CN213186632U - Chip driving circuit, chip, linear constant current driving circuit and lighting device - Google Patents

Chip driving circuit, chip, linear constant current driving circuit and lighting device Download PDF

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Publication number
CN213186632U
CN213186632U CN202021041139.8U CN202021041139U CN213186632U CN 213186632 U CN213186632 U CN 213186632U CN 202021041139 U CN202021041139 U CN 202021041139U CN 213186632 U CN213186632 U CN 213186632U
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current source
circuit
power supply
load
energy
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邵蕴奇
徐勇
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Shanghai Looall Electronics Co ltd
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Shanghai Looall Electronics Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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Abstract

The utility model discloses a chip driving circuit, a chip, a linear constant current driving circuit and a lighting device, which comprises a first current source, a second current source, a change-over switch and a control circuit; one end of the first current source and one end of the second current source are connected with one end of an external power supply after being connected with each other, and the other end of the first current source and the other end of the second current source are respectively connected with the outside; the control circuit detects current or voltage parameters in the circuit and controls the on/off of the selector switch and the first current source; when the change-over switch is switched on, the external load connected with the change-over switch in parallel is bypassed, and when the change-over switch is switched off, the external load connected with the change-over switch in parallel is switched on.

Description

Chip driving circuit, chip, linear constant current driving circuit and lighting device
The present application claims priority from chinese patent application CN201910493482.1 filed 2019, 6/6.
The present application claims priority from chinese patent application CN201911106939.5 filed on 2019, 11/13/h.
The present application refers to the above-mentioned chinese patent application in its entirety.
Technical Field
The utility model relates to a drive circuit field, in particular to chip drive circuit, chip, linear constant current drive circuit and lighting device.
Background
Currently, a linear constant current driving circuit is generally used for LED lighting, and as shown in fig. 1, a power supply V11, an LED device D11 and a current source I11 are sequentially connected in series to form a closed energy loop. The circuit is very simple, but requires the voltages of the power supply V11 and the LED device D11 to be as close as possible to obtain high efficiency, and the higher the turn-on threshold of the LED device D11, the higher the conversion efficiency of the circuit. On the other hand, if the turn-on threshold of the LED device D11 is high, when the power supply V11 fluctuates to a low voltage, the current flowing through the LED device D11 will drop greatly, even no current passes through, which makes the driving circuit unable to satisfy both a wide power supply voltage range and high efficiency, and is limited in application to an unstable power supply.
Disclosure of Invention
The invention aims to overcome the defects that a linear constant current driving circuit for LED illumination in the prior art cannot simultaneously meet the requirements of a wider power supply voltage range and high efficiency, and provides a chip driving circuit, a chip, a linear constant current driving circuit and a control method.
The invention solves the technical problems through the following technical scheme:
a kind of chip driving circuit is disclosed,
the circuit comprises a first current source, a second current source, a selector switch and a control circuit;
one end of the first current source and one end of the second current source are connected with one end of an external power supply after being connected with each other, and the other end of the first current source and the other end of the second current source are respectively connected with the outside; two ends of the change-over switch are respectively connected with the other end of the first current source and the other end of the external power supply;
the control circuit detects voltage and/or current parameters in the chip driving circuit and controls the on/off of the change-over switch and the on/off of the first current source;
when the change-over switch is switched on, the external load connected with the change-over switch in parallel is bypassed, and when the change-over switch is switched off, the external load connected with the change-over switch in parallel is switched on. The switch may be an electronic switch, the on and off of which is controlled by an external signal, and may be configured as one or more of a fet, a transistor, and other devices, for example, as described below.
Furthermore, the control circuit comprises a power supply voltage judging circuit, a timing circuit and a trigger circuit;
the power supply voltage judging circuit is used for detecting the voltage and/or the current in the chip driving circuit, judging the magnitude relation between the voltage at two ends of an external power supply and an external load conduction threshold, outputting a comparison signal according to a judgment result, inputting the comparison signal into the timing circuit, and controlling the conduction or the cut-off of the first current source;
and when the comparison signal is unchanged and the duration time reaches a preset timing threshold, the timing circuit changes the output level of the trigger circuit, and the output level of the trigger controls the on/off of the change-over switch. Furthermore, the power supply voltage judging circuit comprises a signal detection circuit, a first comparison circuit and a first preset signal reference;
the signal detection circuit detects one or more of the voltage at two ends of the power supply, the voltage at two ends of the first current source and the voltage at two ends of the second current source, and/or detects one or more currents flowing through the first current source and the second current source, and outputs a detection result, the detection result and the first preset signal reference are compared by a first comparison circuit and then output a comparison signal, and the comparison signal is input into the timing circuit;
the comparison signal is also used for controlling the on or off of the first current source; and when the detection result is greater than the first preset signal reference, the first current source is cut off, and when the detection result is less than the first preset signal reference, the first current source is switched on.
