CN113597051B - Chip driving circuit, chip, linear constant current driving circuit and control method - Google Patents
Chip driving circuit, chip, linear constant current driving circuit and control method Download PDFInfo
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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]
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a chip driving circuit, a chip, a linear constant current driving circuit and a control method, and belongs to the field of load driving circuits. Aiming at the defect that a linear constant current driving circuit for load illumination in the prior art cannot simultaneously meet the wider power supply voltage range and high efficiency, the scheme provides a chip driving circuit, a chip, a linear constant current driving circuit and a control method. The power supply comprises a change-over switch, a first current source, a second current source and a control circuit, wherein the change-over switch and the first current source are controlled to be on or off according to the judging result by detecting signals which are in monotonous change relation with external power supply voltage in a chip driving circuit, judging the relation between the voltage at two ends of the power supply and the conduction voltage drop of the first load and the conduction voltage drop of the second load, so that different energy loops are formed, stable and efficient power supply is provided for load devices, the lighting effect of a lighting device is improved, and the power supply is easy to widely apply.
Description
The present application claims priority from chinese patent application CN201910493482.1, having application date 2019, 6.
The present application claims priority from chinese patent application CN201911106813.8, having a filing date of 2019, 11, 13.
The present application refers to the entirety of the above-mentioned chinese patent application.
Technical Field
The invention relates to the field of load driving circuits, in particular to a chip driving circuit, a chip, a linear constant current driving circuit and a control method.
Background
The current load illumination generally uses a linear constant current driving circuit, as shown in fig. 1, a power supply V11, a load 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 load device D11 to be as close as possible for high efficiency, the higher the conduction voltage drop of the load device D11, the higher the conversion efficiency of the circuit. However, if the on-voltage drop of the load device D11 is high, the current flowing through the load device D11 will drop substantially or even no current will pass when the power supply V11 fluctuates to a low voltage, which makes the driving circuit unable to satisfy a wide power supply voltage range and high efficiency at the same time, and the application is limited in the case of unstable power supply.
Disclosure of Invention
1. Technical problem to be solved
The invention aims to overcome the defect that a linear constant current driving circuit for load illumination in the prior art cannot meet the requirement of a wider power supply voltage range and high efficiency at the same time, and provides a chip driving circuit, a chip, a linear constant current driving circuit and a control method.
2. Technical proposal
The aim of the invention is achieved by the following technical scheme.
A chip driving circuit comprises a switch, a first current source, a second current source and a control circuit, wherein one end of the first current source, one end of the second current source and one end of the control circuit are grounded together; one end of the change-over switch is connected with the other end of the first current source, and the other end of the first current source, the other end of the second current source and the other end of the change-over switch are connected with corresponding loads; the other end of the first current source and the other end of the second current source are non-ground ends.
The control circuit detects a signal which is in monotonic change relation with the external power supply voltage in the chip driving circuit, judges the relation between the external power supply voltage and the conduction voltage drop of the external load, controls the conduction and cut-off states of the change-over switch and the first current source, specifically,
first case: when the external power supply voltage is larger than the sum of the conduction voltage drops of the external load, the change-over switch and the first current source are both cut off;
second case: when the external power supply voltage is smaller than the sum of the conduction voltage drops of the external load and is larger than a larger value of the conduction voltage drops of the external load, the change-over switch and the first current source are alternately switched between a first state and a second state, wherein the first state is that the change-over switch is turned off and the first current source is turned on; the second state is that the change-over switch is turned on and the first current source is turned off.
Preferably, the control circuit controls the current of the first current source and the second current source in the second case to be greater than the current of the second current source in the first case.
Further, the control circuit comprises a power supply voltage judging circuit, a timing circuit and a trigger circuit;
the power supply voltage judging circuit detects a signal which is in monotonous change relation with the external power supply voltage in the chip driving circuit, judges the magnitude relation between the external power supply voltage and the conduction voltage drop of the external load, generates a comparison signal, and controls the conduction and cut-off states of the first current source according to the comparison signal;
further, the timing circuit generates a time signal according to the comparison signal, and sets the duration time of the first state and the second state respectively;
further, the trigger circuit generates a driving signal suitable for controlling the switching switch to be switched on or off according to the time signal;
further, the control circuit detects a signal in the chip driving circuit in monotonically changing relation with the external power supply voltage, and controls the current of the second current source to decrease with the increase of the external power supply voltage under the first condition.
