field of driving power supplies, in particular to a color temperature switching circuit based on discrete components and a driving power supply.
Background
In the present colour temperature switching circuit who adopts discrete component to constitute, need add power supply system in addition for the circuit drive to lead to circuit structure complicacy, with high costs, the isolation of present scheme input and output adopts the opto-coupler to keep apart moreover, and this kind of scheme can lead to the transmission to produce the time delay, reduces the switching effect, and when the output short circuit appears, also do not have corresponding short-circuit protection measure, makes the security and the reliability greatly reduced of product.
SUMMERY OF THE UTILITY MODEL
The utility model provides a color temperature switching circuit and a driving power supply based on discrete components, aiming at the defects of the prior art.
The technical scheme adopted by the utility model for solving the technical problem is as follows: constructing a discrete component-based color temperature switching circuit, comprising: the circuit comprises a short-circuit protection circuit, a switch circuit, a switching circuit, a non-optical coupling isolation circuit and a drive circuit;
the input end of the short-circuit protection circuit is connected with the output end of the driving power supply, and the output end of the short-circuit protection circuit is connected with the switch circuit; the driving circuit, the non-optical coupling isolation circuit, the switching circuit and the switch circuit are sequentially connected, and the input end of the driving circuit also receives a driving signal; the switch circuit is also connected with the output end of the driving power supply through a lamp;
the short-circuit protection circuit is used for detecting the output voltage of the output end of the driving power supply and outputting a short-circuit protection signal to the switch circuit when the output end of the driving power supply is short-circuited so as to control the switch circuit to trigger short-circuit protection; the driving circuit is used for driving the switching circuit to output a switching signal to the switching circuit according to the driving signal so as to control the switching circuit to control the on or off of the lamp.
In the discrete component-based color temperature switching circuit of the present invention, the short-circuit protection circuit includes: a detection circuit and a trigger circuit;
the input end of the detection circuit is connected with the negative electrode of the lamp, the output end of the detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the switch circuit.
In the discrete component-based color temperature switching circuit of the present invention, the lamp includes: a first LED unit and a second LED unit; the negative pole of the lamp comprises: a negative electrode of the first LED unit and a negative electrode of the second LED unit; the switching circuit includes: a first input terminal, a second input terminal, a first output terminal and a second output terminal;
the input terminal of the detection circuit comprises: a first sub-input and a second sub-input; the output end of the trigger circuit comprises: a first sub-output terminal and a second sub-output terminal;
a first sub-input end of the detection circuit is connected with the cathode of the first LED unit, and a second sub-input end of the detection circuit is connected with the cathode of the second LED unit;
the first input end of the switch circuit is connected with the first sub-output end of the trigger circuit, and the second input end of the switch circuit is connected with the second sub-output end of the trigger circuit;
the first output end of the switch circuit is connected with the negative electrode of the first LED unit, the second output end of the switch circuit is connected with the negative electrode of the second LED unit, and the positive electrode of the first LED unit and the positive electrode of the second LED unit are connected with the output end of the driving power supply.
In the discrete component-based color temperature switching circuit of the present invention, the detection circuit includes: the first diode, the second diode, the first voltage-regulator tube and the ninth resistor;
the anode of the first diode is used as a first sub-input end of the detection circuit and connected with the cathode of the first LED unit, and the anode of the second diode is used as a second sub-input end of the detection circuit and connected with the cathode of the second LED unit;
the cathode of the first diode is connected with the cathode of the first voltage-stabilizing tube, the cathode of the second diode is connected with the cathode of the first voltage-stabilizing tube, and the anode of the first voltage-stabilizing tube is connected with the input end of the trigger circuit through the ninth resistor.
In the discrete component-based color temperature switching circuit of the present invention, the detection circuit includes: the first diode, the second diode, the ninth resistor and the tenth resistor;
the anode of the first diode is used as a first sub-input end of the detection circuit and connected with the cathode of the first LED unit, and the anode of the second diode is used as a second sub-input end of the detection circuit and connected with the cathode of the second LED unit;
the cathode of the first diode and the cathode of the second diode are connected with the first end of the ninth resistor, the second end of the ninth resistor is connected with the first end of the tenth resistor and connected with the input end of the trigger circuit, and the second end of the tenth resistor is grounded.