Furthermore, the timing circuit comprises a delay circuit, a first preset timing threshold, a second comparison circuit and a third comparison circuit; the comparison signal is input into the delay circuit;
when the detection result output by the signal detection circuit is smaller than the first preset signal reference, the delay circuit outputs a first time signal; when the first time signal reaches the first preset time threshold, the output end of the second comparison circuit controls the trigger circuit to conduct the change-over switch;
when the detection result output by the signal detection circuit is larger than the first preset signal reference, the delay circuit generates a second time signal; and when the second time signal reaches the second preset timing threshold, the output end of the third comparison circuit controls the trigger circuit to cut off the change-over switch.
Furthermore, the first comparison circuit includes a first comparator, the detection result output by the signal detection circuit is connected to an inverting terminal of the first comparator, the first preset signal reference is connected to an inverting terminal of the first comparator, and the output terminal of the first comparator outputs the comparison signal.
Furthermore, the delay circuit includes a first resistor and a first capacitor, one end of the first resistor is connected to the comparison signal, the other end of the first resistor is connected to one end of the first capacitor, the other end of the first capacitor is grounded, and the connection point of the first resistor and the first capacitor outputs the first time signal or the second time signal.
Furthermore, the trigger circuit comprises a trigger, an output end of the second comparison circuit is connected with a position end of the trigger, an output end of the third comparison circuit is connected with a reset end of the trigger, and an output end of the trigger is connected with the change-over switch and used for controlling the on/off of the change-over switch.
Furthermore, at least one component in the chip driving circuit is packaged in the chip, and the rest components are used as peripheral circuits to be connected with the chip.
A chip comprises the chip driving circuit.
A linear constant current drive circuit comprises the chip drive circuit, a power supply, a first load and a second load;
the power supply, the first load, the second load and the second current source are sequentially connected in series to form a closed loop;
the change-over switch is connected in parallel at two ends of the first load; one end of the first current source is connected to an intersection point of the first load and the second load, and the other end of the first current source is connected to an intersection point of the second current source and the power supply.
Furthermore, the power supply is a dc power supply or an ac rectified power supply, and the power supply further includes a third load connected in series with the dc power supply or the ac rectified power supply.
Furthermore, when the power supply voltage is greater than the sum of the turn-on threshold of the first load and the turn-on threshold of the second load, the switch and the first current source are both turned off; the change-over switch and the first current source are both cut off to form a third energy loop, and the energy circulation path of the third energy loop is as follows: the power supply → the first load → the second current source → the power supply, supplying energy to the first load and the second load.
When the power supply voltage is smaller than the sum of the conduction threshold of the first load and the conduction threshold of the second load and is larger than the larger value of the conduction threshold of the first load and the conduction threshold of the second load, the switch and the first current source are alternately switched between a first state and a second state, the first state is that the switch is turned off, the first current source is turned on, and a first energy loop is formed, wherein an energy circulation path of the first energy loop is as follows: the power supply → the first load → the first current source → the power supply, energizing the first load; the second state is that the change-over switch is turned on, the first current source is turned off, and a second energy loop is formed, wherein an energy circulation path of the second energy loop is as follows: the power supply → the changeover switch → the second load → the second current source → the power supply, supplying energy to the second load.
Furthermore, when the power supply voltage is smaller than the smaller of the conduction threshold of the first load and the conduction threshold of the second load, the switch and the first current source are both turned on to further form a fourth energy loop, and an energy circulation path of the fourth energy loop is as follows: the power supply → the diverter switch → the first current source → the power supply to draw energy from the power supply.
A control method of a linear constant current driving circuit is realized by using any one of the linear constant current driving circuits, and comprises the following steps:
judging the magnitude relation between the voltage at two ends of the power supply and the conduction thresholds of the first load and the second load;
controlling the on or off of the selector switch and the first current source according to the judgment result;
according to the different states of the change-over switch and the first current source, three different energy loops are formed, which are respectively:
the change-over switch is turned off, the first current source is turned on to form a first energy loop, and the energy circulation path of the first energy loop is as follows: the power supply → the first load → the first current source → the power supply, energizing the first load;
the change-over switch is turned on, the first current source is turned off to form a second energy loop, and the energy circulation path of the second energy loop is as follows: the power supply → the changeover switch → the second load → the second current source → the power supply, supplying energy to the second load;
the change-over switch and the first current source are both cut off to form a third energy loop, and the energy circulation path of the third energy loop is as follows: the power supply → the first load → the second current source → the power supply, supplying energy to the first load and the second load.
