CN210491270U - Push-pull circuit, two-wire type LED drive circuit and lamp - Google Patents
Push-pull circuit, two-wire type LED drive circuit and lamp Download PDFInfo
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- CN210491270U CN210491270U CN201921201860.6U CN201921201860U CN210491270U CN 210491270 U CN210491270 U CN 210491270U CN 201921201860 U CN201921201860 U CN 201921201860U CN 210491270 U CN210491270 U CN 210491270U
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Abstract
The utility model discloses a push-pull circuit, a two-wire LED driving circuit and a lamp, which comprises a first switch path controlled by a first switch component, a second switch path controlled by a second switch component, a voltage drop component, a signal input end and a signal output end; the control end of the first switch component is electrically connected with the signal input end; the first switch path is connected with the second switch path in parallel, the control end of the second switch component is electrically connected with the first switch path so as to be switched on and off by the first switch component, and in the first switch component and the second switch component, one of the first switch component and the second switch component is switched on and off, and the other is switched off; the signal output end is electrically connected with the first switch path and the second switch path respectively, and the voltage drop component is connected in series with the first switch path or the second switch path to provide terminal voltage for the signal output end; this design simple structure to the less and lower component of cost of quantity builds push-pull circuit, provides better driving capability, and the loss is less.
Description
Technical Field
The utility model relates to a circuit field.
Background
As shown in fig. 1, a conventional push-pull circuit generally includes a switching tube Q2 'and a switching tube Q3', wherein, in one embodiment, the switching tube Q2 'is an NPN type triode, the switching tube Q3' is a PNP type triode, and in order to improve the amplification driving capability of the push-pull circuit, the push-pull circuit further includes a switching tube Q1 ', and a push-pull circuit formed by the switching tube Q1', the switching tube Q2 'and the switching tube Q3', an external high-low level signal is output to a control electrode of the switching tube Q1 ', and the switching tube Q1' is used to turn on and off the switching tube Q2 'and the switching tube Q3', so that the switching tube Q2 'and the switching tube Q3' are always in an on state and an off state, thereby improving the load driving capability and the switching speed, and reducing the conduction loss;
however, in terms of component selection, the push-pull circuit with the above structure must use three switching tubes, thereby resulting in a great increase in cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a push-pull circuit and two-wire formula LED drive circuit, save the cost, simple structure provides better driving force, and the loss is less.
The utility model adopts the technical proposal that:
a push-pull circuit comprises a first switch path, a second switch path, a voltage drop component, a signal input end and a signal output end, wherein the first switch path is controlled by a first switch component to be switched, the second switch path is controlled by a second switch component to be switched;
the control end of the first switch component is electrically connected with the signal input end;
the first switch path is connected with the second switch path in parallel, the control end of the second switch component is electrically connected with the first switch path so as to be switched on and off by the first switch component, and in the first switch component and the second switch component, one of the first switch component and the second switch component is switched on and off, and the other is switched off;
the signal output end is electrically connected with the first switch path and the second switch path respectively, and the voltage drop component is connected in series with the first switch path or the second switch path to provide terminal voltage for the signal output end.
The first switch assembly comprises a first switch tube Q1, and the second switch assembly comprises a second switch tube Q2 and a resistor R2;
the control electrode of the first switching tube Q1 is electrically connected with the signal input end;
one end of the resistor R2 is electrically connected to the input terminal of the second switch tube Q2 and the external power supply, respectively;
an input electrode of the first switch tube Q1 is electrically connected with the other end of the resistor R2, a control electrode of the second switch tube Q2, an output electrode of the second switch tube Q2, one end of the voltage drop component and the signal output end respectively;
the output pole of the first switch tube Q1 and the other end of the voltage drop component are both grounded.
The diode D1 is further included, and the cathode of the diode D1 is electrically connected with the input electrode of the first switching tube Q1, the other end of the resistor R2 and the control electrode of the second switching tube Q2 respectively;
the anode of the diode D1 is electrically connected to the output terminal of the second switch Q2, one end of the voltage drop element, and the signal output terminal.
