CN210491273U - Non-isolated driving circuit - Google Patents
Non-isolated driving circuit Download PDFInfo
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- CN210491273U CN210491273U CN201921230253.2U CN201921230253U CN210491273U CN 210491273 U CN210491273 U CN 210491273U CN 201921230253 U CN201921230253 U CN 201921230253U CN 210491273 U CN210491273 U CN 210491273U
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Abstract
The utility model discloses a the utility model provides a technical scheme that its technical problem provided is: a non-isolated drive circuit comprising: a switch unit connectable to an external power supply; the switch unit, the energy storage unit, an external power supply and an external load can form an energy storage power supply loop, and the energy storage unit and the external load can form an energy release power supply loop; the current compensation unit is connected with the energy storage unit to generate compensation current when the energy storage unit releases energy, and the current compensation unit and an external load can form an energy release compensation loop. The current compensation unit generates compensation current and forms an energy release compensation loop with the external load, so that the current generated by energy release of the energy storage unit is superposed with the compensation current to form larger current to supply power to the external load, and the external load with large current demand can be driven to meet the use demand.
Description
Technical Field
The utility model relates to a drive power supply especially relates to non-isolation drive circuit.
Background
As a new generation of light source, LEDs are widely used in different fields, such as advertising boards, roadside lighting, indoor decoration, etc., due to their advantages of high brightness, low power consumption, and long service life.
The LED works and needs a driving power supply, the general driving power supply is divided into an isolated power supply and a non-isolated power supply, the input end and the output end of the non-isolated power supply are directly connected, electric energy is not converted into other types of energy in the midway, the conversion efficiency is high, and the cost is lower; the input end and the output end of the isolation power supply are isolated, and the electric energy is converted into other types of energy in midway, for example, the isolation power supply with an isolation transformer can generate conversion of electric energy-magnetic energy-electric energy in the power supply process, and the conversion efficiency is low, the structure is complex, and the cost is high.
In the prior art, referring to fig. 1 and fig. 2, in a common non-isolated driving circuit, when a MOS transistor Q1 (a switch chip U1) is turned on, an external power supply supplies power to an external load and charges an inductor L2 (an inductor L4), when the MOS transistor Q1 (a switch chip U1) is turned off, the inductor L2 (an inductor L4) forms a loop with the external load through a diode D2 (a diode D5) to release energy and output current, so that the external load can continue to operate, and a capacitor C2 (a capacitor C4) filters to reduce fluctuations of voltage and current, so that the external load operates more stably. In the above process, at the moment when the MOS transistor Q1 (the switch chip U1) is turned off, the inductor L2 (the inductor L4) generates a large reverse voltage, the requirement on the withstand voltage of the MOS transistor Q1 (the switch chip U1) is high, and the current output by the inductor L2 (the inductor L4) in releasing energy is small.
Due to the circuit structure, the non-isolated power supply can only output high-voltage low current generally and cannot meet the load with large current demand, while the isolated power supply can meet the demand for large current, but has the problems of high manufacturing cost and low conversion efficiency.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model provides a non-isolation drive circuit, it can export heavy current and conversion efficiency is high.
The utility model provides a technical scheme that its technical problem provided is: a non-isolated drive circuit comprising:
a switch unit connectable to an external power supply;
the switch unit, the energy storage unit, an external power supply and an external load can form an energy storage power supply loop, and the energy storage unit and the external load can form an energy release power supply loop;
the current compensation unit is connected with the energy storage unit to generate compensation current when the energy storage unit releases energy, and the current compensation unit and an external load can form an energy release compensation loop.
Preferably, the energy storage unit comprises a first inductor, the current compensation unit comprises a coupling circuit, the coupling circuit is coupled with the first inductor to generate a compensation current when the first inductor is de-energized, and an output end of the coupling circuit can be connected with an external load.
Preferably, the coupling circuit includes a second inductor and an auxiliary diode, the first inductor is coupled with the second inductor, the auxiliary diode is connected in series with the second inductor to form a series circuit, one end of the series circuit close to the cathode of the diode is connected with the anode of the external load, and the other end of the series circuit is connected with the cathode of the external load.
Preferably, the number of turns of the first inductor is greater than the number of turns of the second inductor.
Preferably, the inductor further comprises a filter unit, and the first inductor is connected with an external load through the filter unit.
Preferably, the inductor further comprises a freewheeling diode, a cathode of the freewheeling diode is connected with an external power source, and an anode of the freewheeling diode is connected with the first inductor or an external load.
