CN211429598U - Drive circuit and electronic product - Google Patents
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- CN211429598U CN211429598U CN202020311806.3U CN202020311806U CN211429598U CN 211429598 U CN211429598 U CN 211429598U CN 202020311806 U CN202020311806 U CN 202020311806U CN 211429598 U CN211429598 U CN 211429598U
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Abstract
The embodiment of the application provides a drive circuit and an electronic product, and the drive circuit comprises: a power supply circuit that supplies a direct-current voltage; the constant current source circuit is connected with the power supply circuit, receives the direct current voltage output by the power supply circuit and outputs constant current, the constant current is output to an electrical appliance circuit, and the electrical appliance circuit comprises at least two electrical appliances connected in series; the number of the switching elements is at least one, each switching element is connected with each electrical appliance in parallel, a control end of each switching element receives a first control signal, and the first control signal controls the switching elements to be switched on or switched off; and at least one amplifying circuit, wherein each amplifying circuit is coupled between the control end of each switching element and a predetermined voltage end, and the input end of each amplifying circuit receives a second control signal and amplifies the second control signal to obtain the first control signal.
Description
Technical Field
The present disclosure relates to circuit technologies, and in particular, to a driving circuit and an electronic product.
Background
The driving circuit can provide voltage or current for the electrical appliance, thereby ensuring the normal work of the electrical appliance. The electrical device is, for example, a Light Emitting Diode (LED) or the like.
Fig. 1 is a schematic diagram of a prior art LED driving circuit, in which a switching element TR1 is connected in series with an LED1 between a predetermined voltage VCC and a ground terminal, and a control signal CTL1 is input to a base of TR1 through a resistor R3, as shown in fig. 1. Fig. 1 also includes a resistor R2 and a resistor R1. The resistors R1 and R3 are current limiting resistors, and R2 is a pull-up resistor.
As shown in fig. 1, when the control signal CTL1 is at a high level, TR1 is turned on, current flows through the LED1, and the LED1 is turned on, and when the control signal CTL1 is at a low level, TR1 is turned off, no current flows through the LED1, and the LED1 is turned off. The factor determining the brightness of the LED1 is the current I _ LED flowing through the LED1, where I _ LED is (VCC-VF _ LED)/R1, and VF _ LED is the on-state voltage drop of the LED 1.
When a plurality of LEDs need to be controlled individually, a plurality of LEDs need to be provided in fig. 1, such as R1, R2, R3, and TR 1.
It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.
SUMMERY OF THE UTILITY MODEL
The inventors of the present application have found that the structure of the drive circuit shown in fig. 1 is simple, but has the following problems: on one hand, when a plurality of LEDs are independently controlled, because the load of the LEDs is changed when the LEDs are turned on and off, the power supply load is changed, the output power supply precision of the power supply is influenced, and particularly, when the voltage exceeds the specification, the peripheral circuit is influenced; on the other hand, when a plurality of LEDs are independently controlled, because the LEDs are connected in parallel, the circulating currents of the LEDs are determined by respective loops, and because the conduction voltage drops VF of different LEDs may have deviations, the R1 current-limiting resistors may also have deviations, and the like, the conduction currents I _ LEDs of different LEDs may be different, that is, the consistency of the conduction currents I _ LEDs is poor, so that the light-emitting luminances of different LEDs are easily different, and the visibility is affected; in addition, the problem of poor uniformity of the on-current also exists in circuits in which LEDs are replaced with other electrical appliances.
In order to solve the above problems or similar problems, embodiments of the present application provide a driving circuit and an electronic product, where the driving circuit adopts a constant current source structure to provide driving currents for serially connected electrical appliances, so that the conduction currents of each electrical appliance are the same, and the change in the number of electrical appliances does not affect the change in load, so that the power supply load is constant; in addition, the second control signal is amplified by the amplifying circuit and then used as the first control signal of the switching element, so that high voltage can be controlled at low voltage, and the speed of turning on or off the electrical appliance is increased.