Further, at least one component of the chip driving circuit is packaged in the chip, and the rest components are connected with the chip as peripheral circuits.
A chip comprising one or more of any of the above chip driving circuits.
A linear constant current driving circuit comprises one or more of the chip driving circuits or chips, 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 with two ends of the first load; one end of the first current source is connected to the junction of the first load and the second load, and the other end of the first current source is connected to the junction of the second current source and the power supply.
Optimally, the power supply is a direct current power supply or an alternating current rectification filter power supply, and a third load is further contained in the power supply and is connected with the output end of the direct current power supply or the alternating current rectification power supply in series.
The control method of the linear constant current drive circuit is realized by utilizing any one of the linear constant current drive circuits, and comprises the following steps of:
detecting signals in the chip driving circuit, which have monotonic change relation with external power supply voltage, judging the relation between the voltages at two ends of the power supply and the conduction voltage drop of the first load and the conduction voltage drop of the second load, and controlling the switching switch and the first current source to be turned on or off according to the judging 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:
first case: when the power supply voltage is greater than the sum of the conduction voltage drop of the first load and the conduction voltage drop of the second load, the change-over switch and the first current source are both cut off to form a third energy loop, and an energy circulation path of the third energy loop is as follows: the power supply source→the first load→the second current source→the power supply source, and energy is supplied to the first load and the second load;
second case: when the power supply voltage is smaller than the sum of the conduction voltage drop of the first load and the conduction voltage drop of the second load and is larger than the larger value of the conduction voltage drop of the first load and the conduction voltage drop of the second load, the change-over switch and the first current source are controlled to be alternately switched between a first state and a second state;
the first state is that the change-over switch is turned off and the first current source is turned on, a first energy loop is formed, and an energy circulation path of the first energy loop is as follows: the power supply source- & gt the first load- & gt the first current source- & gt the power supply source supplies energy for 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;
the energy flow path of the second energy loop is as follows: the power supply source→the switching switch→the second load→the second current source→the power supply source, and the second load is supplied with energy.
Optimally, the current of the second current source is controlled to decrease with the increase of the external power supply voltage in the first case,
and/or the number of the groups of groups,
the current of the first current source and the current of the second current source in the second case are controlled to be larger than the current of the second current source in the first case.
A lighting device employing the linear constant current driving circuit of any one of the above, the load comprising one LED or a plurality of LEDs combined in series-parallel.
The foregoing larger or smaller value does not indicate that the first load and the second load are necessarily different, and when they are the same, either one of them may be selected to be the larger or smaller value, and the same is true hereinafter.
In addition, in practical applications, it is difficult to have "equal to" in the strict mathematical sense, and unless otherwise specified, "greater than" or "less than" in the present application includes "equal to" as well, and "equal to" or "the same" merely indicates that there is no substantial difference between the specified objects, and is not to be regarded as "equal" in the strict mathematical sense.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
the voltage at two ends of the power supply is judged by detecting the signal which is in monotone change relation with the external power supply voltage in the chip driving circuit, the relation between the voltage at two ends of the power supply and the conduction voltage drop of the first load and the conduction voltage drop of the second load are judged, and the switch and the first current source are controlled to be turned on or off according to the judging result, so that different energy loops are formed, stable and efficient power supply is provided for load devices, the power supply is applicable, the power supply voltage range is wide, the power supply efficiency is high, the lighting effect of the lighting device is improved, and the lighting device is easy to widely apply.
Drawings
FIG. 1 is a diagram of a prior art linear constant current drive circuit for load illumination;
FIG. 2 is a schematic diagram of a chip driving circuit and a linear constant current driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a chip driving circuit and a linear constant current driving circuit according to an embodiment of the present invention.