In the discrete component-based color temperature switching circuit of the present invention, the flip-flop circuit includes: the circuit comprises a first triode, a photoelectric coupler, an eleventh resistor, a third diode and a fourth diode;
a base electrode of the first triode is used as an input end of the trigger circuit and is connected with a second end of the ninth resistor, an emitting electrode of the first triode is grounded, a collecting electrode of the first triode is connected with a negative electrode of a light emitting part of the photoelectric coupler, and a positive electrode of the light emitting part of the photoelectric coupler is connected with an output end of the driving power supply through the eleventh resistor;
the second end of the receiving part of the photoelectric coupler is grounded, and the first end of the receiving part of the photoelectric coupler is connected with the cathode of the third diode and the cathode of the fourth diode; the anode of the third diode is used as the first sub-output end of the trigger circuit and connected with the first input end of the switch circuit, and the anode of the fourth diode is used as the second sub-output end of the trigger circuit and connected with the second input end of the switch circuit.
In the discrete component-based color temperature switching circuit of the present invention, the driving circuit includes: the MOS transistor comprises a first resistor, a second MOS transistor and a third resistor;
the first end of first resistance is regarded as drive circuit's input is received drive signal, the second end of first resistance is connected the grid of second MOS pipe with the first end of second resistance, the second end of second resistance with the source electrode ground connection of second MOS pipe, the drain electrode of second MOS pipe passes through third resistance connects drive power supply's output, the drain electrode of second MOS pipe still is connected to non-opto-coupler isolation circuit's input.
In the color temperature switching circuit based on discrete components of the present invention, the non-optically coupled isolation circuit includes: a fifth diode;
and the anode of the fifth diode is used as the input end of the non-optical coupling isolation circuit and is connected with the drain electrode of the second MOS tube, and the cathode of the fifth diode is connected with the input end of the switching circuit.
In the discrete component-based color temperature switching circuit of the present invention, the switching circuit includes: the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the third triode and the ninth triode;
a base electrode of the third triode is used as an input end of the switching circuit and is connected with a cathode of the fifth diode, an emitting electrode of the third triode, a second end of the fifth resistor, an emitting electrode of the ninth triode and a second end of the eighth resistor are grounded;
a collector of the third triode is connected with the output end of the driving power supply through the fourth resistor, the collector of the third triode is connected with a first end of the fifth resistor and a first end of the sixth resistor, and a connecting end of the first end of the fifth resistor and the first end of the sixth resistor is also connected with a first input end of the switch circuit;
the second end of the sixth resistor is connected with the base of the ninth triode, the collector of the ninth triode is connected with the second end of the seventh resistor and the first end of the eighth resistor, the connecting end of the second end of the seventh resistor and the first end of the eighth resistor is further connected to the second input end of the switch circuit, and the first end of the seventh resistor is connected with the output end of the driving power supply.
In the discrete component-based color temperature switching circuit of the present invention, the switching circuit includes: the fourth resistor, the second voltage-regulator tube, the sixth resistor, the seventh resistor, the third voltage-regulator tube, the third triode and the ninth triode;
a base electrode of the third triode is used as an input end of the switching circuit and is connected with a cathode of the fifth diode, an emitting electrode of the third triode and an anode of the second voltage-regulator tube, and an emitting electrode of the ninth triode and an anode of the third voltage-regulator tube are grounded;
a collector of the third triode is connected with the output end of the driving power supply through the fourth resistor, the collector of the third triode is connected with the negative electrode of the second voltage-regulator tube and the first end of the sixth resistor, and the connecting end of the negative electrode of the second voltage-regulator tube and the first end of the sixth resistor is also connected with the first input end of the switch circuit;
the second end of the sixth resistor is connected with the base electrode of the ninth triode, the collector electrode of the ninth triode is connected with the second end of the seventh resistor and the negative electrode of the third voltage-regulator tube, the connecting end of the second end of the seventh resistor and the negative electrode of the third voltage-regulator tube is further connected with the second input end of the switch circuit, and the first end of the seventh resistor is connected with the output end of the driving power supply.
In the discrete component-based color temperature switching circuit of the present invention, the switching circuit includes: a switch chip; the switch chip includes: the first control pin, the second control pin, the first output pin and the second output pin;
the first control pin is used as a first input end of the switch circuit and connected with a first end of the sixth resistor, and the second control pin is used as a second input end of the switch circuit and connected with a second end of the seventh resistor;
the first output pin is used as a first output end of the switch circuit and connected with the cathode of the first LED unit, and the second output pin is used as a second output end of the switch circuit and connected with the cathode of the second LED unit.