Furthermore, when the power supply voltage is greater than the sum of the turn-on threshold of the first load and the turn-on threshold of the second load, the switch and the first current source are both turned off;
when the power supply voltage is smaller than the sum of the conduction threshold of the first load and the conduction threshold of the second load and is larger than the larger value of the conduction threshold of the first load and the conduction threshold of the second load, the switch-off state and the first current source are alternately switched between a first state and a second state, the first state is that the switch-off state is adopted, the first current source is adopted, and the second state is that the switch-on state is adopted, and the first current source is adopted.
Furthermore, the switch and the first current source are both turned on to form a fourth energy loop, and an energy flow path of the fourth energy loop is as follows: the power supply → the diverter switch → the first current source → the power supply to draw energy from the power supply.
Furthermore, when the power supply voltage is smaller than the smaller value of the conduction threshold of the first load and the conduction threshold of the second load, the change-over switch and the first current source are both conducted.
A lighting device adopts the linear constant current driving circuit.
The implications of the foregoing concatenation, series, connection, linking, etc. are: including direct connection through a wire or indirect connection through another device without changing the function of the original structure, such as indirect connection through a resistor, which are used in the same meaning.
The load may be an LED, the LED includes one LED or a plurality of LEDs combined in series and parallel, and may also include a capacitor connected in parallel with the LED, the capacitor is used to filter current ripples of the LED, and when the LED is used, a blocking diode needs to be connected in series on a path where the capacitor discharges through the first current source or the second current source, as follows.
The positive progress effects of the invention are as follows: the magnitude relation between the power supply voltage and the conduction threshold of the load is obtained by detecting the current or voltage parameters in the linear constant current driving circuit, and the conduction or the cut-off of the current source and the change-over switch are automatically controlled to form different energy loops, so that stable and efficient power supply is provided for the load, the linear constant current driving circuit is wide in power supply voltage range, simple in circuit structure, low in cost, high in power supply efficiency and easy to widely apply.
Drawings
Fig. 1 is a circuit diagram of a prior art linear constant current driving circuit for load lighting.
Fig. 2 is a schematic circuit structure diagram of a linear constant current driving circuit according to embodiment 1 of the present invention.
Fig. 3 is a schematic circuit structure diagram of a linear constant current driving circuit according to embodiment 2 of the present invention.
Fig. 4 is a schematic circuit structure diagram of a linear constant current driving circuit according to embodiment 3 of the present invention.
Fig. 5 is a schematic circuit structure diagram of a linear constant current driving circuit according to embodiment 4 of the present invention.
Fig. 6 is a flowchart of a control method of a linear constant current driving circuit according to embodiment 5 of the present invention.
Description of reference numerals:
1. a control circuit; 2. a power supply voltage judgment circuit; 3. a timing circuit; 4. a trigger circuit; 31. a delay circuit.
Detailed Description
The present invention is further illustrated by the following examples, but the invention is not limited thereby within the scope of the examples described.
Example 1
The present embodiment provides a linear constant current driving circuit, a load is represented by using an LED, as shown in fig. 2, the linear constant current driving circuit includes a power supply V21, a first LED D21, a second LED D22, a first current source I21, a second current source I22, a switch SW21 and a control circuit 1, wherein the power supply V21, the first LED D21, the second LED D22 and the second current source I22 are sequentially connected in series to form a closed loop; the switch SW21 is connected in parallel across the first LED D21; one end of the first current source I21 is connected to the junction of the first LED D21 and the second LED D22, and the other end is connected to the junction of the second current source I22 and the power supply V21; the control circuit 1 is respectively connected to the switch SW21 and the first current source I21, and is used for controlling the switch SW21 and the first current source I21 to be turned on or off.
According to the state of the switch SW21 and the first current source I21, three different energy loops are formed, which are:
the switch SW21 is turned off, the first current source I21 is turned on to form a first energy loop, and the energy flow path of the first energy loop is: the power supply V21 → the first LED D21 → the first current source I21 → the power supply V21, which supplies power to the first LED D21;
the switch SW21 is turned on, the first current source I21 is turned off to form a second energy loop, and the energy flow path of the second energy loop is: the power supply V21 → the switch SW21 → the second LED D22 → the second current source I22 → the power supply V21, which supplies energy to the second LED D22;
the switch SW21 and the first current source I21 are both turned off to form a third energy loop, and the energy flow path of the third energy loop is: the power supply V21 → the first LED D21 → the second LED D22 → the second current source I22 → the power supply V21, which supplies power to the first LED D21 and the second LED D22.