Description of the drawings
1. A chip driving circuit; 2. a power supply voltage judgment circuit; 3. a timing circuit; 4. a trigger circuit; 7. a power supply; 8. and a control circuit.
Detailed Description
The invention will now be described in detail with reference to the drawings and the accompanying specific examples.
The present embodiment provides a chip driving circuit and a linear constant current driving circuit, as shown in fig. 2,
the chip driving circuit 1 comprises a switch SW1, a first current source I21, a second current source I22 and a control circuit 8, wherein the first current source I21, the second current source I22 and the control circuit 8 are connected and share one ground; one end of the change-over switch SW21 is connected with the non-ground end of the first current source I21, the non-ground end of the second current source I22 and the other end of the change-over switch SW21 are connected with loads D21 and D22; the control circuit 8 detects a signal in the chip driving circuit 1 in monotonic change relation with the voltage of the power supply V21, judges the relation between the voltage of the power supply V21 and the on-off voltage drop of the loads D21 and D22, controls the on-off state of the changeover switch SW21 and the first current source I21, specifically,
first case: when the voltage of the power supply V21 is larger than the sum of the conduction voltage drops of the loads D21 and D22, the change-over switch SW21 and the first current source I21 are both turned off;
second case: when the voltage of the power supply V21 is smaller than the sum of the conduction voltage drops of the loads D21 and D22 and is larger than the larger value of the conduction voltage drops of the loads D21 and D22, the change-over switch SW21 and the first current source I21 are alternately switched between a first state and a second state, wherein the first state is that the change-over switch SW21 is turned off and the first current source I21 is turned on; the second state is that the change-over switch SW21 is turned on and the first current source I21 is turned off.
The control circuit 8 controls the currents of the first current source I21 and the second current source I22 in the second case to be larger than the current of the second current source I22 in the first case;
the control circuit 8 includes a supply voltage judgment circuit 2, a timing circuit 3, and a trigger circuit 4;
the power supply voltage judging circuit 2 detects a signal which is in monotonous change relation with the voltage of the power supply V21 in the chip driving circuit 1, judges the magnitude relation between the voltage of the power supply V21 and the conduction voltage drops of the loads D21 and D22, generates a comparison signal, and controls the conduction and cut-off states of the first current source I21 according to the comparison signal;
the timing circuit 3 generates a time signal according to the comparison signal, and sets the duration time of the first state and the second state respectively;
the trigger circuit 4 generates a drive signal suitable for controlling the switching switch SW21 to be turned on or off according to the time signal;
in practical application, at least one component of the chip driving circuit 1 is packaged in a chip, the rest of the components are connected with the chip as peripheral circuits, for example, most of devices for realizing the control circuit 8, the first current source I21 and the second current source I22 are packaged in one chip, the change-over switch uses external discrete devices as peripheral circuits to be connected with the chip so as to realize the whole function, of course, components which do not need to be changed when the chip driving circuit is applied in the whole chip driving circuit can be integrated in one chip, and the peripheral circuits only comprise a small number of components for setting voltage/current in the chip, such as one or a plurality of resistors, and specific implementation schemes are configured according to requirements.
The linear constant current driving circuit comprises a chip driving circuit 1, a power supply V21, a first load D21 and a second load D22, wherein the power supply V21, the first load I21, the second load I22 and the second current source I22 are sequentially connected in series to form a closed loop.
The change-over switch SW21 is connected in parallel to two ends of the first load D21; one end of the first current source I21 is connected to the junction of the first load D21 and the second load 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 connected to the switch SW21 and the first current source I21, and controls the switch SW21 and the first current source I21 to be turned on or off.
According to the different states of the change-over switch SW21 and the first current source I21, three different energy loops are formed, respectively:
first case: when the voltage of the power supply V21 is greater than the sum of the on voltage drop of the first load D21 and the on voltage drop of the second load D22, the switch SW21 and the first current source I21 are both turned off to form a third energy loop, and the energy circulation path of the third energy loop is as follows: the power supply V21- & gt first load D21- & gt second load D22- & gt second current source I22- & gt power supply V21 supplies energy for the first load D21 and the second load D22.