In the discrete component-based color temperature switching circuit of the present invention, the switching circuit includes: a fifth MOS transistor and a sixth MOS transistor;
a grid electrode of the fifth MOS tube is used as a second input end of the switch circuit and connected with a second end of the seventh resistor, a source electrode of the fifth MOS tube is grounded, and a drain electrode of the fifth MOS tube is used as a second output end of the switch circuit and connected with a negative electrode of the second LED unit;
the grid electrode of the sixth MOS tube is used as the first input end of the switch circuit and connected with the first end of the sixth resistor, the source electrode of the sixth MOS tube is grounded, and the drain electrode of the sixth MOS tube is used as the first output end of the switch circuit and connected with the negative electrode of the first LED unit.
In the discrete component-based color temperature switching circuit of the utility model, the first LED unit includes a plurality of LED lamps connected in series or in parallel; the second LED unit includes a plurality of LED lamps connected in series or in parallel.
The utility model also provides a driving power supply which comprises the color temperature switching circuit based on the discrete component.
The color temperature switching circuit and the driving power supply based on the discrete components have the following beneficial effects: the circuit comprises a short-circuit protection circuit, a switch circuit, a switching circuit, a non-optical coupling isolation circuit and a drive circuit; the short-circuit protection circuit is used for detecting the output voltage of the output end of the driving power supply and outputting a short-circuit protection signal to the switch circuit when the output end of the driving power supply is short-circuited so as to control the switch circuit to trigger short-circuit protection; the driving circuit is used for driving the switching circuit to output a switching signal to the switching circuit according to the driving signal so as to control the switching circuit to control the on or off of the lamp. The color temperature switching circuit is directly powered by the output voltage of the driving power supply, an additional power supply system is not needed, the circuit structure is simple, the cost is low, non-optical coupling isolation is adopted, transmission delay is avoided, and meanwhile, the short circuit protection effect can be achieved.
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 color temperature switching circuit based on discrete components according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a first embodiment of a color temperature switching circuit based on discrete components according to the present invention;
FIG. 3 is a circuit diagram of a second embodiment of a color temperature switching circuit based on discrete components according to the present invention;
FIG. 4 is a circuit diagram of a third embodiment of the color temperature switching circuit based on discrete components according to the present invention;
fig. 5 is a circuit diagram of an embodiment four 0 of the color temperature switching circuit based on discrete components provided by 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, a schematic block diagram of an alternative embodiment of the color temperature switching circuit based on discrete components provided by the present invention is shown.
This colour temperature switching circuit 30 based on discrete component adopts discrete component to realize the colour temperature and switches, the output that adopts the power directly supplies power, need not set up extra power supply system, the circuit structure of colour temperature switching circuit 30 has been simplified greatly, and is with low costs, and adopt the isolated mode of non-opto-coupler to keep apart, avoid adopting the produced transmission delay's of optoelectronic isolation problem, and simultaneously, can also detect the output voltage of drive power supply's output, when the output short circuit appears, can directly turn-off, reach short-circuit protection's effect.
Specifically, as shown in fig. 1, the discrete component-based color temperature switching circuit 30 includes: short-circuit protection circuit 50, switching circuit 40, switching circuit 30, non-optical coupling isolation circuit 20 and drive circuit 10.
The input end of the short-circuit protection circuit 50 is connected with the output end of the driving power supply, and the output end of the short-circuit protection circuit 50 is connected with the switch circuit 40; the driving circuit 10, the non-optical coupling isolation circuit 20, the switching circuit 30 and the switch circuit 40 are connected in sequence, and the input end of the driving circuit 10 also receives a driving signal; the switching circuit 40 is also connected to the output terminal of the driving power source through the lamp 60.
The short-circuit protection circuit 50 is configured to detect an output voltage at the output terminal of the driving power supply, and output a short-circuit protection signal to the switch circuit 40 when the output terminal of the driving power supply is short-circuited, so as to control the switch circuit 40 to trigger short-circuit protection.
It can be understood that, when the output voltage of the output terminal of the driving power supply is detected by the short-circuit protection circuit 50 and the output terminal of the driving power supply is short-circuited, the short-circuit protection circuit 50 generates a corresponding short-circuit protection signal, and the short-circuit protection signal is transmitted to the switch circuit 40 to control the switch circuit 40 to turn off, so as to trigger the short-circuit protection and avoid the device damage or burning.
The driving circuit 10 is configured to drive the switching circuit 30 to output a switching signal to the switching circuit 40 according to the driving signal, so as to control the switching circuit 40 to control the lamp 60 to turn on or turn off.
It can be understood that, the switching circuit 40 is controlled by the switching circuit 30 to drive the switching circuit 40 to control the lamp 60 to be turned on or off, so as to achieve the purpose of color temperature switching.