According to an aspect of an embodiment of the present application, there is provided a driving circuit including:
a power supply circuit that supplies a direct-current voltage;
the constant current source circuit is connected with the power supply circuit, receives the direct current voltage output by the power supply circuit and outputs constant current, the constant current is output to an electrical appliance circuit, and the electrical appliance circuit comprises at least two electrical appliances connected in series;
the number of the switching elements is at least one, each switching element is connected with each electrical appliance in parallel, a control end of each switching element receives a first control signal, and the first control signal controls the switching elements to be switched on or switched off; and
the number of the amplifying circuits is at least one, each amplifying circuit is coupled between the control end of each switching element and a preset voltage end, and the input end of each amplifying circuit receives a second control signal and amplifies the second control signal to obtain the first control signal.
According to another aspect of the embodiments of the present application, wherein the driving circuit further comprises:
a virtual load circuit comprising at least one resistor, the virtual load circuit connected in series with the consumer circuit.
According to another aspect of an embodiment of the present application, wherein,
the virtual load circuit is connected at a position farther from the constant current source circuit than the consumer circuit.
According to another aspect of an embodiment of the present application, wherein,
the power supply circuit includes:
a filter circuit that performs a filtering process on an input ac voltage;
the rectifying circuit is connected with the filter circuit and is used for rectifying the voltage output by the filter circuit to obtain a first direct-current voltage; and
the transformation circuit is coupled with the rectifying circuit and used for converting the first direct-current voltage into the direct-current voltage and outputting the direct-current voltage.
According to another aspect of the embodiments of the present application, the driving circuit further includes:
a controller coupled to an input of each of the amplifying circuits, for outputting the second control signal to the input of the amplifying circuit.
According to another aspect of the embodiments of the present application, the switching element is a PNP transistor or an NPN transistor; the amplifying circuit is provided with an NPN triode or a PNP triode.
According to another aspect of the embodiments of the present application, there is provided an electronic product including the driving circuit of any one of the above-mentioned embodiments.
According to another aspect of the embodiments of the present application, wherein the electronic product is a time relay, a timer, a counter, or a temperature controller.
The beneficial effects of the embodiment of the application are that: the driving circuit adopts a constant current source structure and provides driving current for the series-connected electric appliances, so that the conduction current of each electric appliance is the same, and the change of the number of the electric appliances does not influence the change of the load, so that the load of the power supply is constant; in addition, the second control signal is amplified by the amplifying circuit and then used as the first control signal of the switching element, so that high voltage can be controlled at low voltage, and the speed of turning on or off the electrical appliance is increased.
Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
The feature information described and illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with or instead of the feature information in the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
Many aspects of the disclosure can be better understood with reference to the following drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application. For convenience in illustration and description, corresponding parts in the drawings may be exaggerated or minimized in order to facilitate illustration and description of some portions of the present application. Elements and feature information described in one drawing or one embodiment of the present application may be combined with elements and feature information shown in one or more other drawings or embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts for use in more than one embodiment.
In the drawings:
FIG. 1 is a schematic diagram of a prior art LED driving circuit;
fig. 2 is a schematic diagram of a driving circuit of embodiment 1 of the present application;
fig. 3 is another schematic diagram of a driving circuit of embodiment 1 of the present application;
fig. 4 is a schematic structural diagram of a power supply circuit according to embodiment 1 of the present application.
Detailed Description
Preferred embodiments of the present application will be described below with reference to the accompanying drawings.
Example 1
The embodiment of the application provides a driving circuit. Fig. 2 is a schematic diagram of a driving circuit according to embodiment 1 of the present application. As shown in fig. 2, the driving circuit 200 includes: a power supply circuit 1, a constant current source circuit 2, switching elements TR118 to TR120, and an amplification circuit 4.
