CN211321567U - Driving circuit compatible with two different direct current supplies - Google Patents
Driving circuit compatible with two different direct current supplies Download PDFInfo
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- CN211321567U CN211321567U CN202020091311.4U CN202020091311U CN211321567U CN 211321567 U CN211321567 U CN 211321567U CN 202020091311 U CN202020091311 U CN 202020091311U CN 211321567 U CN211321567 U CN 211321567U
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Abstract
The utility model discloses a compatible two kinds of different DC power supply's drive circuit, including high voltage direct current power supply, low pressure DC power supply, voltage detection circuit, first isolation diode, second isolation diode, current control circuit and constant current control circuit, the input of voltage detection circuit is connected with high voltage direct current power supply and low pressure DC power supply respectively, the output of voltage detection circuit is connected with the input of first isolation diode and second isolation diode respectively; the output end of the first isolation diode is connected with the input end of the current control circuit, and the output end of the current control circuit is connected with the input end of the constant current control circuit; the output end of the second isolation diode is connected with the input end of the constant current control circuit; the output end of the constant current control circuit is connected with an LED load; the utility model discloses compatible two kinds of different DC power supply modes for the LED work light is applicable to the operating condition of multiple difference.
Description
Technical Field
The utility model relates to a LED lighting drive circuit technical field, concretely relates to compatible two kinds of different DC power supply's drive circuit.
Background
The LED working lamp is a lamp product which can be used for indoor or outdoor illumination, and the existing LED working lamp is usually powered by mains supply and cannot be used in a power-off or mains-supply-free place. Therefore, the LED working lamp which can be compatible with commercial power and direct current is available on the market, and when the commercial power exists, the commercial power can be used for supplying power, and when the commercial power does not exist, the direct current can be used for supplying power. However, when the LED working lamp does not have the commercial power, only one dc power source can be selected to supply power, if a dc generator or a vehicle-mounted dc power source or a dry battery is used to supply power, the LED working lamp cannot be compatible when two or more dc power sources coexist, so that the dc power supply mode is single, and the LED working lamp cannot be used without any dc power source.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a compatible two kinds of different DC power supply's drive circuit provides the DC power supply mode of two kinds of differences for the LED work light to solve the problem in the background art.
To achieve the above object, the present invention provides the following technical solutions: a drive circuit compatible with two different direct current supplies comprises a high-voltage direct current power supply, a low-voltage direct current power supply, a voltage detection circuit, a first isolation diode, a second isolation diode, a current control circuit and a constant current control circuit, wherein the input end of the voltage detection circuit is respectively connected with the high-voltage direct current power supply and the low-voltage direct current power supply, and the output end of the voltage detection circuit is respectively connected with the input end of the first isolation diode and the input end of the second isolation diode; the output end of the first isolation diode is connected with the input end of the current control circuit, and the output end of the current control circuit is connected with the input end of the constant current control circuit; the output end of the second isolation diode is connected with the input end of the constant current control circuit; the output end of the constant current control circuit is connected with an LED load;
when high-voltage direct current is input, the voltage detection circuit pulls the low-voltage direct current to the ground, and the high-voltage direct current passes through the voltage detection circuit, the first isolation diode, the current control circuit and the constant current control circuit and then is output to the LED load; when only low-voltage direct current is input, the low-voltage direct current passes through the voltage detection circuit, the second isolation diode and the constant current control circuit and then is output to the LED load.
Preferably, the high-voltage direct-current power supply adopts a 12V, 24V or 36V direct-current power supply, the low-voltage direct-current power supply adopts a plurality of dry batteries for supplying power, and the voltage of the high-voltage direct-current power supply is greater than that of the low-voltage direct-current power supply.
Further, the voltage detection circuit comprises a first resistor, a second resistor, a third resistor and a first MOS (metal oxide semiconductor) tube, wherein one end of the first resistor is connected with the high-voltage direct-current power supply, the other end of the first resistor is respectively connected with one end of the second resistor and a gate pole of the first MOS tube, the other end of the second resistor is connected with a zero line, a source electrode of the first MOS tube is connected with the zero line, a gate electrode of the first MOS tube is connected with one end of the third resistor, and the other end of the third resistor is connected with the low-voltage direct-current power supply. When the high-voltage direct current is input, the voltage is input into the first MOS tube after being divided by the first resistor and the second resistor, so that the first MOS tube is conducted, the low-voltage direct current is pulled to the ground, and the low-voltage direct current power supply does not work.