Optionally, in some embodiments, the short-circuit protection circuit 50 includes: a detection circuit and a trigger circuit.
The input end of the detection circuit is connected with the cathode of the lamp 60, the output end of the detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the switch circuit 40.
Optionally, in some embodiments, the switching circuit 40 includes: a first input terminal, a second input terminal, a first output terminal, and a second output terminal.
The input end of the detection circuit comprises: a first sub-input and a second sub-input; the output of the trigger circuit comprises: a first sub-output terminal and a second sub-output terminal. The first sub-input end of the detection circuit is connected with the cathode of the first LED unit, and the second sub-input end of the detection circuit is connected with the cathode of the second LED unit. A first input terminal of the switch circuit 40 is connected to the first sub-output terminal of the trigger circuit, and a second input terminal of the switch circuit 40 is connected to the second sub-output terminal of the trigger circuit.
The first output end of the switch circuit 40 is connected with the cathode of the first LED unit, the second output end of the switch circuit 40 is connected with the cathode of the second LED unit, and the anode of the first LED unit and the anode of the second LED unit are connected with the output end of the driving power supply.
The following examples are given by way of illustration.
Specifically, referring to fig. 2, a circuit diagram of a first embodiment of the color temperature switching circuit 30 based on discrete components according to the present invention is shown.
As shown in fig. 2, in this embodiment, the lamp 60 includes: a first LED unit and a second LED unit. The negative electrode of the lamp 60 includes: a negative electrode of the first LED unit and a negative electrode of the second LED unit.
Optionally, the first LED unit includes a plurality of LED lamps connected in series or in parallel; the second LED unit includes a plurality of LED lamps connected in series or in parallel.
The first LED unit and the second LED unit shown in fig. 2 to 5 are both formed by connecting a plurality of LED lamps in series, after the plurality of LED lamps are sequentially connected in series, the positive electrode of the first LED lamp is used as the positive electrode of the first LED unit or the positive electrode of the second LED unit is connected to the output end of the driving power supply, and the negative electrode of the last LED lamp is used as the negative electrode (CW) of the first LED unit or the negative electrode (WW) of the second LED unit.
Optionally, the driving power supply according to the embodiment of the present invention may be an LED driving power supply, wherein the output end of the driving power supply is the LED + shown in fig. 2 to 5.
As shown in fig. 2, in this embodiment, the detection circuit includes: a first diode D1, a second diode D2, a first zener diode ZD1, and a ninth resistor R9.
The anode of the first diode D1 is connected to the cathode of the first LED unit as the first sub-input terminal of the detection circuit, and the anode of the second diode D2 is connected to the cathode of the second LED unit as the second sub-input terminal of the detection circuit.
The cathode of the first diode D1 is connected with the cathode of the first voltage-regulator tube ZD1, the cathode of the second diode D2 is connected with the cathode of the first voltage-regulator tube ZD1, and the anode of the first voltage-regulator tube ZD1 is connected with the input end of the trigger circuit through a ninth resistor R9.
As shown in fig. 2, in this embodiment, the trigger circuit includes: the circuit comprises a first triode Q1, a photoelectric coupler U3-A, an eleventh resistor R11, a third diode D3 and a fourth diode D4.
The base electrode of the first triode Q1 is used as the input end of the trigger circuit and is connected with the second end of the ninth resistor R9, the emitting electrode of the first triode Q1 is grounded, the collecting electrode of the first triode Q1 is connected with the negative electrode of the light-emitting part of the photoelectric coupler U3-A, and the positive electrode of the light-emitting part of the photoelectric coupler U3-A is connected with the output end of the driving power supply through the eleventh resistor R11.
The second end of the receiving part of the photocoupler U3-A is grounded, and the first end of the receiving part of the photocoupler U3-A is connected with the cathode of the third diode D3 and the cathode of the fourth diode D4; the anode of the third diode D3 is connected to the first input terminal of the switch circuit 40 as the first sub-output terminal of the trigger circuit, and the anode of the fourth diode D4 is connected to the second input terminal of the switch circuit 40 as the second sub-output terminal of the trigger circuit.
As shown in fig. 2, in this embodiment, the drive circuit 10 includes: the circuit comprises a first resistor R1, a second resistor R2, a second MOS transistor Q2 and a third resistor R3.
The first end of the first resistor R1 is used as the input end of the driving circuit 10 to receive a driving signal, the second end of the first resistor R1 is connected to the gate of the second MOS transistor Q2 and the first end of the second resistor R2, the second end of the second resistor R2 and the source of the second MOS transistor Q2 are grounded, the drain of the second MOS transistor Q2 is connected to the output end of the driving power supply through the third resistor R3, and the drain of the second MOS transistor Q2 is further connected to the input end of the non-optical coupling isolation circuit 20.