Second case: when the voltage of the power supply V21 is smaller than the sum of the conduction voltage drop of the first load D21 and the conduction voltage drop of the second load D22 and is larger than the larger value of the conduction voltage drop of the first load D21 and the conduction voltage drop of the second load D22, the switch SW21 and the first current source I21 are controlled to be alternately switched between a first state and a second state, wherein the first state is that the switch SW21 is turned off, the first current source I21 is turned on, a first energy loop is formed, and the energy flow path of the first energy loop is as follows: the power supply V21- & gt the first load D21- & gt the first current source I21- & gt the power supply V21 supplies energy for the first load D21; the second state is that the change-over switch SW21 is turned on, the first current source I21 is turned off, a second energy loop is formed, and an energy flow path of the second energy loop is: the power supply V21, the change-over switch SW21, the second load D22, the second current source I22 and the power supply V21 are used for providing energy for the second load D22;
in the embodiment, when the voltage of the power supply V21 is greater than the sum of the conduction voltage drops of the first load D21 and the second load D22, the energy circulation path is a third energy loop, and energy is provided for both the first load D21 and the second load D22, so that higher efficiency is obtained; when the voltage of the power supply V21 is smaller than the sum of the conduction voltage drops of the first load D21 and the second load D22 and is larger than the larger value of the conduction voltage drops of the first load D21 and the second load D22, the energy circulation path is alternately a first energy loop and a second energy loop, and the first load D21 and the second load D22 are alternately supplied with energy, so that a wider power supply voltage range is allowed on the premise that all loads can be lightened.
In addition, the chip driving circuit is arranged in the second condition, and the current of the first current source I21 and the second current source I22 is larger than the current of the second current source I22 in the first condition, so that when the power supply voltage V21 is different, the total power of the first load D21 and the second load D22 is approximately equal, and an approximately unchanged load effect is realized; and detecting a signal in the chip driving circuit 1 in monotonic change relation with the voltage of the external power supply V21, controlling the current of the second current source I22 to decrease with the increase of the voltage of the external power supply V21 in the first case, that is, decreasing the input and output currents of the power supply V21 when the power supply V21 increases, and vice versa, so that the total power of the whole linear constant current driving circuit is approximately unchanged.
The foregoing monotonic change relationship includes a positive monotonic change and/or an inverse monotonic change, the positive monotonic change being that when the independent variable increases, the dependent variable increases therewith, or when the independent variable decreases therewith; anti-monotonic change refers to a decrease in the dependent variable as the independent variable increases, or an increase in the dependent variable as the independent variable decreases. For example, the dependent variable is configured as a linear function of the independent variable. The same is true of the following.
Specific implementations of the invention are described below in more detail, but the invention is not limited to the described implementations, as those skilled in the art will appreciate that there are numerous other implementations that do not depart from the scope of the invention.
As in fig. 3, the implementation details of the components are further refined on the basis of fig. 2, wherein,
the supply voltage judging circuit 2 is composed of a comparator A1 and a signal reference VT1, wherein the voltage signal of the drain electrode of the field effect tube Q2 is detected by the inverting terminal of the comparator A1, and the voltage signal is directly detected, or can be indirectly detected by other circuits, such as a resistor voltage dividing network, when the voltage of the inverting terminal is larger than the voltage of the non-inverting terminal, namely the voltage of the signal reference VT1, the comparator A1 outputs a low level, the switch SW2 is turned off, otherwise, a high level is output, and the switch SW2 is turned on;
the timing circuit is composed of a resistor RT and a capacitor CT, when the comparator A1 outputs a high level, the delay circuit composed of R1 and C1 generates a rising time signal at two ends of C1, otherwise generates a falling time signal, and other devices can be used for charging and discharging the capacitor CT in practical application, for example, a current source composed of a plurality of transistors or field effect transistors, and other technologies, particularly in an integrated circuit, the delay circuit composed of smaller capacitors and resistors can be used for corresponding processing after the delay circuit composed of smaller time constants.