A two-wire LED drive circuit comprises a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a first connecting end, a second connecting end and four groups of push-pull circuits, wherein the push-pull circuits are respectively a first push-pull circuit, a second push-pull circuit, a third push-pull circuit and a fourth push-pull circuit;
the input end of the first switch unit is electrically connected with an external power supply and the input end of the third switch unit respectively;
the output end of the first switch unit is electrically connected with the input end of the second switch unit and the first connecting end respectively;
the output end of the third switch unit is electrically connected with the input end of the fourth switch unit and the second connecting end respectively;
the output end of the second switch unit and the output end of the fourth switch unit are both grounded;
the signal output end of the first push-pull circuit is electrically connected with the control end of the first switch unit;
the signal output end of the second push-pull circuit is electrically connected with the control end of the second switch unit;
the signal output end of the third push-pull circuit is electrically connected with the control end of the third switching unit;
and the signal output end of the fourth push-pull circuit is electrically connected with the control end of the fourth switching unit.
The control unit is electrically connected with the signal output end of the first push-pull circuit, the signal output end of the second push-pull circuit, the signal output end of the third push-pull circuit and the signal output end of the fourth push-pull circuit respectively.
The first switch unit comprises a third switch tube Q3, a control electrode of the third switch tube Q3 is electrically connected with a signal output end of the first push-pull circuit, an input electrode of the third switch tube Q3 is electrically connected with an external power supply, and an output electrode of the third switch tube Q3 is electrically connected with an input end and a first connecting end of the second switch unit respectively.
The second switch unit comprises a fourth switch tube Q4, a control electrode of the fourth switch tube Q4 is electrically connected with a signal output end of the second push-pull circuit, an input electrode of the fourth switch tube Q4 is electrically connected with an output end and a first connecting end of the first switch unit respectively, and an output electrode of the fourth switch tube Q4 is grounded.
A lamp comprises an LED load and the two-wire LED driving circuit, wherein the LED load comprises at least two LED lamp strings which are reversely connected in parallel, one end of each LED lamp string is electrically connected with a first connecting end, and the other end of each LED lamp string is electrically connected with a second connecting end.
One of the above technical solutions has at least one of the following advantages or beneficial effects:
the utility model discloses push-pull circuit, the first switch module break-make of external control signal input control, for example, the first switch module of external control signal control switches on, the first switch route switches on, the second switch module is controlled by the first switch route and is disconnected, if the pressure drop subassembly is established ties and the second switch route, then signal output part is drawn low signal by the first switch route, and when the second switch module breaks off, the first switch route breaks off, the second switch module is controlled by the first switch route and switches on, the pressure drop subassembly provides the terminal voltage for signal output part, this design simple structure, build push-pull circuit with less and lower component of cost of quantity, provide better driving force, the loss is less;
the utility model also discloses a two-wire LED driving circuit and a lamp, which controls the LED load composed of at least two LED lamp strings which are reversely connected in parallel, when the first switching unit and the fourth switching unit are turned on, the second switching unit and the third switching unit are turned off, one LED lamp string is lighted, the other LED lamp string is extinguished, when the second switch unit and the third switch unit are conducted and the first switch unit and the fourth switch unit are disconnected, the other LED lamp string is lighted, one of the two circuits is turned off, and the first switch unit, the second switch unit, the third switch unit or the fourth switch unit is driven to operate by using the push-pull circuit, so that larger driving capability can be provided, under the power supply of higher voltage and current, the backlog of the first switch unit, the second switch unit, the third switch unit or the fourth switch unit is reduced, the serious heating is prevented, the loss is reduced, and the durability is improved.
Drawings
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a circuit schematic of a conventional push-pull circuit.
Fig. 2 is a circuit schematic diagram of an embodiment of the push-pull circuit of the present invention.
Fig. 3 is a circuit diagram of another embodiment of the push-pull circuit of the present invention.