Preferably, the circuit further comprises an absorption circuit, one end of the absorption circuit is connected with the switch unit, and the other end of the absorption circuit is connected with an external load.
Preferably, the absorption circuit comprises an absorption capacitor and an absorption resistor, and the absorption capacitor is connected with the absorption resistor in parallel.
Preferably, the switching unit includes a switching tube Q2, and the filtering unit includes a filtering capacitor;
the input end of the switching tube Q2 is respectively connected with one end of the first inductor and the anode of the freewheeling diode, the control end of the switching tube Q2 is connected with an external control signal, and the output end of the switching tube Q2 is connected with the cathode of an external power supply or grounded;
the cathode of the freewheeling diode is connected with one end of the absorption capacitor and one end of the absorption resistor respectively;
the other end of the absorption resistor is respectively connected with the other end of the absorption capacitor, the cathode of the auxiliary diode, an external power supply, one end of the filter capacitor and the anode of an external load;
the anode of the auxiliary diode is connected with one end of the second inductor;
and the dotted terminal of the second inductor is respectively connected with the dotted terminal of the first inductor, the other end of the filter capacitor and the negative electrode of the external load.
Preferably, the switch unit comprises a switch chip U2, and the filter unit comprises a filter capacitor;
the input end of the switch chip U1 is connected with the positive electrode of an external power supply, and the output end of the switch chip U1 is respectively connected with one end of the absorption capacitor, one end of the absorption resistor and one end of the first inductor;
the other end of the absorption capacitor is respectively connected with the other end of the absorption resistor and the cathode of the fly-wheel diode;
the anode of the freewheeling diode is respectively connected with the anode of the auxiliary diode, one end of the filter capacitor, the cathode of an external power supply and the cathode of an external load;
the cathode of the auxiliary diode is connected with one end of the second inductor;
and the dotted terminal of the second inductor is respectively connected with the dotted terminal of the first inductor, the other end of the filter capacitor and the anode of an external load.
The utility model has the advantages that: the switch unit is periodically switched on and off, when the switch unit is switched on, the energy storage unit stores energy in the energy storage power supply loop, and when the switch unit is switched off, the energy is released in the energy release power supply loop. The energy storage unit periodically stores and releases energy, the direct current with small fluctuation is formed to supply power to an external load, when the energy storage unit releases energy, compensation current is generated through the current compensation unit, and the current compensation unit and the external load form an energy release compensation loop, so that the current generated by energy release of the energy storage unit is superposed with the compensation current to form larger current to supply power to the external load, and further the external load with large current demand can be driven, the use requirement is met, and the energy conversion efficiency is high, and the manufacturing cost is low.
Drawings
The invention will be further described with reference to the following figures and examples:
FIG. 1 is an embodiment of a prior art non-isolated drive circuit;
FIG. 2 is another embodiment of a prior art non-isolated drive circuit;
FIG. 3 is an embodiment of the present invention;
fig. 4 is another embodiment 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.
Referring to fig. 3 and 4, the present invention provides a non-isolated driving circuit, including:
a switch unit 10 connectable to an external power supply;
the energy storage unit 20, the switch unit 10, the energy storage unit 20, the external power supply and the external load can form an energy storage power supply loop, and the energy storage unit 20 and the external load can form an energy release power supply loop;
and the current compensation unit 40 is connected with the energy storage unit 20 to generate a compensation current when the energy storage unit 20 releases energy, and the current compensation unit 40 and an external load can form an energy release compensation loop.
The switch unit 10 is periodically switched on and off, when the switch unit 10 is switched on, the energy storage unit 20 stores energy in the energy storage power supply loop, and when the switch unit 10 is switched off, the energy is released in the energy release power supply loop. Energy storage unit 20 periodically stores energy and releases energy, form the direct current of small fluctuation and supply power to external load, when energy storage unit 20 releases energy, produce compensating current through current compensation unit 40, and current compensation unit 40 forms the compensation return circuit of releasing energy with external load, make the electric current that energy storage unit 20 released energy production and compensating current superpose and form bigger electric current and supply power to external load, and then can drive the external load that the electric current demand is big, satisfy the user demand, and have the advantage that electric energy conversion is efficient, the cost of manufacture is low.
The switch unit 10 may be a switching tube such as a triode, an MOS tube, etc. as shown in fig. 3, and a control end of the switching tube is connected with a control signal such as PWM, etc. to be periodically turned on and off; it may also be a switch chip as shown in fig. 4, and the switch chip is also periodically turned on and off to charge the energy storage unit 20 with the external power source. The energy storage unit 20 may be an RL circuit or the like.