Furthermore, the current control circuit comprises a second voltage stabilizing diode, an eighth resistor, a third MOS transistor and a thirteenth resistor, wherein the cathode of the second voltage stabilizing diode is respectively connected with the output ends of the first isolation diode and the second isolation diode, the anode of the second voltage stabilizing diode is respectively connected with one end of the eighth resistor and the gate of the third MOS transistor, the other end of the eighth resistor is grounded, the source of the third MOS transistor is grounded, the drain of the third MOS transistor is connected with one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected with the constant current control circuit.
Further, the conduction voltage of the second voltage stabilizing diode is between the voltage of the high-voltage direct-current power supply and the voltage of the low-voltage direct-current power supply. When the high-voltage direct current is input, a second voltage stabilizing diode in the current control circuit is conducted; when the low-voltage direct current is input, the input voltage is less than the conduction voltage of the second voltage stabilizing diode, so that the current control circuit is not conducted, and the low-voltage direct current is directly input to the constant current control circuit.
Preferably, the driving circuit further comprises a voltage stabilizing circuit, a single chip microcomputer and a signal conversion compensation circuit, wherein the input ends of the voltage stabilizing circuit and the single chip microcomputer are respectively connected with the output end of the voltage detection circuit, the output ends of the voltage stabilizing circuit and the single chip microcomputer are respectively connected with the input end of the signal conversion compensation circuit, and the output end of the signal conversion compensation circuit is connected with the constant current control circuit.
Furthermore, the voltage stabilizing circuit comprises a first voltage stabilizing chip, a first capacitor and a second capacitor, the first voltage stabilizing chip is provided with three pins, the first pin of the first voltage stabilizing chip is respectively connected with one end of the first capacitor and one end of the second capacitor, and the common end of the first voltage stabilizing chip is grounded; a second pin of the first voltage stabilizing chip is respectively connected with the other end of the second capacitor and the signal conversion compensation circuit; and a third pin of the first voltage stabilizing chip is respectively connected with the other end of the first capacitor and the voltage detection circuit.
Furthermore, the single chip microcomputer comprises a second chip, a third capacitor and a first voltage stabilizing diode, the second chip is provided with eight pins, the first pin of the second chip is respectively connected with the cathode of the first voltage stabilizing diode and one end of the third capacitor, the common end of the second chip is connected with the voltage detection circuit, the second pin, the third pin, the fourth pin, the sixth pin and the seventh pin of the second chip are suspended, the fifth pin of the second chip is connected with the signal conversion compensation circuit, the eighth pin of the second chip is respectively connected with the anode of the first voltage stabilizing diode and the other end of the third capacitor, and the common end of the second chip is grounded.
Furthermore, the signal conversion compensation circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second triode and a fourth capacitor, wherein one end of the fourth resistor is connected with a fifth pin of a second chip and one end of the fifth resistor respectively, the other end of the fourth resistor is grounded, the other end of the fifth resistor is connected with a base electrode of the second triode, an emitter electrode of the second triode is connected with a second pin of the first voltage stabilizing chip, a collector electrode of the second triode is connected with one end of the sixth resistor, the other end of the sixth resistor is connected with one end of the fourth capacitor and one end of the seventh resistor respectively, the other end of the fourth capacitor is grounded, and the other end of the seventh resistor is connected with the constant current control circuit.
Compared with the prior art, the utility model, its beneficial effect lies in:
1. the utility model discloses a compatible two kinds of different DC power supply's drive circuit is used for detecting the DC power supply of different voltages through voltage detection circuit, makes the output current grow when high-voltage DC power supply through current control circuit, and normal output during low pressure DC power supply has compatible two kinds of different DC power supply modes for the LED work light is applicable to the operating condition of multiple difference.
2. The utility model discloses a set up voltage stabilizing circuit, singlechip and signal conversion compensating circuit, can compensate certain voltage and give constant current control circuit to the electric current size of main circuit output when reducing low-voltage DC power supply prolongs low-voltage DC power supply's supply time, reduces low-voltage DC power supply's the heat of generating heat simultaneously.
Drawings
Fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is a circuit diagram of the present invention.
In the figure: 10. a high voltage direct current power supply; 20. a low voltage DC power supply; 30. a zero line; 40. a voltage detection circuit; 50. a current control circuit; 60. a constant current control circuit; 70. a voltage stabilizing circuit; 80. a single chip microcomputer; 90. and a signal conversion compensation circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further specifically described below by way of embodiments and with reference to the accompanying drawings.