As shown in fig. 2, the power supply circuit 1 supplies a direct-current voltage; the constant current source circuit 2 is connected with the power supply circuit, receives the direct current voltage output by the power supply circuit 1, and outputs a constant current, the constant current is output to the electrical appliance circuit 5, and the electrical appliance circuit 5 comprises at least two electrical appliances D112-D114 connected in series; the number of the switching elements is at least one, such as TR 118-TR 120, each switching element is connected with each electrical appliance D112-D114 in parallel, the control end of each switching element TR 118-TR 120 receives a first control signal, and the first control signal controls the switching elements TR 118-TR 120 to be switched on or off; the number of the amplifying circuits 4 is at least one, each amplifying circuit 4 is coupled between the control terminal of each switching element TR118 to TR120 and a predetermined voltage terminal, which may be, for example, the ground terminal GND _ a, or a power supply terminal, etc., and the input terminal of each amplifying circuit 4 receives the second control signals CTL1 to CTL3 and amplifies the second control signals to obtain the first control signals.
According to the embodiment 1, the driving circuit adopts a constant current source structure and provides driving current for the series-connected electric appliances, so that the conduction current of each electric appliance is the same, and the change of the number of the electric appliances does not influence the change of the load, so that the load of the power supply is constant; in addition, the second control signal is amplified by the amplifying circuit and then used as the first control signal of the switching element, so that the high voltage can be controlled at low voltage, and the on-off speed of the electric appliance is increased; in addition, each electrical appliance in the electrical appliances connected in series can be independently controlled by the switching element, so that the electrical appliances cannot be influenced with each other.
In the present embodiment, the electrical appliance may be a Light Emitting Diode (LED) or the like. In the following description of the present embodiment, the electrical appliance is an LED, and the description is also applicable to the case where the electrical appliance is another component.
As shown in fig. 2, the number of serial consumers D112 to D114 is three, but the embodiment is not limited thereto, and the number may be two, or more than three.
As shown in fig. 2, the constant current source circuit 2 may have: the transistors TR114 and TR115, and the resistors R183 and R184. The transistors TR114, TR115 may be PNP transistors. As shown in fig. 2, the emitter of the transistor TR114 is connected to the power supply circuit 1, and receives a dc voltage VCC; the emitter of the transistor TR115 is coupled to the power supply circuit 1 through the resistor R183, and receives the dc voltage VCC; the base electrode of the triode TR114 is connected with the emitting electrode of the triode TR 115; the collector of the transistor TR114 is coupled to the ground GND _ a through a resistor R184; electrical devices D112 to D114 are connected in series between the collector of the transistor TR115 and the ground GND _ a.
As shown in fig. 2, the switching elements TR118 to TR120 may be PNP transistors, NPN transistors, Metal Oxide Semiconductor (MOS) transistors, or the like. The amplifier circuit 4 has NPN transistors, and the TR124 to TR126 may be replaced with PNP transistors.
For example, a collector and an emitter of switching element TR120 are connected to a cathode and an anode of consumer D114, respectively, a base of switching element TR120 is coupled to a collector of NPN transistor TR126 of amplifier circuit 4 through resistor R189, an emitter of NPN transistor TR126 is connected to ground GND _ a, a base of NPN transistor TR126 receives second control signal CTL3, and a resistor may be connected between the base and the emitter of NPN transistor TR 126.
In addition, the driving circuit 200 may further include resistors R193 to R195, for example, the resistor R195 may be coupled between an input terminal (not shown) of the second control signal CTL3 and the voltage terminal VDD1, whereby the NPN transistor TR126 can receive a voltage from the voltage terminal VDD1 to perform an amplification process of amplifying the second control signal CTL3 into the first control signal.
In addition, as shown in fig. 2, the driving circuit 200 may further include a controller 6, wherein the controller 6 is coupled to the input terminal of each of the amplifying circuits 4, and outputs second control signals CTL1 to CTL3 to the input terminal of the amplifying circuit 4.