Referring to fig. 3 and 4, as a preferred embodiment, the energy storage unit 20 includes a first inductor 21, and the current compensation unit 40 includes a coupling circuit coupled to the first inductor 21 to generate a compensation current when the first inductor 21 is de-energized, and an output terminal of the coupling circuit is connectable to an external load. The energy storage unit 20 is a first inductor 21, and the coupling circuit is coupled to the first inductor 21, so that the effect of generating the compensation current can be achieved through a passive device, and the energy storage unit is simple in structure and easy to implement.
Referring to fig. 3 and 4, as a preferred embodiment of the coupling circuit, the coupling circuit includes a second inductor 41 and an auxiliary diode 42, the first inductor 21 is coupled with the second inductor 41, the auxiliary diode 42 is connected with the second inductor 41 in series to form a series circuit, one end of the series circuit near the cathode of the diode is connected with the anode of the external load, and the other end of the series circuit is connected with the cathode of the external load.
When the switching unit 10 is turned on, the energy storage power supply circuit operates, the external power supply supplies power to the external load, and the external power supply charges the first inductor 21, due to the unidirectional conducting characteristic of the auxiliary diode 42, no current flows through the second inductor 41, when the switch unit 10 is turned off, the first inductor 21 releases energy to output current, the energy-releasing power supply loop works, because the first inductor 21 is coupled with the second inductor 41, the second inductor 41 generates a compensation current under the mutual inductance, the energy release compensation loop also works, the output current of the first inductor 21 and the compensation current are superposed and flow to the external load, so as to achieve the effect of increasing the current supplied to the external load, and because the energy stored in the first inductor 21 is partially transferred to the second inductor 41 to become an induced current, the reverse voltage of the first inductor 21 is reduced, the requirement on the withstand voltage of the switching unit 10 is reduced, and the protection of the switching unit 10 and devices in other circuits from being damaged by high voltage is facilitated.
To further increase the magnitude of the compensation current, the number of turns of the first inductor 21 is greater than the number of turns of the second inductor 41. The number of turns of the first inductor 21 is larger than that of turns of the second inductor 41, and the magnitude of the induced current is inversely proportional to the number of turns, so that the induced current generated in the second inductor 41, i.e. the compensation current, is larger than the current output by the first inductor 21, and when the two currents are superposed, a larger current is formed, and the reverse voltage generated by the first inductor 21 is favorably reduced, so that other devices in the circuit are prevented from being damaged by the reverse high voltage.
Referring to fig. 3 and 4, in order to make the power supply to the external load more smooth, a filter unit 30 is further included, and the first inductor 21 is connected to the external load through the filter unit 30. Because the energy stored and released by the first inductor 21 can generate small fluctuation, the voltage and the current are filtered by the filtering unit 30, so that the voltage and the current are more stable and stable, and the normal work of an external load is facilitated.
Referring to fig. 3 and 4, as a preferred embodiment, a freewheeling diode 50 is further included, a cathode of the freewheeling diode 50 is connected to an external power source, and an anode of the freewheeling diode 50 is connected to the first inductor 21 or an external load. When the switching unit 10 is turned off, the first inductor 21 can form an energy releasing power supply loop with an external load through the freewheeling diode 50 to release the stored energy to form an output current. Fig. 3 and 4 are embodiments in a similar buck chopper circuit, and a freewheeling diode 50 is needed to form a loop with the external load when the first inductor 21 is de-energized, and in other embodiments in a similar boost chopper circuit, the freewheeling diode 50 can be omitted if the first inductor 21 can directly form a de-energized supply loop with the external load when de-energized.
In order to operate more stably, the switch device further includes an absorption circuit 60, one end of the absorption circuit 60 is connected to the switch unit 10, and the other end of the absorption circuit 60 is connected to an external load. The absorption circuit 60 is used for alleviating voltage and current fluctuation generated when the switch unit 10 is switched on and switched off so as to protect devices in the circuit and avoid damage, and further the reliability of the circuit is improved. The absorption circuit 60 may be an RL circuit or an LC circuit or the like.
Referring to fig. 3 and 4, as a preferred embodiment of the absorption circuit 60, the absorption circuit 60 includes an absorption capacitor 61 and an absorption resistor 62, and the absorption capacitor 61 is connected in parallel with the absorption resistor 62. The absorption capacitor 61 and the absorption resistor 62 are connected in parallel to form an RC circuit, and the structure is simple and the size is small.