In addition, the energy circulation system also comprises a fourth energy loop formed by the conduction of the switch SW21 and the first current source I21, and the energy circulation path of the fourth energy loop is as follows: the power supply V21 → the switch SW21 → the first current source I21 → the power supply V21 for drawing energy from the power supply V21.
The power supply V21 may be a dc power supply or an ac rectified power supply. The power supply V21 further comprises a third LED D23, the third LED D23 is connected in series with the output of the aforementioned DC power supply or AC rectified power supply, wherein the rectified output can be filtered or not filtered by a capacitive device, and the capacitive device is at least one capacitor
In this embodiment, when the voltage of the power supply V21 is greater than the sum of the turn-on thresholds of the first LED D21 and the second LED D22, the energy circulation path is a third energy loop, which provides energy for the first LED D21 and the second LED D22 at the same time, so as to obtain higher efficiency; when the voltage of the power supply source V21 is smaller than the sum of the conduction thresholds of the first LED D21 and the second LED D22 and larger than the larger value of the conduction threshold of the first LED D21 and the conduction threshold of the second LED D22, the energy circulation path is alternately a first energy loop and a second energy loop, and alternately supplies energy to the first LED D21 and the second LED D22, so that a wider power supply voltage range is allowed on the premise that all the LEDs can be lightened; when the voltage of the power supply V21 is less than the smaller of the turn-on threshold of the first LED D21 and the turn-on threshold of the second LED D22, the energy circulation path is a fourth energy loop to directly draw energy from the power supply V21, and the larger or smaller is not meant to be equal, and the first LED D21 and the second LED D22 may be configured to be identical, as follows, so that this embodiment can also be used in a power supply system with thyristor control, which is usually installed on a wall to control the brightness of a lighting device. Before the silicon controlled rectifier dimmer switches on, the leakage current is needed to trigger the silicon controlled rectifier to switch on, and the maintaining current is still needed to ensure the continuous conduction of the silicon controlled rectifier after the silicon controlled rectifier is triggered to switch on, so that the lighting device is needed to extract current from a power supply system within each power supply period for the longest current conduction time as possible, and the reliable triggering and the conduction of the silicon controlled rectifier are maintained. In the embodiment, when no current passes through the first energy loop, the second energy loop and the third energy loop, the fourth energy loop directly draws energy from the power supply source V21, and the current conduction time in each power supply period is extended, so that the power supply system with the thyristor control can be used.
The third LED D23 is connected in series to the dc power supply, and the switching thresholds of the first LED D21 and the second LED D22 are designed to be lower, so that the conversion efficiency of the present embodiment when operating in the first energy loop and the second energy loop can be improved. In the absence of the third LED D23, the efficiency rate of the first energy loop is approximately the turn-on threshold of the first LED D21 divided by the supply voltage; the efficiency rate of the second energy loop is approximately the turn-on threshold of the second LED D22 divided by the supply voltage; the efficiency of the third energy circuit is approximately the sum of the turn-on thresholds of the first LED D21 and the second LED D22 divided by the supply voltage, and it is expected that the efficiency of the first energy circuit and/or the second energy circuit will be lower than the efficiency of the third energy circuit when the supply voltage changes to cause the system to switch between the different energy circuits, especially when the system is just operating in a critical state of the third energy circuit and the first and/or second energy circuits. Examples are as follows: the sum of the conduction thresholds of the first LED D21 and the second LED D22 is 250V, the variation range of the power supply voltage is 240V-260V, and it can be calculated that the efficiency value of the third energy loop is high, the lowest value is 250/260 ≈ 96%, but the efficiency values of the first energy loop and the second energy loop are difficult to optimize, and no matter how the conduction thresholds of the first LED D21 and the second LED D22 are distributed, at least one of the efficiency values of the first energy loop and the second energy loop is lower than (250/2)/240 ≈ 52%.