Fig. 4 is a schematic circuit diagram of the two-wire LED driving circuit of the present invention.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 2 and 3, a push-pull circuit includes a first switch path 2 controlled by a first switch module 1, a second switch path 4 controlled by a second switch module 3, a voltage drop module 5, a signal input terminal, and a signal output terminal;
the control end of the first switch component is electrically connected with the signal input end;
the first switch path 2 is connected with the second switch path 4 in parallel, the control end of the second switch component 3 is electrically connected with the first switch path 2 so as to be controlled by the first switch component 1 to be switched on and switched off, and one of the first switch component 1 and the second switch component 3 is switched on and the other is switched off;
the signal output end is electrically connected with the first switch path 2 and the second switch path 4 respectively, and the voltage drop component 5 is connected in series with the first switch path 2 or the second switch path 4 to provide terminal voltage for the signal output end.
In some embodiments, the voltage drop component 5 may be a resistor or a voltage regulator tube;
the external control signal input controls the on-off of the first switch assembly 1, for example, the external control signal controls the on-off of the first switch assembly 1, the first switch path 2 is on, the second switch assembly 3 is controlled by the first switch path 2 to be off, if the voltage drop assembly 5 is connected in series with the second switch path 4, the signal output end is pulled down by the first switch path 2 to generate a signal, when the second switch assembly 3 is off, the first switch path 2 is off, the second switch assembly 3 is controlled by the first switch path 2 to be on, and the voltage drop assembly 5 provides terminal voltage for the signal output end.
In some embodiments, as shown in fig. 2, the first switching component 1 includes a first switching tube Q1, and the second switching component 3 includes a second switching tube Q2 and a resistor R2;
the control electrode of the first switching tube Q1 is electrically connected with the signal input end;
one end of the resistor R2 is electrically connected to the input terminal of the second switch tube Q2 and the external power supply, respectively;
an input electrode of the first switch tube Q1 is electrically connected with the other end of the resistor R2, a control electrode of the second switch tube Q2, an output electrode of the second switch tube Q2, one end of the voltage drop component 5 and the signal output end respectively;
the output pole of the first switching tube Q1 and the other end of the voltage drop component 5 are both grounded.
The diode D1 is further included, and the cathode of the diode D1 is electrically connected with the input electrode of the first switching tube Q1, the other end of the resistor R2 and the control electrode of the second switching tube Q2 respectively;
the anode of the diode D1 is electrically connected to the output terminal of the second switch Q2, one end of the voltage drop element 5, and the signal output terminal.
The first switch tube Q1 and the second switch tube Q2 may use NPN transistors;
in some embodiments, the first switching device is a PNP transistor Q13, the second switching device is a PNP transistor Q14, the voltage dropping device 5 is a resistor R13,
the base electrode of the triode Q13 is connected with the signal input end, and the emitter electrode of the triode Q13 is respectively and electrically connected with the external power supply, the signal output end and the emitter electrode of the triode Q14;
the collector of the triode Q13 is electrically connected with the base of the triode Q4 and one end of the resistor R13 respectively, the other end of the resistor R13 is grounded, and the collector of the triode Q14 is grounded.
The utility model discloses a specific embodiment still discloses a two-wire type LED drive circuit, including first switch unit 6, second switch unit 7, third switch unit 8, fourth switch unit 9, first link, second link and the push-pull circuit that any of the above-mentioned embodiment of four groups disclosed, be first push-pull circuit 10, second push-pull circuit 11, third push-pull circuit 12 and fourth push-pull circuit 13 respectively;
the input end of the first switch unit 6 is electrically connected with an external power supply and the input end of the third switch unit 8 respectively;
the output end of the first switch unit 6 is electrically connected with the input end of the second switch unit 7 and the first connection end respectively;
the output end of the third switching unit 8 is electrically connected with the input end of the fourth switching unit 9 and the second connection end respectively;
the output end of the second switch unit 7 and the output end of the fourth switch unit 9 are both grounded;
the signal output end of the first push-pull circuit 10 is electrically connected with the control end of the first switch unit 6;
the signal output end of the second push-pull circuit 11 is electrically connected with the control end of the second switch unit 7;
a signal output end of the third push-pull circuit 12 is electrically connected with a control end of the third switching unit 8;
a signal output end of the fourth push-pull circuit 13 is electrically connected to a control end of the fourth switching unit 9.
