CN113597049A - 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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- CN113597049A CN113597049A CN202010514795.3A CN202010514795A CN113597049A CN 113597049 A CN113597049 A CN 113597049A CN 202010514795 A CN202010514795 A CN 202010514795A CN 113597049 A CN113597049 A CN 113597049A
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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 defects that the linear constant current driving circuit for load illumination in the prior art cannot simultaneously meet the requirements of a 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 device comprises a change-over switch, a first current source, a second current source and a control circuit, wherein the relation between the voltage at two ends of a power supply and the conducting voltage drop of a first load and the conducting voltage drop of a second load is judged by detecting a signal which is in a monotonous change relation with the external power supply voltage in a chip driving circuit, and the change-over switch and the first current source are controlled to be switched on or switched off according to a judgment result to form different energy loops, so that stable and efficient power supply is provided for a load device, the lighting effect of the lighting device is improved, and the power supply device is easy to widely apply.
Description
The present application claims priority from chinese patent application CN201910493482.1 filed 2019, 6/6.
The present application claims priority from chinese patent application CN201911106790.0 filed on 2019, 11/13/h.
The present application refers to the above-mentioned chinese patent application in its entirety.
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 lighting 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 connected in series in sequence 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 to obtain high efficiency, and the higher the conduction voltage drop of the load device D11, the higher the conversion efficiency of the circuit. On the other hand, if the conduction voltage drop of the load device D11 is high, when the power supply V11 fluctuates to a low voltage, the current flowing through the load 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
1. Technical problem to be solved
The invention aims to overcome the defects that a linear constant current driving circuit for load 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.
2. Technical scheme
The purpose of the invention is realized by the following technical scheme.
A chip driving circuit comprises 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; the other end of the first current source and the other end of the second current source 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 connected load is specifically that the other end of the first current source is connected with a first load, the second current source is connected with a second load,
the control circuit detects a signal which is in a monotone change relation with an 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 state of the first current source, and particularly,
in the first case: when the external power supply voltage is greater than the sum of the conduction voltage drops of the external load, the first current source is cut off;
in the second case: when the external power supply voltage is less than the sum of the conduction voltage drops of the external load, the first current source is conducted.
Preferably, the control circuit detects a signal in the chip driving circuit which is in a monotone change relationship with the voltage of the external power supply, and controls the current of the second current source to decrease with the increase of the voltage of the external power supply in the first case.
Optimally, at least one part in the chip driving circuit is packaged in the chip, and the rest parts are used as peripheral circuits to be connected with the chip.
A chip comprising the chip driving circuit of any one of the above.
A linear constant current driving circuit comprises the chip driving circuit or the chip, 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;
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.
The power supply is a direct current power supply or an alternating current rectification filter power supply.
A control method based on the linear constant current driving circuit comprises the following steps:
the control circuit detects a signal which is in a monotone change relation with an external power supply voltage in the chip driving circuit, judges the magnitude 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 controls the conduction or the cut-off of the first current source according to the judgment result;
according to different states of the first current source, two different energy loops are formed, wherein the two different energy loops are respectively as follows:
in the 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 first current source is cut off to form a second energy loop, and the energy circulation path of the second 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;
in the 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, controlling the first current source to be conducted to form a first energy loop, wherein 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, supplying energy to the first load.
Further, the current of the second current source is controlled to decrease with the increase of the voltage of the external power supply in the first case,
and/or the presence of a gas in the gas,
the current of the first current source in the second case is controlled to be larger than the current of the second current source in the first case.
A lighting device adopts the linear constant current driving circuit, and the load comprises one LED or a plurality of LEDs combined in series and parallel.
In practice, it is difficult to have "equal" in the strict mathematical sense, and "greater than" or "less than" in the present application includes "equal" unless otherwise specified, and similarly, "equal to" or "the same" merely means that there is no substantial difference between the objects to be described, and it is not regarded as "equal" in the strict mathematical sense.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
the method comprises the steps of judging the relationship 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 by detecting a signal which is in a monotonous change relationship with the external power supply voltage in a chip driving circuit, controlling the conduction or the cut-off of the first current source according to a judgment result to form different energy loops, providing stable and efficient power supply for a load device, adapting to wide range of power supply voltage and high power efficiency, and improving the lighting effect of the LED lighting device when the load is an LED.