As shown in fig. 2, in this embodiment, the non-optically coupled isolation circuit 20 includes: and a fifth diode D5.
An anode of the fifth diode D5 is connected to the drain of the second MOS transistor Q2 as the input terminal of the non-optically coupled isolation circuit 20, and a cathode of the fifth diode D5 is connected to the input terminal of the switching circuit 30.
As shown in fig. 2, in this embodiment, the switching circuit 30 includes: the circuit comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third triode Q3 and a ninth triode Q9.
The base of the third transistor Q3 is connected to the cathode of the fifth diode D5 as the input terminal of the switching circuit 30, the emitter of the third transistor Q3, the second terminal of the fifth resistor R5, the emitter of the ninth transistor Q9, and the second terminal of the eighth resistor R8 are grounded.
The collector of the third transistor Q3 is connected to the output terminal of the driving power supply through a fourth resistor R4, the collector of the third transistor Q3 is connected to the first terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6, and the connection terminal of the first terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6 is further connected to the first input terminal of the switch circuit 40.
The second end of the sixth resistor R6 is connected to the base of the ninth transistor Q9, the collector of the ninth transistor Q9 is connected to the second end of the seventh resistor R7 and the first end of the eighth resistor R8, the connection end of the second end of the seventh resistor R7 and the first end of the eighth resistor R8 is further connected to the second input end of the switch circuit 40, and the first end of the seventh resistor R7 is connected to the output end of the driving power supply.
As shown in fig. 2, in this embodiment, the switching circuit 40 includes: a switch chip U1; the switch chip U1 includes: a first control pin (G1 in fig. 2), a second control pin (G2 in fig. 2), a first output pin (D1 in fig. 2), and a second output pin (D2 in fig. 2).
The first control pin is connected to a first terminal of the sixth resistor R6 as a first input terminal of the switch circuit 40, and the second control pin is connected to a second terminal of the seventh resistor R7 as a second input terminal of the switch circuit 40.
The first output pin is used as a first output end of the switch circuit 40 and connected with the cathode of the first LED unit, and the second output pin is used as a second output end of the switch circuit 40 and connected with the cathode of the second LED unit.
It is to be understood that, on the basis of the first embodiment, other implementations may also be adopted.
For example, referring to fig. 3, a circuit diagram of a second embodiment of the color temperature switching circuit 30 based on discrete components according to the present invention is shown.
Specifically, as shown in fig. 3, in this embodiment, the switch circuit 40 includes: a fifth MOS transistor Q5 and a sixth MOS transistor Q6.
The gate of the fifth MOS transistor Q5 is connected to the second end of the seventh resistor R7 as the second input terminal of the switch circuit 40, the source of the fifth MOS transistor Q5 is grounded, and the drain of the fifth MOS transistor Q5 is connected to the cathode of the second LED unit as the second output terminal of the switch circuit 40.
The gate of the sixth MOS transistor Q6 is connected to the first end of the sixth resistor R6 as the first input terminal of the switch circuit 40, the source of the sixth MOS transistor Q6 is grounded, and the drain of the sixth MOS transistor Q6 is connected to the cathode of the first LED unit as the first output terminal of the switch circuit 40.
Namely, the difference between this embodiment and the first embodiment is: the switching chip U1 of the first embodiment is implemented by using two independent MOS transistors (a fifth MOS transistor Q5 and a sixth MOS transistor Q6), where the fifth MOS transistor Q5 and the sixth MOS transistor Q6 are both NMOS transistors.
Alternatively, in some other embodiments, referring to fig. 4, a circuit diagram of a third embodiment of the color temperature switching circuit 30 based on discrete components provided in the present invention is shown.
As shown in fig. 4, in this embodiment, the switching circuit 30 includes: a fourth resistor R4, a second regulator ZD2, a sixth resistor R6, a seventh resistor R7, a third regulator ZD3, a third triode Q3 and a ninth triode Q9.
The base of the third triode Q3 is used as the input end of the switching circuit 30 and is connected with the cathode of the fifth diode D5, the emitter of the third triode Q3, the anode of the second voltage regulator ZD2, the emitter of the ninth triode Q9 and the anode of the third voltage regulator ZD3 are grounded.