Referring to fig. 3, as an embodiment of the present invention, the switch unit 10 includes a switch tube Q2, and the filter unit 30 includes a filter capacitor 31;
the input end of the switching tube Q2 is respectively connected with one end of the first inductor 21 and the anode of the freewheeling diode 50, the control end of the switching tube Q2 is connected with an external control signal, and the output end of the switching tube Q2 is connected with the cathode of an external power supply or grounded;
the cathode of the freewheeling diode 50 is connected to one end of the absorption capacitor 61 and one end of the absorption resistor 62, respectively;
the other end of the absorption resistor 62 is connected to the other end of the absorption capacitor 61, the cathode of the auxiliary diode 42, the external power supply, one end of the filter capacitor 31, and the anode of the external load, respectively;
the anode of the auxiliary diode 42 is connected to one end of the second inductor 41;
the dotted terminal of the second inductor 41 is connected to the dotted terminal of the first inductor 21, the other terminal of the filter capacitor 31, and the negative electrode of the external load.
When the switch tube Q2 is turned on, the external power supply input current supplies power to the external load and simultaneously charges the first inductor 21, at the moment, the auxiliary diode 42 is turned off in the reverse direction, and no current flows through the second inductor 41. When the switch Q2 is turned off, the switch Q2 is equivalent to an open circuit, the external power supply does not supply power to the external load, the first inductor 21 releases the output current, and outputs the current to the external load through the freewheeling diode 50, at this time, because of the mutual inductance and the number of turns of the second inductor 41 is smaller than that of the first inductor 21, the induced current of the second inductor 41, i.e., the compensation current, is larger than that of the first inductor 21, the compensation current generated by the second inductor 41 flows to the external load through the auxiliary diode 42, and the output current of the first inductor 21 and the compensation current are superposed to form a larger current to supply power to the external load. The absorption capacitor 61 and the absorption resistor 62 alleviate voltage fluctuation and current fluctuation generated at the moment when the switching tube Q2 is switched on and off, and the filter capacitor 31 can alleviate voltage fluctuation and power fluctuation generated by energy storage and release of the first inductor 21.
Referring to fig. 4, in another embodiment of the present invention, the switch unit 10 includes a switch chip U2, and the filter unit 30 includes a filter capacitor 31;
the input end of the switch chip U1 is connected with the positive electrode of the external power supply, and the output end of the switch chip U1 is respectively connected with one end of the absorption capacitor 61, one end of the absorption resistor 62 and one end of the first inductor 21;
the other end of the absorption capacitor 61 is connected to the other end of the absorption resistor 62 and the cathode of the freewheeling diode 50;
the anode of the freewheeling diode 50 is connected to the anode of the auxiliary diode 42, one end of the filter capacitor 31, the cathode of the external power supply, and the cathode of the external load, respectively;
the cathode of the auxiliary diode 42 is connected to one end of the second inductor 41;
the dotted terminal of the second inductor 41 is connected to the dotted terminal of the first inductor 21, the other terminal of the filter capacitor 31, and the positive electrode of the external load.
When the switch chip U2 is turned on, the switch chip U2 outputs current to supply power to an external load, and simultaneously charges the first inductor 21, and the auxiliary diode 42 is turned off in the reverse direction to make no current flow through the second inductor 41. When the switch chip U2 is turned off, no current is output, the first inductor 21 forms an energy release power supply loop with an external load through the freewheeling diode 50, at this time, the second inductor 41 generates an induced current, i.e., a compensation current, the auxiliary diode 42 is turned on, the second inductor 41, the auxiliary diode 42 and the external load form an energy release compensation loop, and the current output by the first inductor 21 and the compensation current generated by the second inductor 41 are superposed to supply power to the external load. The snubber capacitor 61 and the snubber resistor 62 mitigate current fluctuations in the circuit caused by the switching of the switch chip U2, and the filter capacitor 31 mitigates current fluctuations flowing to the external load.
The above embodiments are merely preferred embodiments of the present invention, and other embodiments are also possible. Equivalent modifications or substitutions may be made by those skilled in the art without departing from the spirit of the invention, and such equivalent modifications or substitutions are intended to be included within the scope of the claims set forth herein.