In some embodiments, the first switch unit 6 includes a third switch Q3, a control electrode of the third switch Q3 is electrically connected to the signal output terminal of the first push-pull circuit 10, an input electrode of the third switch Q3 is electrically connected to an external power source, and an output electrode of the third switch Q3 is electrically connected to the input terminal and the first connection terminal of the second switch unit 7, respectively.
The second switch unit 7 includes a fourth switch Q9, a control electrode of the fourth switch Q9 is electrically connected to the signal output end of the second push-pull circuit 11, an input electrode of the fourth switch Q9 is electrically connected to the output end and the first connection end of the first switch unit 6, respectively, and an output electrode of the fourth switch Q9 is grounded.
And the third and fourth switching units are similar in structure to the first and second switching units, as can be seen in fig. 4.
In the above embodiments, the third switching tube Q3, the fourth switching tube Q4, etc. may adopt MOS transistors or triodes.
The design controls the operation of an LED load formed by at least two LED lamp strings which are connected in parallel in an opposite direction, when the first switching unit 6 and the fourth switching unit 9 are turned on, the second switching unit 7 and the third switching unit 8 are turned off, one LED string lights on, the other LED string lights off, when the second switch unit 6 and the third switch unit 8 are conducted, the first switch unit 6 and the fourth switch unit 9 are disconnected, the other LED string lights on, one of them is extinguished, and the first switch unit 6, the second switch unit 7, the third switch unit 8 or the fourth switch unit 9 is driven to operate by using the push-pull circuit, so that a large driving capability can be provided, under the power supply of higher voltage and current, the backlog of the first switch unit 6, the second switch unit 7, the third switch unit 8 or the fourth switch unit 9 is reduced, the serious heating is prevented, the loss is reduced, and the durability is improved.
In some embodiments, the apparatus further includes a control unit (not shown), and the control unit is electrically connected to the signal output terminal of the first push-pull circuit 10, the signal output terminal of the second push-pull circuit 11, the signal output terminal of the third push-pull circuit 12, and the signal output terminal of the fourth push-pull circuit 13, respectively.
The control unit can select in the dimming chip with the PWM modulation function, except controlling the on-off of the first switch unit 6, the second switch unit 7, the third switch unit 8 or the fourth switch unit 9, and controlling the operation of the LED load 14, after the lamp is turned off, because the LED load is still connected to the anode of the power supply, if the lamp panel of the LED load has the electric leakage condition, afterglow occurs on the LED load easily, and the using effect is not good.
In the standby state, the control unit may control the first switching unit 6 and the third switching unit 8 to be turned off, and the second switching unit 7 and the fourth switching unit 9 to be turned on to be grounded, so that there is no afterglow phenomenon.
The utility model discloses a specific embodiment still discloses a lamps and lanterns, including the LED load 14 and the disclosed two-wire formula LED drive circuit of any above-mentioned embodiment, LED load 14 includes two at least LED lamp strings that reverse parallelly connected each other, the one end and the first link electric connection of LED lamp string, the other end and the second link electric connection of LED lamp string.
Two ends of the LED load 14 are directly connected into the two-wire LED driving circuit to control the operation of at least two LED lamp strings, the structure is simpler, three ports are not required to be connected into the traditional LED load formed by at least two LED lamp strings connected in parallel in the same direction, and the control is more convenient.
It is readily understood by those skilled in the art that the above-described preferred modes can be freely combined and superimposed without conflict.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (8)
1. A push-pull circuit is characterized by comprising a first switch path, a second switch path, a voltage drop assembly, a signal input end and a signal output end, wherein the first switch path is controlled by a first switch assembly to be switched, the second switch path is controlled by a second switch assembly to be switched;
the control end of the first switch component is electrically connected with the signal input end;
the first switch path is connected with the second switch path in parallel, the control end of the second switch component is electrically connected with the first switch path so as to be switched on and off by the first switch component, and in the first switch component and the second switch component, one of the first switch component and the second switch component is switched on and off, and the other is switched off;
the signal output end is electrically connected with the first switch path and the second switch path respectively, and the voltage drop component is connected in series with the first switch path or the second switch path to provide terminal voltage for the signal output end.