The collector of the third triode Q3 is connected with the output end of the driving power supply through a fourth resistor R4, the collector of the third triode Q3 is connected with the negative electrode of the second voltage regulator ZD2 and the first end of the sixth resistor R6, and the connection end of the negative electrode of the second voltage regulator ZD2 and the first end of the sixth resistor R6 is further connected to the first input end of the switch circuit 40.
The second end of the sixth resistor R6 is connected to the base of the ninth triode Q9, the collector of the ninth triode Q9 is connected to the second end of the seventh resistor R7 and the negative electrode of the third voltage regulator ZD3, the connection end of the second end of the seventh resistor R7 and the negative electrode of the third voltage regulator ZD3 is further connected to the second input end of the switch circuit 40, and the first end of the seventh resistor R7 is connected to the output end of the driving power supply.
As shown in fig. 4, the difference between this embodiment and the first embodiment is that the fifth resistor R5 in the switching circuit 30 is replaced by the second regulator ZD2, and the eighth resistor R8 is replaced by the third regulator ZD 3.
Alternatively, in some other embodiments, referring to fig. 5, a circuit diagram of a fourth embodiment of the color temperature switching circuit 30 based on discrete components provided by the present invention is shown.
As shown in fig. 5, in this embodiment, the detection circuit includes: a first diode D1, a second diode D2, a ninth resistor R9, and a tenth resistor R10.
The anode of the first diode D1 is connected to the cathode of the first LED unit as the first sub-input terminal of the detection circuit, and the anode of the second diode D2 is connected to the cathode of the second LED unit as the second sub-input terminal of the detection circuit.
The cathode of the first diode D1 and the cathode of the second diode D2 are connected to the first end of the ninth resistor R9, the second end of the ninth resistor R9 is connected to the first end of the tenth resistor R10 and to the input end of the trigger circuit, and the second end of the tenth resistor R10 is grounded.
As shown in fig. 5, the difference between this embodiment and the first embodiment is that the first zener tube ZD1 is deleted and the tenth resistor R10 is added.
As shown in fig. 2 to 5, the PWM is a driving signal, the first resistor R1 is a current limiting resistor for current limiting, and the second resistor R2 is an interference preventing resistor for interference preventing the second MOS transistor Q2 from being triggered by mistake. The third resistor R3 is a pull-up resistor, and is used for obtaining a supply voltage from the output end of the driving power supply to the second MOS transistor Q2. The fifth diode D5 is used for performing isolation control, and effectively isolates the front stage and the rear stage through the fifth diode D5, that is, when the second MOS transistor Q2 is turned on, the fifth diode D5 prevents the output current from flowing into the second MOS transistor Q2, so that the second MOS transistor Q2 is well protected, and the driving power supply can normally and stably operate.
As shown in fig. 2 to 5, the LED + is detected by connecting the first diode D1 or the second diode D2 in series with the first zener diode ZD1 and the ninth resistor R9 (or connecting the ninth resistor R9 and the tenth resistor R10 in series) and the first triode Q1, when the output short circuit occurs, the first triode Q1 is turned on, so that the photocoupler U3-a is turned on, and after the photocoupler U3-a is turned on, the first input terminal and the second input terminal of the switching chip U1 are respectively pulled down by the third diode D3 and the fourth diode D4 (or the gate of the sixth MOS Q6 and the gate of the fifth MOS Q5 are pulled down), so that the switching chip U1 is turned off (or the sixth MOS Q6 and the fifth MOS Q5 are turned off (turned off), thereby playing a role of short circuit protection.
It should be noted that, the transistor used in the embodiment of the present invention may be replaced by an MOS transistor, and conversely, the MOS transistor used may also be replaced by a transistor.
Alternatively, in some other embodiments, the utility model further provides a driving power supply. The driving power supply comprises a color temperature switching circuit 30 based on discrete components disclosed in the embodiment of the utility model.
Alternatively, the driving power supply may be an LED driving power supply.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the 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 discrete component-based color temperature switching circuit, comprising: the circuit comprises a short-circuit protection circuit, a switch circuit, a switching circuit, a non-optical coupling isolation circuit and a drive circuit;
the input end of the short-circuit protection circuit is connected with the output end of the driving power supply, and the output end of the short-circuit protection circuit is connected with the switch circuit; the driving circuit, the non-optical coupling isolation circuit, the switching circuit and the switch circuit are sequentially connected, and the input end of the driving circuit also receives a driving signal; the switch circuit is also connected with the output end of the driving power supply through a lamp;
the short-circuit protection circuit is used for detecting the output voltage of the output end of the driving power supply and outputting a short-circuit protection signal to the switch circuit when the output end of the driving power supply is short-circuited so as to control the switch circuit to trigger short-circuit protection; the driving circuit is used for driving the switching circuit to output a switching signal to the switching circuit according to the driving signal so as to control the switching circuit to control the on or off of the lamp.