The trigger circuit 4 is composed of a comparator A2, a comparator A3, a signal reference VT2, a signal reference VT3, a trigger TR1, a field effect transistor Q4 and a resistor RL, when the rising time signal reaches the threshold of the signal reference VT2, the comparator A2 outputs a low level, the QB end of the trigger TR1 outputs a low level, the field effect transistor Q4 is turned off, the Q output high level, the switch SW3 is turned on, when the falling time signal reaches the threshold of the signal reference VT3, the comparator A3 outputs a low level, the QB end of the trigger TR1 outputs a high level, the field effect transistor Q4 is turned on, the Q output of the trigger TR1 is low level, the switch SW3 is turned off, the Q4 and the RL convert the output level of the trigger TR1 into a driving signal suitable for driving the switch SW21, the signal is a current signal, the RL is limited in a reasonable range, and the current signal formed by the comparator and the trigger is limited in a logic circuit or the logic circuit formed by the Q4 and the RL.
The switch SW21 is composed of a field effect transistor Q3, a resistor RP3 and a voltage regulator tube ZD1, when the field effect transistor Q4 is turned on, the Q3 is turned off, that is, the switch SW21 is turned off, where the voltage regulator tube ZD1 protects the gate and the source of the field effect transistor from damage, otherwise, when the field effect transistor Q4 is turned off, the resistors RP3, ZD1 generate driving voltages on the gate and the source of the Q3, and when the Q3 is turned on, that is, the switch SW21 is turned on, the logic corresponding to the on-off of the switch and the on-off of the Q4 is inverted, which can still achieve the same function.
The first current source I21 is composed of a switch SW2, a resistor RP1, an amplifier EA1, a resistor RCS, a signal reference V35 and a field effect transistor Q1, when the switch SW2 is turned on, the current value is set to be V35/RCS, and when the switch SW2 is turned off, the resistor RP1 grounds the same phase terminal of the amplifier EA1, the current value is set to be zero, namely, the first current source I21 is turned off; the first current source I21 is controlled to be turned on or off by controlling the signal at the same phase end of the amplifier EA1, or may be controlled by other means, for example, by connecting the gate of the switch Q1 to ground, turning off the switch Q1 when turned on, and turning on the switch off time Q1.
The second current source I22 is composed of a signal reference V35, a signal reference V36, a switch SW3, a resistor RP2, a resistor R2, an amplifier EA2, a resistor RCS and a field effect transistor Q2, wherein the signal reference V35 is larger than the signal reference V36, the amplifier EA2 has two in-phase terminals, the high potential is preferred, when the switch SW3 is turned on, the current value is set to V35/RCS, when the switch SW3 is turned off, the current value is configured to V36/RCS, the current mode of configuring the second current source I22 is realized by switching the in-phase terminal signal of the amplifier EA2, and other modes such as switching the resistance value of RCS can be adopted.
The switch SW4, the resistor R1, the resistor R2, the comparator A4 and the signal reference VT4 configure that the current of the second current source I22 decreases with the increase of the supply voltage, wherein VT4 is smaller than VT3, in the first case, the output of the comparator A1 is continuously at a low level, the voltage on the timing capacitor C1 is lower than the signal reference VT4, the comparator A4 controls the switch SW4 to be turned on, the resistor R1 and the resistor R2 introduce a signal in monotonically changing relation with the supply voltage signal to the inverting terminal of the amplifier EA2, and the current of the control fet Q2 decreases with the increase of the supply voltage, where the resistor R1 detects that the switch is close to one end of the supply voltage, in practical application, different circuit node signals, such as the drain electrode of Q1 or Q2, that is, the non-ground terminal of the first or the second current source, and even other node signals, such as related node signals reflecting the load current, can be selected as well.
The aforementioned field effect transistor may also be configured as a transistor or a combination of a transistor and a field effect transistor.