Example 1
A drive circuit compatible with two different direct current supplies is disclosed in figures 1 and 2, and comprises a high-voltage direct current power supply 10, a low-voltage direct current power supply 20, a voltage detection circuit 40, a first isolation diode D1, a second isolation diode D2, a current control circuit 50, a constant current control circuit 60, a voltage stabilizing circuit 70, a single chip microcomputer 80 and a signal conversion compensation circuit 90, wherein the input end of the voltage detection circuit 40 is respectively connected with the high-voltage direct current power supply 10 and the low-voltage direct current power supply 20, and the output end of the voltage detection circuit 40 is respectively connected with the input end of a first isolation diode D1 and the input end of a second isolation diode D2; the output end of the first isolation diode D1 is connected with the input end of the current control circuit 50, and the output end of the current control circuit 50 is connected with the input end of the constant current control circuit 60; the output end of the second isolation diode D2 is connected with the input end of the constant current control circuit 60; the output of the constant current control circuit 60 is connected to the LED load.
The high voltage DC power supply 10 can adopt 12V, 24V or 36V DC power supply, and the low voltage DC power supply 20 can adopt a plurality of dry batteries for power supply. In this embodiment, the high voltage dc power supply 10 is a 12V dc power supply, the low voltage dc power supply 20 is formed by connecting three dry batteries in series, and the voltage of each dry battery is 1.5V, which is 4.5V in total.
In the above structure, the voltage detection circuit 40 is used for detecting the input direct current, when the high-voltage direct current is input, the voltage detection circuit 40 pulls the low-voltage direct current to the ground, and the high-voltage direct current passes through the voltage detection circuit 40, the first isolation diode D1, the current control circuit 50 and the constant current control circuit 60 and is then output to the LED load; when only low-voltage direct current is input, the low-voltage direct current passes through the voltage detection circuit 40, the second isolation diode D2 and the constant current control circuit 60 and is then output to the LED load.
When the high voltage direct current is used for power supply, the current passing through the main circuit is large, and when the low voltage direct current is used for power supply, the current flowing through the main circuit needs to be reduced in order to prolong the power supply time and prevent the battery from overheating. Based on this, the driving circuit further includes a voltage stabilizing circuit 70, a single chip 80 and a signal conversion compensation circuit 90. The input ends of the voltage stabilizing circuit 70 and the single chip microcomputer 80 are respectively connected with the output end of the voltage detection circuit 40, the output ends of the voltage stabilizing circuit 70 and the single chip microcomputer 80 are respectively connected with the input end of the signal conversion compensation circuit 90, and the output end of the signal conversion compensation circuit 90 is connected with the constant current control circuit 60. The voltage stabilizing circuit 70 provides a stable reference voltage for the signal conversion compensation circuit 90, the single chip microcomputer 80 outputs a PWM signal to the signal conversion compensation circuit 90, the signal conversion compensation circuit 90 converts the PWM signal into a dc voltage and outputs the dc voltage to the constant current control chip U3 in the constant current control circuit 60, and the constant current control chip U3 in the constant current control circuit 60 is used for compensating a certain voltage, so as to reduce the magnitude of the current output from the main circuit during low-voltage dc power supply, prolong the battery power supply time, and reduce the heat generated by the battery.
Referring to fig. 2, the voltage detection circuit 40 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first MOS transistor Q1, wherein one end of the first resistor R1 is connected to the high voltage dc power supply 10, the other end of the first resistor R1 is connected to one end of a second resistor R2 and a gate of the first MOS transistor Q1, the other end of the second resistor R2 is connected to the neutral line 30, a source of the first MOS transistor Q1 is connected to the neutral line 30, a gate of the first MOS transistor Q1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the low voltage dc power supply 20. When the high-voltage direct current is input, the voltage is divided by the first resistor R1 and the second resistor R2 and then input into the first MOS transistor Q1, so that the first MOS transistor Q1 is turned on, the low-voltage direct current is pulled to the ground, and the low-voltage direct current power supply 20 does not work.
The current control circuit 50 includes a second zener diode DZ2, an eighth resistor R8, a third MOS transistor Q3, and a thirteenth resistor R13, a cathode of the second zener diode DZ2 is connected to output terminals of the first isolation diode D1 and the second isolation diode D2, an anode of the second zener diode DZ2 is connected to one end of the eighth resistor R8 and a gate of the third MOS transistor Q3, another end of the eighth resistor R8 is grounded, a source of the third MOS transistor Q3 is grounded, a drain of the third MOS transistor Q3 is connected to one end of the thirteenth resistor R13, and another end of the thirteenth resistor R13 is connected to the constant current control circuit 60. The turn-on voltage of the second zener diode DZ2 is between the voltage of the high voltage dc power supply 10 and the voltage of the low voltage dc power supply 20. When high-voltage direct current is input, the second zener diode DZ2 in the current control circuit 50 is turned on, the voltage is divided by the second zener diode DZ2 and the eighth resistor R8, the third MOS transistor Q3 is turned on, and the thirteenth resistor R13 is connected in parallel to two ends of the fourteenth resistor R14 in the constant current control circuit 60, so that the current flowing through the LED load is increased; when the low-voltage dc power is input, since the input voltage is smaller than the conduction voltage of the second zener diode DZ2, the current control circuit 50 is not turned on, so that the low-voltage dc power is directly input to the constant current control circuit 60.