2. The discrete component-based color temperature switching circuit of claim 1, wherein the short-circuit protection circuit comprises: a detection circuit and a trigger circuit;
the input end of the detection circuit is connected with the negative electrode of the lamp, the output end of the detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the switch circuit.
3. The discrete component-based color temperature switching circuit of claim 2, wherein the light fixture comprises: a first LED unit and a second LED unit; the negative pole of lamps and lanterns includes: a negative electrode of the first LED unit and a negative electrode of the second LED unit; the switching circuit includes: a first input terminal, a second input terminal, a first output terminal and a second output terminal;
the input end of the detection circuit comprises: a first sub-input and a second sub-input; the output end of the trigger circuit comprises: a first sub-output terminal and a second sub-output terminal;
a first sub-input end of the detection circuit is connected with the cathode of the first LED unit, and a second sub-input end of the detection circuit is connected with the cathode of the second LED unit;
the first input end of the switch circuit is connected with the first sub-output end of the trigger circuit, and the second input end of the switch circuit is connected with the second sub-output end of the trigger circuit;
the first output end of the switch circuit is connected with the negative electrode of the first LED unit, the second output end of the switch circuit is connected with the negative electrode of the second LED unit, and the positive electrode of the first LED unit and the positive electrode of the second LED unit are connected with the output end of the driving power supply.
4. The discrete component-based color temperature switching circuit of claim 3, wherein the detection circuit comprises: the first diode, the second diode, the first voltage-regulator tube and the ninth resistor;
the anode of the first diode is used as a first sub-input end of the detection circuit and connected with the cathode of the first LED unit, and the anode of the second diode is used as a second sub-input end of the detection circuit and connected with the cathode of the second LED unit;
the cathode of the first diode is connected with the cathode of the first voltage-stabilizing tube, the cathode of the second diode is connected with the cathode of the first voltage-stabilizing tube, and the anode of the first voltage-stabilizing tube is connected with the input end of the trigger circuit through the ninth resistor.
5. The discrete component-based color temperature switching circuit of claim 3, wherein the detection circuit comprises: the first diode, the second diode, the ninth resistor and the tenth resistor;
the anode of the first diode is used as a first sub-input end of the detection circuit and connected with the cathode of the first LED unit, and the anode of the second diode is used as a second sub-input end of the detection circuit and connected with the cathode of the second LED unit;
the cathode of the first diode and the cathode of the second diode are connected with the first end of the ninth resistor, the second end of the ninth resistor is connected with the first end of the tenth resistor and connected with the input end of the trigger circuit, and the second end of the tenth resistor is grounded.
6. The discrete component-based color temperature switching circuit according to claim 4 or 5, wherein the trigger circuit comprises: the circuit comprises a first triode, a photoelectric coupler, an eleventh resistor, a third diode and a fourth diode;
a base electrode of the first triode is used as an input end of the trigger circuit and is connected with a second end of the ninth resistor, an emitting electrode of the first triode is grounded, a collecting electrode of the first triode is connected with a negative electrode of a light emitting part of the photoelectric coupler, and a positive electrode of the light emitting part of the photoelectric coupler is connected with an output end of the driving power supply through the eleventh resistor;
the second end of the receiving part of the photoelectric coupler is grounded, and the first end of the receiving part of the photoelectric coupler is connected with the cathode of the third diode and the cathode of the fourth diode; the anode of the third diode is used as the first sub-output end of the trigger circuit and connected with the first input end of the switch circuit, and the anode of the fourth diode is used as the second sub-output end of the trigger circuit and connected with the second input end of the switch circuit.
7. The discrete component-based color temperature switching circuit of claim 6, wherein the driver circuit comprises: the MOS transistor comprises a first resistor, a second MOS transistor and a third resistor;
the first end of first resistance is regarded as drive circuit's input is received drive signal, the second end of first resistance is connected the grid of second MOS pipe with the first end of second resistance, the second end of second resistance with the source electrode ground connection of second MOS pipe, the drain electrode of second MOS pipe passes through third resistance connection drive power supply's output, the drain electrode of second MOS pipe still is connected to non-opto-coupler isolation circuit's input.
8. The discrete component-based color temperature switching circuit of claim 7, wherein the non-optically coupled isolation circuit comprises: a fifth diode;
and the anode of the fifth diode is used as the input end of the non-optical coupling isolation circuit and is connected with the drain electrode of the second MOS tube, and the cathode of the fifth diode is connected with the input end of the switching circuit.