If the third LED D23 is available, the efficiency value of the first energy loop is the sum of the conduction thresholds of the first LED D21 and the third LED D23 divided by the power supply voltage; the efficiency value of the second energy loop is the sum of the conduction thresholds of the second LED D22 and the third LED D23 divided by the power supply voltage; the efficiency value of the third energy circuit is the sum of the conduction thresholds of the first LED D21, the second LED D22 and the third LED D23 divided by the supply voltage, and it is also foreseen that the efficiency value of the first energy circuit and/or the second energy circuit is lower than the efficiency value of the third energy circuit when the supply voltage varies to cause the system to switch between different energy circuits, in particular when the system is just running in a critical state of the third energy circuit and the first and/or second energy circuit. However, because the third LED D23 is added, the turn-on thresholds of the first LED D21 and the second LED D22 can be designed to be lower, for example, as follows: the sum of the conduction thresholds of the first LED D21, the second LED D22 and the third LED D23 is 250V, the variation range of the power supply voltage is 240V-260V, the minimum value of the efficiency value of the third energy loop is still 250/260 ≈ 96%, but the efficiency values of the first energy loop and the second energy loop may be optimized, for example, the conduction threshold of the third LED D23 is set to 200V, the conduction thresholds of the first LED D21 and the second LED D22 are set to 50V, and the efficiency values of the first energy loop and the second energy loop are both greater than 200/240 ≈ 83% no matter how the conduction thresholds of the first LED D21 and the second LED D22 are distributed. The efficiency of the energy loop is improved as a whole by the above-mentioned manner. The specific above-mentioned driving circuit may be provided in a lighting device, such as an entire LED lamp.
Example 2
In this embodiment, a control circuit is detailed based on embodiment 1. As shown in fig. 3, the control circuit 1 includes a supply voltage judging circuit 2, a timing circuit 3, and a trigger circuit 4. Obviously, in practical applications, the corresponding control circuit may be integrated, the switch may also be integrated, or a part of them may be integrated, packaged as one or more chips, and connected with the corresponding peripheral LED and the power supply through pins to control the on or off of the corresponding channel, as required.
The power supply voltage judging circuit 2 detects one or more of voltages across a power supply source V21, namely, a detection point CS1 in fig. 3, a voltage across a first current source I21, namely, a detection point CS2 in fig. 3, and a voltage across a second current source I22, namely, a detection point CS3 in fig. 3, or detects a current flowing through one or more of a first current source I21, namely, a detection point CS4 in fig. 3, and a second current source I22, namely, a detection point CS5 in fig. 3, and is used for judging the magnitude relation between the voltage of the power supply source V21 and the conduction thresholds of the first LED D21 and the second LED D22; the supply voltage judging circuit 2 is also used for controlling the first current source I21 to be switched on or switched off. The timing circuit 3 and the trigger circuit 4 are used to control the on/off of the changeover switch SW21 according to the determination result of the power supply voltage determination circuit 2.
When the voltage of the power supply V21 is detected to be larger than the sum of the conduction thresholds of the first LED D21 and the second LED D22, the power supply voltage judgment circuit 2 controls the first current source I21 to be cut off, the timing circuit 3 and the trigger circuit 4 control the switch SW21 to be cut off, and the energy circulation path is a third energy loop; when the voltage of the power supply V21 is detected to be smaller than the sum of the conduction thresholds of the first LED D21 and the second LED D22 and larger than the larger value of the conduction threshold of the first LED D21 and the conduction threshold of the second LED D22, the energy circulation path is alternately a first energy loop and a second energy loop, and the alternation period can be set by a timing circuit. When the voltage of the power supply V21 is detected to be smaller than the smaller value of the conduction threshold of the first LED D21 and the conduction threshold of the second LED D22, the energy circulation path is a fourth energy loop and directly draws energy from the power supply V21, and preferably, the first LED D21 and the second LED D22 are set to the same specification.
Example 3
The supply voltage determining circuit 2, the timing circuit 3 and the trigger circuit 4 in the embodiment 2 can be implemented in many ways, but this embodiment is only one embodiment, and those skilled in the art should understand that there are many other implementation forms without departing from the scope of the present invention, and this embodiment further specifically refines the corresponding supply voltage determining circuit 2, the timing circuit 3 and the trigger circuit 4 in fig. 3, and simultaneously detects the electricity flowing through the second current source I22The operation process of the linear constant current driving circuit is specifically described by taking the flow as an example. As shown in fig. 4, the power supply voltage determining circuit 2 of the present embodiment includes a signal detecting circuit JC1, a first comparing circuit and a first predetermined signal reference VT1Here, the first comparator circuit is a first comparator a 1.
The signal detection circuit JC1 takes a value from the current of the second current source I22, outputs a detection result related to the current of the second current source I22 to the inverting terminal of the first comparator A1, and the first preset signal reference VT1Connected to the non-inverting terminal of the first comparator A1, a first predetermined signal reference VT1And the detection result is compared by a first comparator A1 to output a comparison signal, and the comparison signal is connected to the timing circuit 3. Meanwhile, the comparison signal is connected with the first current source I21 and is used for controlling the on or off of the first current source I21; when the detection result is larger than the first preset signal reference VT1When the comparison signal is smaller than the first preset signal reference V, the first current source is cut offT1The comparison signal turns on the first current source. The signal detection circuit JC1 can be implemented by using a resistor, or other methods can be used; the first current source and the second current source are only shown in the schematic diagrams in this embodiment, and in practical applications, the first current source and the second current source may be formed by a field effect transistor or a triode and a corresponding circuit, and those skilled in the art may implement the first current source and the second current source by using many well-known techniques.