Drawings
Fig. 1 is a circuit diagram of a prior art linear constant current driving circuit for load lighting.
Fig. 2 is a schematic structural 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 circuit schematic diagram of a chip driving circuit and a linear constant current driving circuit according to an embodiment of the present invention.
The reference numbers in the figures illustrate:
1. a chip driving circuit; 2. a power supply voltage judgment circuit; 7. a power supply; 8. a control circuit.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples.
Example 1
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 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 share one ground; the non-ground terminal of the first current source I21 and the non-ground terminal of the second current source I22 are connected with loads D21 and D22; the control circuit 8 detects a signal which is in a monotone change relation with the voltage of the power supply V21 in the chip driving circuit 1, here, the non-ground end of the second current source I22, judges the relation between the voltage of the power supply V21 and the on-off voltage drops of the loads D21 and D22, controls the on-off state of the first current source I21, specifically,
in the first case: when the voltage of the power supply V21 is greater than the sum of the conduction voltage drops of the loads D21 and D22, the first current source I21 is cut off;
in the second case: when the voltage of the power supply V21 is less than the sum of the conduction voltage drops of the loads D21 and D22, the first current source I21 is conducted;
the control circuit 8 controls the current of the first current source I21 to be larger in the second case than the current of the second current source I22 in the first case;
here, the control circuit 8 is the supply voltage judging circuit 2;
the power supply voltage judging circuit 2 detects a signal which is in a monotone change relation with the voltage of the power supply V21 in the chip driving circuit 1, wherein the signal is at the non-ground end of the second current source I22, judges the magnitude relation between the voltage of the power supply V21 and the conduction voltage drop of the loads D21 and D22, generates a comparison signal, and controls the conduction and cut-off state of the first current source I21 according to the comparison signal;
in practical application, at least one component in the chip driving circuit 1 is packaged in a chip, and the rest of the components are connected to the chip as peripheral circuits, for example, all the components for implementing the control circuit 8, the first current source I21 and the second current source I22 are packaged in one chip to implement the whole function.
The linear constant current driving circuit comprises a power supply V21, a first load D21 and a second load D22 besides the chip driving circuit 1, wherein the power supply V21, the first load I21, the second load I22 and a second current source I22 are sequentially connected in series to form a closed loop,
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.
Depending on the state of the first current source I21, two different energy loops are formed, respectively:
in the first case: when the voltage of the power supply V21 is greater than the sum of the turn-on voltage drop of the first load D21 and the turn-on voltage drop of the second load D22, the first current source I21 is turned off to form a second energy loop, and the energy circulation path of the second energy loop is: the power supply V21 → the first load D21 → the second load D22 → the second current source I22 → the power supply V21, which supplies energy to the first load D21 and the second load D22;
in the second case: when the voltage of the power supply V21 is less than the sum of the conduction voltage drop of the first load D21 and the conduction voltage drop of the second load D22, the first current source I21 is controlled to be turned on to form a first energy loop, and the energy circulation path of the first energy loop is: the power supply V21 → the first load D21 → the first current source I21 → the power supply V21, which supplies energy to the first load D21;
in this 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 second energy loop, which provides energy to the first load D21 and the second load D22 at the same time, so as to obtain higher efficiency; when the voltage of the power supply V21 is less than the sum of the conduction voltage drops of the first load D21 and the second load D22, the energy flow path is the first energy loop to supply energy to the first load D21, so that the load can allow a wider power supply voltage range.
And the chip driving circuit sets the current of the first current source I21 in the second case to be larger than the current of the second current source I22 in the first case, so that when the supply voltages V21 are different, the total power variation of the first load D21 and the second load D22 is small, and under the two conditions, the input power change of the power supply is small, in the specific application, the total power of the load can be optimally configured according to the requirement, or, the input power of the power supply is optimally configured, and a signal which is in a monotone change relationship with the voltage of the external power supply V21 in the chip driving circuit 1 is also configured to control the current of the second current source I22 to decrease along with the increase of the voltage of the external power supply V21 under the first condition, i.e., as the supply voltage V21 increases, the input and output currents of the supply voltage V21 decrease, therefore, when the voltage of the power supply fluctuates, the input power of the linear constant current driving circuit changes slightly.