9. The discrete component-based color temperature switching circuit of claim 8, wherein the switching circuit comprises: the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the third triode and the ninth triode;
a base electrode of the third triode is used as an input end of the switching circuit and is connected with a cathode of the fifth diode, an emitting electrode of the third triode, a second end of the fifth resistor, an emitting electrode of the ninth triode and a second end of the eighth resistor are grounded;
a collector of the third triode is connected with the output end of the driving power supply through the fourth resistor, the collector of the third triode is connected with a first end of the fifth resistor and a first end of the sixth resistor, and a connecting end of the first end of the fifth resistor and the first end of the sixth resistor is also connected with a first input end of the switch circuit;
the second end of the sixth resistor is connected with the base of the ninth triode, the collector of the ninth triode is connected with the second end of the seventh resistor and the first end of the eighth resistor, the connecting end of the second end of the seventh resistor and the first end of the eighth resistor is further connected to the second input end of the switch circuit, and the first end of the seventh resistor is connected with the output end of the driving power supply.
10. The discrete component-based color temperature switching circuit of claim 8, wherein the switching circuit comprises: the fourth resistor, the second voltage-regulator tube, the sixth resistor, the seventh resistor, the third voltage-regulator tube, the third triode and the ninth triode;
a base electrode of the third triode is used as an input end of the switching circuit and is connected with a cathode of the fifth diode, an emitting electrode of the third triode and an anode of the second voltage-regulator tube, and an emitting electrode of the ninth triode and an anode of the third voltage-regulator tube are grounded;
a collector of the third triode is connected with the output end of the driving power supply through the fourth resistor, the collector of the third triode is connected with the negative electrode of the second voltage-regulator tube and the first end of the sixth resistor, and the connecting end of the negative electrode of the second voltage-regulator tube and the first end of the sixth resistor is also connected with the first input end of the switch circuit;
the second end of the sixth resistor is connected with the base electrode of the ninth triode, the collector electrode of the ninth triode is connected with the second end of the seventh resistor and the negative electrode of the third voltage-regulator tube, the connecting end of the second end of the seventh resistor and the negative electrode of the third voltage-regulator tube is further connected with the second input end of the switch circuit, and the first end of the seventh resistor is connected with the output end of the driving power supply.
11. The discrete component-based color temperature switching circuit according to claim 9 or 10, wherein the switching circuit comprises: a switch chip; the switch chip includes: the first control pin, the second control pin, the first output pin and the second output pin;
the first control pin is used as a first input end of the switch circuit and connected with a first end of the sixth resistor, and the second control pin is used as a second input end of the switch circuit and connected with a second end of the seventh resistor;
the first output pin is used as a first output end of the switch circuit and connected with the cathode of the first LED unit, and the second output pin is used as a second output end of the switch circuit and connected with the cathode of the second LED unit.
12. The discrete component-based color temperature switching circuit according to claim 9 or 10, wherein the switching circuit comprises: a fifth MOS transistor and a sixth MOS transistor;
a grid electrode of the fifth MOS tube is used as a second input end of the switch circuit and connected with a second end of the seventh resistor, a source electrode of the fifth MOS tube is grounded, and a drain electrode of the fifth MOS tube is used as a second output end of the switch circuit and connected with a negative electrode of the second LED unit;
the grid electrode of the sixth MOS tube is used as the first input end of the switch circuit and connected with the first end of the sixth resistor, the source electrode of the sixth MOS tube is grounded, and the drain electrode of the sixth MOS tube is used as the first output end of the switch circuit and connected with the negative electrode of the first LED unit.
13. The discrete component-based color temperature switching circuit of claim 3, wherein the first LED unit comprises a plurality of LED lamps connected in series or in parallel; the second LED unit includes a plurality of LED lamps connected in series or in parallel.
14. A driving power supply comprising the discrete component-based color temperature switching circuit of any one of claims 1-13.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123064646.0U CN216820151U (en) | 2021-12-08 | 2021-12-08 | Color temperature switching circuit and driving power supply based on discrete component |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123064646.0U CN216820151U (en) | 2021-12-08 | 2021-12-08 | Color temperature switching circuit and driving power supply based on discrete component |
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| CN216820151U true CN216820151U (en) | 2022-06-24 |
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|---|---|---|---|
| CN202123064646.0U Active CN216820151U (en) | 2021-12-08 | 2021-12-08 | Color temperature switching circuit and driving power supply based on discrete component |
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| Country | Link |
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| CN (1) | CN216820151U (en) |
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