Next, the operation of drive circuit 200 will be described by taking the driving of consumer D112 as an example.
The second control signal CTL1 is a high-level or low-level control signal from the controller 6, and when CTL1 is at a high level, the transistor TR124 is turned on, the base potential of the transistor TR118 is pulled low, so that the transistor TR118 is turned on, and the current I _ LED of the constant current source circuit 2 flows through the transistor TR118, that is, the transistor TR118 short-circuits the consumer D112, and thus the consumer D112 is turned off, for example, the LED is turned off; when CTL1 is at a low level, transistor TR124 is turned off, the base potential of transistor TR118 is not pulled low, and transistor TR118 is turned off, and current I _ LED of constant current source circuit 2 flows through consumer D112, whereby consumer D112 is turned on, for example, the LED is lit. The current I _ LED is determined by the constant current source circuit 2, and therefore, the current I _ LED remains unchanged regardless of whether the consumer D112 is turned on, so that the load of the drive circuit 200 is constant.
As shown in fig. 2, the driving circuit 200 may further have a dummy load circuit 7, and the dummy load circuit 7 may include at least one resistor R113, so that when all the consumers D113 to D115 are turned off, the dummy load circuit 7 may bear loop load and share power loss of the transistor TR 115.
As shown in fig. 2, the dummy load circuit 7 may be connected at a position farther from the constant current source circuit 2 than the consumer circuit 5, for example, the resistor R113 is farther from the transistor TR115 than the consumer D112. Therefore, when all the electrical appliances D113-D115 are turned off, the virtual load circuit 7 can provide a reference voltage, so that all the electrical appliances D113-D115 can work in the off state.
Fig. 3 is another schematic diagram of the driving circuit of the present embodiment. The driving circuit 200a of fig. 3 is similar in structure to the driving circuit of fig. 1, except that in fig. 2, the transistors TR114, TR115, TR118, TR119, and TR120 are all PNP transistors, and in fig. 3, the transistors TR114, TR115, TR118, TR119, and TR120 are all NPN transistors.
Fig. 4 is a schematic diagram of a configuration of the power supply circuit of the present embodiment. As shown in fig. 4, the power supply circuit 1 includes: a filter circuit 11, a rectifier circuit 12 and a transformer circuit 13.
The filter circuit 11 performs filtering processing on the input ac voltage, for example, the filter circuit 11 may include an inductor and/or a capacitor; the rectifying circuit 12 is connected to the filter circuit 11, and rectifies the voltage output by the filter circuit 11 to obtain a first direct-current voltage, for example, the rectifying circuit 12 may be a bridge rectifier; the transforming circuit 13 is coupled to the rectifying circuit 12 for converting the first direct-current voltage into a direct-current voltage and outputting the direct-current voltage, for example, the transforming circuit 13 may be a DC-DC converter or the like.
In the present embodiment, the power supply circuit 1 may have other elements. As to the specific circuit structure and the operation principle of the power circuit 1, reference may be made to the prior art, and the embodiment of the present application will not be described.
According to the embodiment 1, the driving circuit adopts a constant current source structure and provides driving current for the series-connected electric appliances, so that the conduction current of each electric appliance is the same, and the change of the number of the electric appliances does not influence the change of the load, so that the load of the power supply is constant; in addition, the second control signal is amplified by the amplifying circuit and then used as the first control signal of the switching element, so that the high voltage can be controlled at low voltage, and the on-off speed of the electric appliance is increased; in addition, each electrical appliance in the electrical appliances connected in series can be independently controlled by the switching element, so that the electrical appliances cannot be influenced with each other.
Example 2
In this embodiment, the electronic product may be: a time relay, a timer, a counter, or a temperature controller.