Claims (10)
1. A non-isolated driver circuit, comprising:
a switch unit (10) that can be connected to an external power supply;
the energy storage unit (20), the switch unit (10), the energy storage unit (20), an external power supply and an external load can form an energy storage power supply loop, and the energy storage unit (20) and the external load can form an energy release power supply loop;
the current compensation unit (40) is connected with the energy storage unit (20) to generate a compensation current when the energy storage unit (20) releases energy, and the current compensation unit and an external load can form an energy release compensation loop.
2. The non-isolated driver circuit of claim 1, wherein: the energy storage unit (20) comprises a first inductor (21), the current compensation unit (40) comprises a coupling circuit, the coupling circuit is coupled with the first inductor (21) to generate a compensation current when the first inductor (21) releases energy, and the output end of the coupling circuit can be connected with an external load.
3. The non-isolated driver circuit of claim 2, wherein: the coupling circuit comprises a second inductor (41) and an auxiliary diode (42), the first inductor (21) is coupled with the second inductor (41), the auxiliary diode (42) is connected with the second inductor (41) in series to form a series circuit, one end of the series circuit close to the cathode of the diode is connected with the anode of an external load, and the other end of the series circuit is connected with the cathode of the external load.
4. The non-isolated driver circuit of claim 3, wherein: the number of turns of the first inductor (21) is greater than the number of turns of the second inductor (41).
5. The non-isolated driver circuit of claim 3 or 4, wherein: the inductor comprises a filtering unit (30), and the first inductor (21) is connected with an external load through the filtering unit (30).
6. The non-isolated driver circuit of claim 5, wherein: the inductor further comprises a freewheeling diode (50), the cathode of the freewheeling diode (50) is connected with an external power supply, and the anode of the freewheeling diode (50) is connected with the first inductor (21) or an external load.
7. The non-isolated driver circuit of claim 6, wherein: the circuit further comprises an absorption circuit (60), one end of the absorption circuit (60) is connected with the switch unit (10), and the other end of the absorption circuit (60) is connected with an external load.
8. The non-isolated driver circuit of claim 7, wherein: the absorption circuit (60) comprises an absorption capacitor (61) and an absorption resistor (62), wherein the absorption capacitor (61) is connected with the absorption resistor (62) in parallel.
9. The non-isolated driver circuit of claim 8, wherein: the switch unit (10) comprises a switch tube Q2, and the filter unit (30) comprises a filter capacitor (31);
the input end of the switching tube Q2 is respectively connected with one end of the first inductor (21) and the anode of the freewheeling diode (50), the control end of the switching tube Q2 is connected with an external control signal, and the output end of the switching tube Q2 is connected with the cathode of an external power supply or grounded;
the cathode of the freewheeling diode (50) is connected with one end of the absorption capacitor (61) and one end of the absorption resistor (62) respectively;
the other end of the absorption resistor (62) is respectively connected with the other end of the absorption capacitor (61), the cathode of the auxiliary diode (42), an external power supply, one end of the filter capacitor (31) and the anode of an external load;
the anode of the auxiliary diode (42) is connected with one end of the second inductor (41);
and the dotted terminal of the second inductor (41) is respectively connected with the dotted terminal of the first inductor (21), the other terminal of the filter capacitor (31) and the negative electrode of an external load.
10. The non-isolated driver circuit of claim 8, wherein: the switch unit (10) comprises a switch chip U2, and the filter unit (30) comprises a filter capacitor (31);
the input end of the switch chip U1 is connected with the positive electrode of an external power supply, and the output end of the switch chip U1 is respectively connected with one end of the absorption capacitor (61), one end of the absorption resistor (62) and one end of the first inductor (21);
the other end of the absorption capacitor (61) is respectively connected with the other end of the absorption resistor (62) and the cathode of the freewheeling diode (50);
the anode of the freewheeling diode (50) is respectively connected with the anode of the auxiliary diode (42), one end of the filter capacitor (31), the cathode of an external power supply and the cathode of an external load;
the cathode of the auxiliary diode (42) is connected with one end of the second inductor (41);
and the homonymous end of the second inductor (41) is respectively connected with the homonymous end of the first inductor (21), the other end of the filter capacitor (31) and the anode of an external load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921230253.2U CN210491273U (en) | 2019-07-31 | 2019-07-31 | Non-isolated driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921230253.2U CN210491273U (en) | 2019-07-31 | 2019-07-31 | Non-isolated driving circuit |
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| Publication Number | Publication Date |
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| CN210491273U true CN210491273U (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921230253.2U Active CN210491273U (en) | 2019-07-31 | 2019-07-31 | Non-isolated driving circuit |
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| CN (1) | CN210491273U (en) |
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