The power supply 7 is configured to: the ac power source is rectified by the rectifier DB1 and then output, the output end is connected in parallel with the filter capacitor C1 to reduce the current ripple of the load, and of course, when the current ripple of the load is not considered, the capacitor C1 can be omitted, and the output end is also connected in series with the third load D23 to optimize the efficiency, and the principle of optimizing the efficiency is illustrated as follows:
in the absence of the third load D23, the efficiency value of the first energy loop is about the on-voltage drop of the first load D21 divided by the output voltage; the efficiency value of the second energy loop is about the conduction voltage drop of the second load D22 divided by the output voltage; the efficiency value of the third energy loop is approximately the sum of the conduction voltage drops of the first load D21 and the second load D22 divided by the output voltage, and it is envisioned that the efficiency value of the first energy loop and/or the second energy loop is lower than the efficiency value of the third energy loop when the output voltage changes to cause the system to switch between different energy loops, especially when the system is just operating in the critical state of the third energy loop and the first and/or the second energy loop. Examples are as follows: the sum of the conduction voltage drops of the first load D21 and the second load D22 is 250V, the output voltage variation range is 240V-260V, and it can be calculated that the efficiency value of the third energy loop is higher, the minimum value is 250/260 about 96%, but the efficiency values of the first energy loop and the second energy loop are difficult to optimize, and at least one of the efficiency values of the first energy loop and the second energy loop is lower than (250/2)/240 about 52% no matter how the conduction voltage drops of the first load D21 and the second load D22 are distributed.
If the third load D23 exists, the efficiency value of the first energy loop is the sum of the conduction voltage drops of the first load D21 and the third load D23 divided by the output voltage; the efficiency value of the second energy loop is the sum of the conduction voltage drops of the second load D22 and the third load D23 divided by the output voltage; it is also conceivable that the efficiency value of the third energy circuit is the sum of the conduction voltage drops of the first load D21, the second load D22 and the third load D23 divided by the output voltage, and 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 output voltage changes to cause the system to switch between different energy circuits, especially when the system is just operating in a critical state of the third energy circuit and the first and/or the second energy circuit. However, because of the addition of the third load D23, the on-state voltage drop of the first load D21 and the second load D22 can be designed to be low, for example, as follows: the sum of the conduction voltage drops of the first load D21, the second load D22 and the third load D23 is 250V, the output voltage ranges from 240V to 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 can be optimized, for example, the conduction voltage drop of the third load D23 is set to 200V, the conduction voltage drop of the first load D21 and the second load D22 is set to 50V, and the efficiency values of the first energy loop and the second energy loop are all larger than 200/240≡83%, no matter how the conduction voltage drops of the first load D21 and the second load D22 are distributed. The efficiency of energy conversion is improved as a whole in the above manner.
The load comprises one load or a plurality of loads combined in series-parallel, and the load is preferably an LED.
Example 2
The embodiment provides a control method of a linear constant current driving circuit, which comprises the following steps:
detecting signals in the chip driving circuit, which have monotonic change relation with external power supply voltage, judging the relation between the voltages at two ends of the power supply and the conduction voltage drop of the first load and the conduction voltage drop of the second load, and controlling the switching switch and the first current source to be turned on or off according to the judging 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:
first case: when the power supply voltage is greater than the sum of the conduction voltage drop of the first load and the conduction voltage drop of the second load, the change-over switch and the first current source are both cut off to form a third energy loop, and an energy circulation path of the third energy loop is as follows: the power supply source→the first load→the second current source→the power supply source, and energy is supplied to the first load and the second load;
second case: when the power supply voltage is smaller than the sum of the conduction voltage drop of the first load and the conduction voltage drop of the second load and is larger than the larger value of the conduction voltage drop of the first load and the conduction voltage drop of the second load, the change-over switch and the first current source are controlled to be alternately switched between a first state and a second state, the first state is that the change-over switch is turned off, the first current source is turned on, a first energy loop is formed, and an energy circulation path of the first energy loop is as follows: the power supply source- & gt the first load- & gt the first current source- & gt the power supply source supplies energy for the first load; the second state is that the change-over switch is turned on, the first current source is turned off, a second energy loop is formed, and an energy circulation path of the second energy loop is as follows: the power supply source→the switching switch→the second load→the second current source→the power supply source, and the second load is supplied with energy.