In the electronic product of the present embodiment, the driving circuit 200 or 200a may be used to drive the consumers D112, D113, D114, etc. in the consumer circuit 5. For example, the controller 6 in the driving circuit 200 or 200a may output the second control signals (CTL 1-CTL 3) according to the key status, the count value, the timing result, the temperature setting value, or the like in the electronic product to control the corresponding light emitting diodes as the electrical appliances to be turned on, so that the information such as the key status, the count value, the timing result, the temperature setting value, or the like in the electronic product can be reflected by the lighting status of the light emitting diodes.
According to embodiment 2, a driving circuit in an electronic product adopts a constant current source structure to provide driving current for serially connected electrical appliances, so that the conduction current of each electrical appliance is the same, and the change of the number of the electrical appliances does not influence the change of the load, so that the load of a power supply is constant; in addition, the second control signal is amplified by the amplifying circuit and then used as the first control signal of the switching element, so that the high voltage can be controlled at low voltage, and the on-off speed of the electric appliance is increased; in addition, each electrical appliance in the electrical appliances connected in series can be independently controlled by the switching element, so that the electrical appliances cannot be influenced with each other.
The present application has been described in conjunction with specific embodiments, but it should be understood by those skilled in the art that these descriptions are intended to be illustrative, and not limiting. Various modifications and adaptations of the present application may occur to those skilled in the art based on the spirit and principles of the application and are within the scope of the application.
Claims (8)
1. A driver circuit, characterized in that the driver circuit comprises:
a power supply circuit that supplies a direct-current voltage;
the constant current source circuit is connected with the power supply circuit, receives the direct current voltage output by the power supply circuit and outputs constant current, the constant current is output to an electrical appliance circuit, and the electrical appliance circuit comprises at least two electrical appliances connected in series;
the number of the switching elements is at least one, each switching element is connected with each electrical appliance in parallel, a control end of each switching element receives a first control signal, and the first control signal controls the switching elements to be switched on or switched off; and
the number of the amplifying circuits is at least one, each amplifying circuit is coupled between the control end of each switching element and a preset voltage end, and the input end of each amplifying circuit receives a second control signal and amplifies the second control signal to obtain the first control signal.
2. The drive circuit of claim 1, wherein the drive circuit further comprises:
a virtual load circuit comprising at least one resistor, the virtual load circuit connected in series with the consumer circuit.
3. The drive circuit of claim 2,
the virtual load circuit is connected at a position farther from the constant current source circuit than the consumer circuit.
4. The drive circuit of claim 1,
the power supply circuit includes:
a filter circuit that performs a filtering process on an input ac voltage;
the rectifying circuit is connected with the filter circuit and is used for rectifying the voltage output by the filter circuit to obtain a first direct-current voltage; and
the transformation circuit is coupled with the rectifying circuit and used for converting the first direct-current voltage into the direct-current voltage and outputting the direct-current voltage.
5. The drive circuit of claim 1, wherein the drive circuit further comprises:
a controller coupled to an input of each of the amplifying circuits, for outputting the second control signal to the input of the amplifying circuit.
6. The drive circuit of claim 1,
the switch element is a PNP triode or an NPN triode;
the amplifying circuit is provided with an NPN triode or a PNP triode.
7. An electronic product, characterized in that the electronic product comprises the driving circuit of any one of claims 1 to 6.
8. The electronic product of claim 7,
the electronic product is a time relay, a timer, a counter or a temperature controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020311806.3U CN211429598U (en) | 2020-03-13 | 2020-03-13 | Drive circuit and electronic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020311806.3U CN211429598U (en) | 2020-03-13 | 2020-03-13 | Drive circuit and electronic product |
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| CN211429598U true CN211429598U (en) | 2020-09-04 |
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| CN202020311806.3U Active CN211429598U (en) | 2020-03-13 | 2020-03-13 | Drive circuit and electronic product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113597053A (en) * | 2021-07-26 | 2021-11-02 | 南昌大学 | LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113597053A (en) * | 2021-07-26 | 2021-11-02 | 南昌大学 | LED drive circuit |
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