The monotonic variation relationship includes positive monotonic variation and/or negative monotonic variation, where positive monotonic variation means that the dependent variable increases when the independent variable increases, or decreases when the independent variable decreases; an inverse monotonic change means that the dependent variable decreases as the independent variable increases or increases as the independent variable decreases. For example, the dependent variable is configured as a linear function of the independent variable. The same is true below.
Specific implementations of the invention are described below in more detail in terms of circuitry, but the invention is not limited thereby to the described implementations, and those skilled in the art will recognize that there are many other implementations that do not depart from the scope of the invention.
The implementation details of the components are further refined on the basis of fig. 2, as shown in fig. 3, wherein,
the power supply voltage judging circuit 2 is composed of a comparator A1 and a signal reference VT1, the inverting terminal of the comparator A1 detects the voltage signal of the drain of the field effect transistor Q2, and the voltage signal is directly detected here, or indirectly detected by other circuits, such as a resistance voltage division 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 low level, the switch SW2 is cut off, otherwise, high level is output, and the switch SW2 is turned on; for specific applications, the inverting terminal of the comparator a1 may also detect any other signal that has a monotonically varying relationship with the power supply, such as detecting the voltage at the non-ground terminal of the first current source, or detecting the current of the second current source, among others.
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, and when the switch SW2 is turned on, its current value is set to V35/RCS, and when the switch SW2 is turned off, the resistor RP1 connects the non-inverting terminal of the amplifier EA1 to ground, its current value is set to zero, that is, the first current source is turned off; the first current source is controlled to be turned on or off by controlling the non-inverting terminal signal of the amplifier EA1, but other methods are also possible, such as connecting the gate of the Q1 to ground through a switch, turning off the Q1 when the switch is turned on, and turning on the switch-off time Q1.
The second current source I22 is composed of a signal reference V36, a resistor R1, a resistor R2, an amplifier EA2, a resistor RCS and a field effect transistor Q2, and the current value of the second current source is configured to be V36/RCS;
wherein the signal reference V36 is smaller than the signal reference V35 to set the current of the second current source in the first case to be smaller than the current of the first current source in the second case, where the setting of the currents of the first current source I21 and the second current source I22 is achieved by the difference of the signal references at the non-inverting terminals of the amplifier, and may also be achieved in other ways, such as by changing the signal at the inverting terminal of the amplifier, and the circuit may vary in many ways, including many variations, without departing from the scope of the invention.
The resistor R1 and the resistor R2 configure that the current of the second current source I22 decreases with the increase of the supply voltage, and this function occurs in the first case, and in the second case, the first current source bypasses the second current source and the electrical branch where the second load is located, here, the resistor R1 detects the non-ground terminal of the second current source, and in practical applications, different circuit node signals can be selected according to requirements, such as selecting the non-ground terminal of the first current source, the output terminal of an external power supply, and the like.
The aforementioned fet may also be configured as a triode or a combination of a triode and a fet.
The power supply 7 is configured to: the ac power is rectified by the rectifier DB1 and then output, and the output terminal is connected in parallel with the filter capacitor C1 to reduce the current ripple of the load, and of course, the capacitor C1 may be omitted when the current ripple of the load is not considered.
The load comprises one load or a plurality of loads combined in series and 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 a signal which is in a monotonous change relation with an external power supply voltage in a chip driving circuit, judging the magnitude 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 controlling the on-off of the change-over switch and the first current source according to a judgment result;
according to different states of the first current source, two different energy loops are formed, wherein the two different energy loops are respectively as follows:
in the 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 first current source is cut off to form a second energy loop, and the energy circulation path of the second 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;
in the 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, controlling the first current source to be conducted to form a first energy loop, wherein 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, supplying energy to the first load.
Further, the current of the second current source is controlled to decrease with the increase of the voltage of the external power supply in the first case,
and/or the presence of a gas in the gas,
the current of the first current source in the second case is controlled to be larger than the current of the second current source in the first case.