The timing circuit 3 of the present embodiment includes a delay circuit 31, a first predetermined timing threshold VT2A second preset timing threshold VT3A second comparator circuit and a third comparator circuit. Here, the second comparator a2 is the second comparison circuit, and the third comparator A3 is the third comparison circuit. The comparison signal output by the supply voltage judging circuit 2 is connected to the input end of the delay circuit 31, the delay circuit 31 outputs a time signal and is connected with the inverting end of the second comparator A2 and the positive end of the third comparator A3, and the positive end of the second comparator A2 is connected with a first preset timing threshold VT2The inverting terminal of the third comparator A3 is connected to a second preset timing threshold VT3. The delay circuit 31 is composed of a first resistor R1 and a first capacitor C1, and one end of the first resistor R1 is the input end of the delay circuit 31The other end of the first resistor R1 is connected to one end of the first capacitor C1, which is the output terminal of the delay circuit 31, and the other end of the first capacitor C1 is grounded.
The flip-flop circuit 4 of this embodiment is a flip-flop TR1, the output terminal of the second comparator a2 is connected to the set terminal of the flip-flop TR1, the output terminal of the third comparator A3 is connected to the reset terminal of the flip-flop TR1, and the output terminal of the flip-flop TR1 is connected to the switch SW21, so as to control the on/off of the switch SW 21.
The switch receives the output signal of the trigger for control, and in practical application, the switch may be a triode or a field effect transistor and a corresponding peripheral circuit, and the configuration may be in a reasonable form, and the following also applies.
When the detection result is less than the first preset signal reference VT1At the amplitude of (3), the first comparator outputs a high level, the delay circuit 31 generates a first time signal reflecting the duration of the high level of the comparison signal, whereas the delay circuit 31 generates a second time signal reflecting the duration of the low level of the comparison signal;
the first time signal is compared with a preset first timing threshold VT2Compared with the second comparator A2, when the first time signal reaches the preset first timing threshold VT2When the second comparator a2 outputs a low level to the set terminal of the flip-flop TR1, the switch SW21 is turned on; the second time signal and a preset second timing threshold VT3Compared with the third comparator A3, when the second time signal reaches the preset second timing threshold VT3At this time, the third comparator a3 outputs a low level to the reset terminal of the flip-flop TR1, and the switch SW21 is turned off.
When the voltage across the power supply V21 is greater than the sum of the conduction thresholds of the first LED D21 and the second LED D22, the detection result output by the signal detection circuit JC1 is greater than the first preset signal reference VT1The first comparator a1 outputs low level, and the supply voltage judgment circuit 2 controls the first current source I21 to cut off; the delay circuit 31 generates a second time signal which is decreased to a second predetermined time threshold VT3At this time, the third comparator A3 outputs a low level, the flip-flop TR1 is reset, and the switch SW21 is controlledCutting off; the energy circulation path is a third energy loop for providing energy for the first LED D21 and the second LED D22 simultaneously, so as to obtain higher efficiency.
When the voltage of the power supply V21 is less than the sum of the conduction threshold of the first LED D21 and the conduction threshold of the second LED D22 and is greater than any one of the conduction threshold of the first LED D21 and the conduction threshold of the second LED D22, the detection result output by the signal detection circuit JC1 is less than the first preset signal reference VT1The first comparator a1 outputs high level, the supply voltage judging circuit 2 controls the first current source I21 to be turned on, and the energy flow path is a first energy loop; the delay circuit 31 outputs a first time signal which rises to a first predetermined time threshold VT2When the voltage is high, the second comparator A2 outputs low level, the trigger TR1 is set, and the switch SW21 is controlled to be switched on; when the first LED D21 is short-circuited and the current of the second current source I22 increases, the detection result output by the signal detection circuit JC1 is greater than the first preset signal reference VT1When the first comparator a1 outputs a low level, the supply voltage determination circuit 2 controls the first current source I21 to be cut off, and the energy flow path is switched to a second energy loop; at this time, the delay circuit 31 outputs a second time signal, and when the second time signal gradually falls to reach a second predetermined timing threshold VT3When the detection result output by the signal detection circuit JC1 is smaller than the first preset signal reference V againT1When the power supply voltage is not enough to drive the first LED D21 and the second LED D22 simultaneously, the two LEDs are lighted alternatively, and the normal work of the two LED devices in a wide voltage range is ensured.