2. Push-pull circuit according to claim 1, wherein the first switching component comprises a first switching transistor Q1, the second switching component comprises a second switching transistor Q2 and a resistor R2;
the control electrode of the first switching tube Q1 is electrically connected with the signal input end;
one end of the resistor R2 is electrically connected to the input terminal of the second switch tube Q2 and the external power supply, respectively;
an input electrode of the first switch tube Q1 is electrically connected with the other end of the resistor R2, a control electrode of the second switch tube Q2, an output electrode of the second switch tube Q2, one end of the voltage drop component and the signal output end respectively;
the output pole of the first switch tube Q1 and the other end of the voltage drop component are both grounded.
3. The push-pull circuit according to claim 2, further comprising a diode D1, wherein a cathode of the diode D1 is electrically connected to the input terminal of the first switching transistor Q1, the other terminal of the resistor R2, and the control terminal of the second switching transistor Q2;
the anode of the diode D1 is electrically connected to the output terminal of the second switch Q2, one end of the voltage drop element, and the signal output terminal.
4. A two-wire LED driving circuit, comprising a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a first connection terminal, a second connection terminal, and four sets of push-pull circuits according to any one of claims 1 to 3, which are respectively a first push-pull circuit, a second push-pull circuit, a third push-pull circuit, and a fourth push-pull circuit;
the input end of the first switch unit is electrically connected with an external power supply and the input end of the third switch unit respectively;
the output end of the first switch unit is electrically connected with the input end of the second switch unit and the first connecting end respectively;
the output end of the third switch unit is electrically connected with the input end of the fourth switch unit and the second connecting end respectively;
the output end of the second switch unit and the output end of the fourth switch unit are both grounded;
the signal output end of the first push-pull circuit is electrically connected with the control end of the first switch unit;
the signal output end of the second push-pull circuit is electrically connected with the control end of the second switch unit;
the signal output end of the third push-pull circuit is electrically connected with the control end of the third switching unit;
and the signal output end of the fourth push-pull circuit is electrically connected with the control end of the fourth switching unit.
5. The two-wire LED driving circuit according to claim 4, further comprising a control unit electrically connected to the signal output terminal of the first push-pull circuit, the signal output terminal of the second push-pull circuit, the signal output terminal of the third push-pull circuit, and the signal output terminal of the fourth push-pull circuit, respectively.
6. The two-wire LED driving circuit as claimed in claim 4, wherein the first switch unit comprises a third switch tube Q3, a control electrode of the third switch tube Q3 is electrically connected to the signal output terminal of the first push-pull circuit, an input electrode of the third switch tube Q3 is electrically connected to an external power source, and an output electrode of the third switch tube Q3 is electrically connected to the input terminal and the first connection terminal of the second switch unit, respectively.
7. The two-wire LED driving circuit according to claim 4, wherein the second switch unit includes a fourth switch tube Q9, a control electrode of the fourth switch tube Q9 is electrically connected to the signal output terminal of the second push-pull circuit, an input electrode of the fourth switch tube Q9 is electrically connected to the output terminal of the first switch unit and the first connection terminal, respectively, and an output electrode of the fourth switch tube Q9 is grounded.
8. A lamp comprising an LED load and a two-wire LED driving circuit as claimed in any one of claims 4 to 7, wherein the LED load comprises at least two LED strings connected in anti-parallel with each other, one end of the LED strings is electrically connected to the first connecting terminal, and the other end of the LED strings is electrically connected to the second connecting terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921201860.6U CN210491270U (en) | 2019-07-26 | 2019-07-26 | Push-pull circuit, two-wire type LED drive circuit and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921201860.6U CN210491270U (en) | 2019-07-26 | 2019-07-26 | Push-pull circuit, two-wire type LED drive circuit and lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210491270U true CN210491270U (en) | 2020-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921201860.6U Active CN210491270U (en) | 2019-07-26 | 2019-07-26 | Push-pull circuit, two-wire type LED drive circuit and lamp |
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| Country | Link |
|---|---|
| CN (1) | CN210491270U (en) |
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2019
- 2019-07-26 CN CN201921201860.6U patent/CN210491270U/en active Active
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