In the above embodiment, the current of the first current source in the second case is controlled to be larger than the current of the second current source in the first case, so that the input power of the power supply source with smaller variation or the constant total power of the load can be obtained, when the preferred total power of the load is constant, when the load is an LED, the constant or smaller-variation total light emitting quantity of the LED can be obtained by configuration according to the light emitting characteristics of the LED, so that the illumination device based on the embodiment has the advantages of stable brightness and low stroboflash; controlling the current of the second current source in the first case to decrease with an increase in the voltage of the external power supply can reduce the variation in the input power when the power supply fluctuates.
The invention and its embodiments have been described above schematically, without limitation, and the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The representation in the drawings is only one of the embodiments of the invention, the actual construction is not limited thereto, and any reference signs in the claims shall not limit the claims concerned. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent. Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (9)
1. A chip driving circuit, comprising: the power supply comprises 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; the other end of the first current source and the other end of the second current source are connected with corresponding loads; the control circuit detection chip is used for driving a signal which is in a monotone change relationship with an external power supply voltage in the circuit, judging the relationship between the external power supply voltage and the conduction voltage drop of the external load, and controlling the on-off state of the first current source, wherein the state condition is specifically,
in the first case: when the external power supply voltage is greater than the sum of the conduction voltage drops of the external load, the first current source is cut off;
in the second case: when the external power supply voltage is less than the sum of the conduction voltage drops of the external load, the first current source is conducted.
2. A chip driver circuit according to claim 1, wherein the control circuit controls the current of the second current source to decrease in the first case as the voltage of the external power supply increases.
3. A chip driving circuit according to any one of claims 1-2, wherein at least one component of the chip driving circuit is packaged in the chip, and the remaining components are connected to the chip as peripheral circuits.
4. A chip comprising the chip driving circuit according to any one of claims 1 to 2.
5. A linear constant current driving circuit, which is characterized by comprising the chip driving circuit or the chip of any one of claims 1 to 4, 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;
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.
6. The linear constant current drive circuit according to claim 5, wherein the power supply is a DC power supply or an AC rectified and filtered power supply.
7. A control method based on the linear constant current drive circuit of any one of claims 5 to 6, comprising the following steps:
the control circuit detects a signal which is in a monotone change relation with an external power supply voltage in the chip driving circuit, judges the magnitude 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 controls the conduction or the cut-off of the first current source according to the judgment result;
according to different states of the first current source, two different energy loops are formed, wherein the two different energy loops are respectively as follows:
in the 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 first current source is cut off to form a second energy loop, and the energy circulation path of the second 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;
in the 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, controlling the first current source to be conducted to form a first energy loop, wherein 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, supplying energy to the first load.
8. The control method of a linear constant current drive circuit according to claim 7,
controlling the current of said second current source to decrease with increasing external power supply voltage in the first case,
and/or the presence of a gas in the gas,
the current of the first current source in the second case is controlled to be larger than the current of the second current source in the first case.
9. A lighting device, wherein the linear constant current driving circuit according to any one of claims 5 to 6 is adopted, and the load comprises one LED or a plurality of LEDs combined in series and parallel.
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| CN2019104934821 | 2019-06-06 | ||
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| CN201921963673.1U Active CN211557552U (en) | 2019-06-06 | 2019-11-13 | Chip driving circuit, chip, linear constant current driving circuit and lighting device |
| CN202010514795.3A Pending CN113597049A (en) | 2019-06-06 | 2020-06-08 | Chip driving circuit, chip, linear constant current driving circuit and control method |
| CN202010515251.9A Active CN113597051B (en) | 2019-06-06 | 2020-06-08 | Chip driving circuit, chip, linear constant current driving circuit and control method |
| CN202010515256.1A Active CN113597052B (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 |
| 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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Also Published As
| Publication number | Publication date |
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| CN113597051B (en) | 2024-02-09 |
| CN113597052A (en) | 2021-11-02 |
| CN113597052B (en) | 2024-03-22 |
| CN211557553U (en) | 2020-09-22 |
| CN211557552U (en) | 2020-09-22 |
| CN212588554U (en) | 2021-02-23 |
| CN213186631U (en) | 2021-05-11 |
| CN213186632U (en) | 2021-05-11 |
| CN113597051A (en) | 2021-11-02 |
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