When the voltage of the power supply V21 is smaller than the conduction threshold of the first LED D21 and the conduction threshold of the second LED D22, the detection result output by the signal detection circuit JC1 is always smaller than the first preset thresholdSetting signal reference VT1The first comparator a1 always outputs high level, the supply voltage judging circuit 2 controls the first current source I21 to be always on, and the second LED D22 is always short-circuited; the delay circuit 31 generates a first time signal which rises to a first predetermined time threshold VT2When the power supply is running, the second comparator a2 outputs a low level, the flip-flop TR1 is set, the switch SW21 is controlled to be turned on, the first LED D21 is always short-circuited, and the energy circulation path is a fourth energy loop for drawing energy from the power supply V21, so that the embodiment can also be used in a power supply system with thyristor control.
Example 4
As shown in fig. 5, the signal detection circuit JC1 connected to the inverting terminal of the first comparator a1 in embodiment 3 is removed and replaced with a circuit for directly detecting the voltage signal CS3 across the second current source I22 from the inverting terminal, and this voltage signal can also be used as a detection signal relating to the current of the second current source I22. The operation principle of embodiment 4 is the same as that of embodiment 3, and is not described again.
Example 5
The present embodiment provides a control method of a linear constant current driving circuit, as shown in fig. 6, the control method of the linear constant current driving circuit includes the following steps:
judging the magnitude relation between the voltage at two ends of the power supply and the conduction threshold of the first LED and the conduction threshold of the second LED;
controlling the switch and the first current source to be switched on or switched off according to the judgment result:
in the first case, when the voltage of the power supply is greater than the sum of the conduction threshold of the first LED and the conduction threshold of the second LED, the switch and the first current source are both cut off;
in the second situation, when the voltage of the power supply is smaller than the sum of the conduction threshold of the first LED and the conduction threshold of the second LED and is larger than any one of the conduction threshold of the first LED and the conduction threshold of the second LED, the switch is turned off and the first current source is alternately switched between a first state and a second state, wherein the first state is that the switch is turned off and the first current source is turned on, and the second state is that the switch is turned on and the first current source is turned off;
in a third case, when the power supply voltage is less than both the conduction threshold of the first LED and the conduction threshold of the second LED, both the switch and the first current source are turned on.
According to the different states of the switch and the first current source, three different energy supply loops are formed, which are respectively:
the switch is turned off, the first current source is turned on to form a first energy loop, and the energy circulation path of the first energy loop is as follows: power supply → first LED → first current source → power supply, for supplying energy to first LED;
the switch is turned on, the first current source is turned off to form a second energy loop, and the energy circulation path of the second energy loop is as follows: the power supply → the selector switch → the second LED → the second current source → the power supply, which supplies energy to the second LED;
the change-over switch and the first current source are both cut off to form a third energy loop, and the energy circulation path of the third energy loop is as follows: power supply → first LED → second current source → power supply, energizing the first and second LEDs.
The change-over switch and the first current source are both conducted to form a fourth energy loop, and the energy circulation path of the fourth energy loop is as follows: power supply → transfer switch → first current source → power supply, for drawing energy from power supply.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (14)

1. A chip driving circuit is characterized by comprising a first current source, a second current source, a change-over switch and a control circuit;
one end of the first current source and one end of the second current source are connected with one end of an external power supply after being connected with each other, and the other end of the first current source and the other end of the second current source are respectively connected with the outside; two ends of the change-over switch are respectively connected with the other end of the first current source and the other end of the external power supply;
the control circuit detects voltage and/or current parameters in the chip driving circuit and controls the on/off of the change-over switch and the on/off of the first current source;
when the change-over switch is switched on, the external load connected with the change-over switch in parallel is bypassed, and when the change-over switch is switched off, the external load connected with the change-over switch in parallel is switched on.
2. The chip driving circuit according to claim 1, wherein the control circuit comprises a supply voltage judging circuit, a timing circuit and a trigger circuit;
the power supply voltage judging circuit is used for detecting the voltage and/or the current in the chip driving circuit, judging the magnitude relation between the voltage at two ends of an external power supply and an external load conduction threshold, outputting a comparison signal according to a judgment result, inputting the comparison signal into the timing circuit, and controlling the conduction or the cut-off of the first current source;
and when the comparison signal is unchanged and the duration time reaches a preset timing threshold, the timing circuit changes the output level of the trigger circuit, and the output level of the trigger circuit controls the on/off of the change-over switch.