Further, the current of the second current source is controlled to decrease with increasing external supply voltage in the first case, and/or,
the control circuit controls the currents of the first current source and the second current source so that the currents of the first current source and the second current source in the second case are both larger than the current of the second current source in the first case.
According to the embodiment, the signal in the chip driving circuit, which is in a monotonic change relation with the external power supply voltage, is detected to judge the relation between the voltage at two ends of the power supply and the conduction voltage drop of the first load and the conduction voltage drop of the second load, and the switch and the first current source are controlled to be conducted or cut off according to the judging result, so that different energy loops are formed.
The foregoing has been described schematically the invention and embodiments thereof, which are not limiting, but are capable of other specific forms of implementing the invention without departing from its spirit or essential characteristics. The drawings are also intended to depict only one embodiment of the invention, and therefore the actual construction is not intended to limit the claims, any reference number in the claims not being intended to limit the claims. Therefore, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical scheme are not creatively designed without departing from the gist of the present invention, and all the structural manners and the embodiment are considered to be within the protection scope of the present patent. In addition, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the inclusion of a plurality of such elements. The various elements recited in the product claims may also be embodied in software or hardware. The terms first, second, etc. are used to denote a name, but not any particular order.
Claims (10)
1. A chip driving circuit, characterized in that: the switching device comprises a change-over switch, a first current source, a second current source and a control circuit, wherein one end of the first current source, one end of the second current source and one end of the control circuit are grounded together; one end of the change-over switch is connected with the other end of the first current source, the other end of the second current source and the other end of the change-over switch are connected with corresponding external loads, and the change-over switch is connected in parallel with two ends of the corresponding external loads;
the external power supply, the external load and the second current source are sequentially connected in series to form a closed loop; the external power supply voltage is an alternating current rectification power supply, and the output end of the alternating current rectification power supply is connected with a capacitor for filtering;
the control circuit detects a signal which is in monotonic change relation with the external power supply voltage in the chip driving circuit, judges the relation between the external power supply voltage and the conduction voltage drop of the external load, controls the on-off state of the change-over switch and the first current source, and the state condition is specifically that,
first case: when the external power supply voltage is larger than the sum of the conduction voltage drops of the external load, the change-over switch and the first current source are both cut off;
second case: when the external power supply voltage is smaller than the sum of the conduction voltage drops of the two external loads and is larger than a larger value of the conduction voltage drops of the two external loads, the change-over switch and the first current source are alternately switched between a first state and a second state, wherein the first state is that the change-over switch is turned off and the first current source is turned on; the second state is that the change-over switch is turned on and the first current source is turned off.
2. The chip driving circuit according to claim 1, wherein the control circuit includes a supply voltage judgment circuit, a timing circuit, and a trigger circuit;
the power supply voltage judging circuit detects a signal which is in monotonous change relation with the external power supply voltage in the chip driving circuit, judges the magnitude relation between the external power supply voltage and the conduction voltage drop of the external load, generates a comparison signal, and controls the conduction and cut-off states of the first current source according to the comparison signal;
the timing circuit generates a time signal according to the comparison signal, and respectively sets the duration time of the first state and the second state; the trigger circuit generates a driving signal suitable for controlling the switching switch to be switched on or off according to the time signal.
3. The chip driving circuit according to claim 1, wherein the control circuit controls the current of the second current source to decrease with an increase in the external power supply voltage in the first case,
and/or the number of the groups of groups,
the current of the first current source and the current of the second current source in the second case are controlled to be larger than the current of the second current source in the first case.
4. A chip driving circuit according to any one of claims 1-3, wherein at least one component of the chip driving circuit is packaged in a chip, and the remaining components are connected to the chip as peripheral circuits.