The voltage stabilizing circuit 70 comprises a first voltage stabilizing chip U1, a first capacitor C1 and a second capacitor C2, the first voltage stabilizing chip U1 is provided with three pins, the first pin of the first voltage stabilizing chip U1 is respectively connected with one end of the first capacitor C1 and one end of the second capacitor C2, and the common end of the first voltage stabilizing chip U1 is grounded; a second pin of the first voltage stabilizing chip U1 is connected to the other end of the second capacitor C2 and the signal conversion compensation circuit 90, respectively; the third pin of the first voltage regulation chip U1 is connected to the other end of the first capacitor C1 and the common terminal of the third resistor R3 and the first MOS transistor Q1 in the voltage detection circuit 40, respectively. When the low-voltage direct current is supplied, the low-voltage direct current passes through the third resistor R3 and then is input to the voltage stabilizing circuit 70, and then passes through the voltage stabilizing circuit 70 to output a stable voltage to the signal conversion compensation circuit 90.
The single chip microcomputer 80 comprises a second chip U2, a third capacitor C3 and a first zener diode DZ1, the second chip U2 is provided with eight pins, a first pin of the second chip U2 is respectively connected with a cathode of the first zener diode DZ1 and one end of the third capacitor C3, a common end of the second chip U2 is connected with a common end of a third resistor R3 and a first MOS transistor Q1 in the voltage detection circuit 40, a second pin, a third pin, a fourth pin, a sixth pin and a seventh pin of the second chip U2 are suspended, a fifth pin of the second chip U2 is connected with the signal conversion compensation circuit 90, an eighth pin of the second chip U2 is respectively connected with an anode of the first zener diode DZ1 and the other end of the third capacitor C3, and the common end of the second chip U2 is grounded. When the low-voltage direct current is supplied, the low-voltage direct current supplies power to the second chip U2 after passing through the third resistor R3, and the second chip U2 outputs a PWM signal to the signal conversion compensation circuit 90 through the fifth pin.
The signal conversion compensation circuit 90 comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second triode Q2 and a fourth capacitor C4, wherein one end of the fourth resistor R4 is respectively connected with the fifth pin of the second chip U2 and one end of the fifth resistor R5, the other end of the fourth resistor R4 is grounded, the other end of the fifth resistor R5 is connected with the base of the second triode Q2, the emitter of the second triode Q2 is connected with the second pin of the first voltage stabilization chip U1, the collector of the second triode Q2 is connected with one end of the sixth resistor R6, the other end of the sixth resistor R6 is respectively connected with one end of the fourth capacitor C4 and one end of the seventh resistor R7, the other end of the fourth capacitor C4 is grounded, and the other end of the seventh resistor R7 is connected with the constant current control circuit 60. The signal conversion compensation circuit 90 can conduct the second triode Q2 through the PWM signal inputted by the single chip 80, so that the voltage inputted by the voltage stabilizing circuit 70 and received by the emitter of the second triode Q2 in the signal conversion compensation circuit 90 is outputted to the constant current control circuit 60 to compensate for a certain voltage, thereby reducing the current inputted by the low-voltage direct current on the main circuit, prolonging the discharging time of the low-voltage direct current, and reducing the heat generated by the battery.
In this embodiment, the constant current control circuit 60 is a conventional circuit in the field of LED working lamps, and therefore, the details are not repeated in this case.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (9)
1. A drive circuit compatible with two different direct current supplies is characterized by comprising a high-voltage direct-current power supply, a low-voltage direct-current power supply, a voltage detection circuit, a first isolation diode, a second isolation diode, a current control circuit and a constant-current control circuit, wherein the input end of the voltage detection circuit is respectively connected with the high-voltage direct-current power supply and the low-voltage direct-current power supply, and the output end of the voltage detection circuit is respectively connected with the input end of the first isolation diode and the input end of the second isolation diode; the output end of the first isolation diode is connected with the input end of the current control circuit, and the output end of the current control circuit is connected with the input end of the constant current control circuit; the output end of the second isolation diode is connected with the input end of the constant current control circuit; the output end of the constant current control circuit is connected with an LED load;
when high-voltage direct current is input, the voltage detection circuit pulls the low-voltage direct current to the ground, and the high-voltage direct current passes through the voltage detection circuit, the first isolation diode, the current control circuit and the constant current control circuit and then is output to the LED load; when only low-voltage direct current is input, the low-voltage direct current passes through the voltage detection circuit, the second isolation diode and the constant current control circuit and then is output to the LED load.