3. The chip driving circuit according to claim 2, wherein the supply voltage determining circuit comprises a signal detecting circuit, a first comparing circuit and a first preset signal reference;
the signal detection circuit detects one or more of a voltage across the power supply, a voltage across the first current source, and a voltage across the second current source,
and/or
Detecting one or more currents flowing through the first current source and the second current source, outputting a detection result, comparing the detection result with the first preset signal reference through a first comparison circuit, and outputting a comparison signal, wherein the comparison signal is input into the timing circuit;
the comparison signal is also used for controlling the on or off of the first current source; and when the detection result is greater than the first preset signal reference, the first current source is cut off, and when the detection result is less than the first preset signal reference, the first current source is switched on.
4. The chip driving circuit according to claim 3, wherein the timing circuit comprises a delay circuit, a first preset timing threshold, a second comparison circuit and a third comparison circuit; the comparison signal is input into the delay circuit;
when the detection result output by the signal detection circuit is smaller than the first preset signal reference, the delay circuit outputs a first time signal; when the first time signal reaches the first preset time threshold, the output end of the second comparison circuit controls the trigger circuit to conduct the change-over switch;
when the detection result output by the signal detection circuit is larger than the first preset signal reference, the delay circuit generates a second time signal; and when the second time signal reaches the second preset timing threshold, the output end of the third comparison circuit controls the trigger circuit to cut off the change-over switch.
5. The chip driving circuit according to claim 3, wherein the first comparator circuit comprises a first comparator, the detection result outputted from the signal detection circuit is connected to an inverting terminal of the first comparator, the first predetermined signal reference is connected to an inverting terminal of the first comparator, and an output terminal of the first comparator outputs the comparison signal.
6. The chip driving circuit according to claim 4, wherein the delay circuit comprises a first resistor and a first capacitor, one end of the first resistor is connected to the comparison signal, the other end of the first resistor is connected to one end of the first capacitor, the other end of the first capacitor is grounded, and a connection point of the first resistor and the first capacitor outputs the first time signal or the second time signal.
7. The chip driving circuit according to claim 4, wherein the trigger circuit comprises a flip-flop, an output terminal of the second comparing circuit is connected to a set terminal of the flip-flop, an output terminal of the third comparing circuit is connected to a reset terminal of the flip-flop, and an output terminal of the flip-flop is connected to the switch for controlling the on/off of the switch.
8. A chip driver circuit according to any of claims 1 to 7, wherein at least one of the components of the chip driver circuit is packaged in a chip and the remaining components are connected to the chip as peripheral circuitry.
9. A chip comprising the chip driving circuit according to any one of claims 1 to 7.
10. A linear constant current driving circuit, comprising the chip driving circuit or the chip of any one of claims 1 to 9, further comprising a power supply, a first load, and a second load;
the power supply, the first load, the second load and the second current source are sequentially connected in series to form a closed loop;
the change-over switch is connected in parallel at two ends of the first load; one end of the first current source is connected to an intersection point of the first load and the second load, and the other end of the first current source is connected to an intersection point of the second current source and the power supply.
11. The linear constant current driving circuit according to claim 10, wherein the power supply is a dc power supply or an ac rectified power supply, and the power supply further includes a third load connected in series with an output terminal of the dc power supply or the ac rectified power supply.
12. The linear constant current drive circuit according to claim 10 or 11,
when the power supply voltage is greater than the sum of the conduction threshold of the first load and the conduction threshold of the second load, the switch and the first current source are both cut off to form a third energy loop, and the energy circulation path of the third energy loop is as follows: the power supply → the first load → the second current source → the power supply, supplying energy to the first load and the second load;
when the power supply voltage is smaller than the sum of the conduction threshold of the first load and the conduction threshold of the second load and is larger than the larger value of the conduction threshold of the first load and the conduction threshold of the second load, the switch and the first current source are alternately switched between a first state and a second state, the first state is that the switch is turned off, the first current source is turned on, and a first energy loop is formed, wherein an energy circulation path of the first energy loop is as follows: the power supply → the first load → the first current source → the power supply, energizing the first load; the second state is that the change-over switch is turned on, the first current source is turned off, and a second energy loop is formed, wherein an energy circulation path of the second energy loop is as follows: the power supply → the changeover switch → the second load → the second current source → the power supply, supplying energy to the second load.
13. The linear constant current drive circuit according to claim 12,
when the power supply voltage is smaller than the smaller value of the conduction threshold of the first load and the conduction threshold of the second load, the change-over switch and the first current source are both switched on to form a fourth energy loop, and the energy circulation path of the fourth energy loop is as follows: the power supply → the diverter switch → the first current source → the power supply to draw energy from the power supply.
14. A lighting device, characterized in that the linear constant current driving circuit according to any one of claims 10 to 13 is used.
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