5. A chip comprising a chip driving circuit as claimed in any one of claims 1 to 3.
6. A linear constant current driving circuit, which is characterized by comprising the chip driving circuit or the chip according to any one of claims 1-5, and 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 with two ends of the first load; one end of the first current source is connected to the junction of the first load and the second load, and the other end of the first current source is connected to the junction of the second current source and the power supply.
7. The linear constant current driving circuit according to claim 6, wherein the power supply is an ac rectified power supply, and the power supply further comprises a third load, and the third load is connected in series with an output terminal of the ac rectified power supply.
8. A control method based on the linear constant current drive circuit according to claim 7, comprising the steps of:
detecting signals in the chip driving circuit, which have monotonic change relation with external power supply voltage, judging the relation between the voltages at two ends of the power supply and the conduction voltage drop of the first load and the conduction voltage drop of the second load, and controlling the switching switch and the first current source to be turned on or off according to the judging result;
first case: when the power supply voltage is greater than the sum of the conduction voltage drop of the first load and the conduction voltage drop of the second load, the change-over switch and the first current source are both cut off to form a third energy loop, and an energy circulation path of the third energy loop is as follows: the power supply source→the first load→the second current source→the power supply source, and energy is supplied to the first load and the second load;
second case: when the power supply voltage is smaller than the sum of the conduction voltage drop of the first load and the conduction voltage drop of the second load and is larger than the larger value of the conduction voltage drop of the first load and the conduction voltage drop of the second load, the change-over switch and the first current source are controlled to be alternately switched between a first state and a second state;
the first state is that the change-over switch is turned off and the first current source is turned on, a first energy loop is formed, and an energy circulation path of the first energy loop is as follows: the power supply source- & gt the first load- & gt the first current source- & gt the power supply source supplies energy for 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;
the energy flow path of the second energy loop is as follows: the power supply source→the switching switch→the second load→the second current source→the power supply source, and the second load is supplied with energy.
9. The method for controlling a linear constant current driving circuit according to claim 8, wherein,
the current controlling the second current source in the first case decreases with increasing external supply voltage, and/or,
the current of the first current source and the current of the second current source in the second case are controlled to be larger than the current of the second current source in the first case.
10. A lighting device employing the linear constant current drive circuit of any one of claims 6-7, wherein the external load comprises one LED or a plurality of LEDs combined in series-parallel.
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| CN201921971113.0U Active CN211557553U (en) | 2019-06-06 | 2019-11-13 | Chip driving circuit, chip, linear constant current driving circuit and lighting device |
| CN202010515251.9A Active CN113597051B (en) | 2019-06-06 | 2020-06-08 | Chip driving circuit, chip, linear constant current driving circuit and control method |
| CN202010514795.3A Pending CN113597049A (en) | 2019-06-06 | 2020-06-08 | Chip driving circuit, chip, linear constant current driving circuit and control method |
| CN202021041139.8U Active CN213186632U (en) | 2019-06-06 | 2020-06-08 | Chip driving circuit, chip, linear constant current driving circuit and lighting device |
| CN202021041138.3U Active CN213186631U (en) | 2019-06-06 | 2020-06-08 | Chip driving circuit, chip, linear constant current driving circuit and lighting device |
| CN202010515256.1A Active CN113597052B (en) | 2019-06-06 | 2020-06-08 | Chip driving circuit, chip, linear constant current driving circuit and control method |
| CN202021039312.0U Active CN212588554U (en) | 2019-06-06 | 2020-06-08 | Chip driving circuit, chip, linear constant current driving circuit and lighting device |
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| CN212588554U (en) | 2021-02-23 |
| CN113597049A (en) | 2021-11-02 |
| CN213186631U (en) | 2021-05-11 |
| CN211557552U (en) | 2020-09-22 |
| CN113597051A (en) | 2021-11-02 |
| CN211557553U (en) | 2020-09-22 |
| CN213186632U (en) | 2021-05-11 |
| CN113597052A (en) | 2021-11-02 |
| CN113597052B (en) | 2024-03-22 |
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