2. The driving circuit compatible with two different direct current powers as claimed in claim 1, wherein the high voltage direct current power supply adopts a 12V, 24V or 36V direct current power supply, the low voltage direct current power supply adopts a plurality of dry batteries for power supply, and the voltage of the high voltage direct current power supply is greater than that of the low voltage direct current power supply.
3. The driving circuit according to claim 1, wherein the voltage detection circuit comprises a first resistor, a second resistor, a third resistor and a first MOS transistor, one end of the first resistor is connected to the high voltage dc power supply, the other end of the first resistor is connected to one end of the second resistor and a gate of the first MOS transistor, respectively, the other end of the second resistor is connected to a zero line, a source of the first MOS transistor is connected to the zero line, a gate of the first MOS transistor is connected to one end of the third resistor, and the other end of the third resistor is connected to the low voltage dc power supply.
4. The driving circuit according to claim 1, wherein the current control circuit comprises a second zener diode, an eighth resistor, a third MOS transistor, and a thirteenth resistor, a cathode of the second zener diode is connected to output terminals of the first isolation diode and the second isolation diode, an anode of the second zener diode is connected to one end of the eighth resistor and a gate of the third MOS transistor, another end of the eighth resistor is grounded, a source of the third MOS transistor is grounded, a drain of the third MOS transistor is connected to one end of the thirteenth resistor, and another end of the thirteenth resistor is connected to the constant current control circuit.
5. A driving circuit compatible with two different DC power supplies according to claim 4, wherein the conduction voltage of the second Zener diode is between the voltage of the high voltage DC power supply and the voltage of the low voltage DC power supply.
6. The driving circuit according to claim 1, wherein the driving circuit further comprises a voltage stabilizing circuit, a single chip, and a signal conversion compensation circuit, wherein the input terminals of the voltage stabilizing circuit and the single chip are respectively connected to the output terminal of the voltage detection circuit, the output terminals of the voltage stabilizing circuit and the single chip are respectively connected to the input terminal of the signal conversion compensation circuit, and the output terminal of the signal conversion compensation circuit is connected to the constant current control circuit.
7. The driving circuit according to claim 6, wherein the voltage regulator circuit comprises a first voltage regulator chip, a first capacitor and a second capacitor, the first voltage regulator chip has three pins, the first pin of the first voltage regulator chip is connected to one end of the first capacitor and one end of the second capacitor, respectively, and the common terminal is grounded; a second pin of the first voltage stabilizing chip is respectively connected with the other end of the second capacitor and the signal conversion compensation circuit; and a third pin of the first voltage stabilizing chip is respectively connected with the other end of the first capacitor and the voltage detection circuit.
8. The driving circuit according to claim 7, wherein the single chip comprises a second chip, a third capacitor and a first zener diode, the second chip has eight pins, the first pin of the second chip is respectively connected to the cathode of the first zener diode and one end of the third capacitor, and the common terminal of the second chip is connected to the voltage detection circuit, the second pin, the third pin, the fourth pin, the sixth pin and the seventh pin of the second chip are floating, the fifth pin of the second chip is connected to the signal conversion compensation circuit, the eighth pin of the second chip is respectively connected to the anode of the first zener diode and the other end of the third capacitor, and the common terminal of the second chip is grounded.
9. A driver circuit compatible with two different DC supplies according to claim 8, the signal conversion compensation circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second triode and a fourth capacitor, one end of the fourth resistor is respectively connected with the fifth pin of the second chip and one end of the fifth resistor, the other end of the fourth resistor is grounded, the other end of the fifth resistor is connected with the base electrode of the second triode, an emitting electrode of the second triode is connected with a second pin of the first voltage stabilizing chip, a collector electrode of the second triode is connected with one end of the sixth resistor, the other end of the sixth resistor is respectively connected with one end of the fourth capacitor and one end of the seventh resistor, the other end of the fourth capacitor is grounded, and the other end of the seventh resistor is connected with the constant current control circuit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113329554A (en) * | 2021-06-10 | 2021-08-31 | 四川大学 | Hand-held low-temperature plasma sterilization instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113329554A (en) * | 2021-06-10 | 2021-08-31 | 四川大学 | Hand-held low-temperature plasma sterilization instrument |
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