CN111313673A - Drive circuit and air conditioner - Google Patents
Drive circuit and air conditioner Download PDFInfo
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- CN111313673A CN111313673A CN202010219548.0A CN202010219548A CN111313673A CN 111313673 A CN111313673 A CN 111313673A CN 202010219548 A CN202010219548 A CN 202010219548A CN 111313673 A CN111313673 A CN 111313673A
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- resistive element
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- electric quantity
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00421—Driving arrangements for parts of a vehicle air-conditioning
- B60H1/00428—Driving arrangements for parts of a vehicle air-conditioning electric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses
Abstract
The invention provides a driving circuit and an air conditioner, wherein the driving circuit comprises: the capacitive element is connected between the power supply end and the load end, is used for storing electric quantity and supplies power to the load through the load end; and the bleeder circuit is connected between the load end and the ground wire, the power supply end and the load end are in a cut-off state, and the bleeder circuit is conducted and releases the electric quantity stored by the capacitive element. Through the technical scheme of the invention, under the condition of sudden power failure or load stalling, the electric quantity stored by the capacitive element can be released in time, so that the electrical safety and reliability of the whole machine are improved.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a driving circuit and an air conditioner.
Background
At present, a large-capacity energy storage capacitor is installed on an on-vehicle air conditioner and used for providing stable voltage for a compressor and a fan, and after shutdown or power failure, the energy storage capacitor still has a large amount of charges and is dangerous to get an electric shock for maintenance personnel who disassemble the air conditioner.
Moreover, any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily known to a person of ordinary skill in the art, and any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily widely known or forms part of common general knowledge in the field.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an object of the present invention is to provide a driving circuit.
Another object of the present invention is to provide an air conditioner.
In order to achieve the above object, according to an embodiment of a first aspect of the present invention, there is provided a driving circuit including: the capacitive element is connected between the power supply end and the load end, is used for storing electric quantity and supplies power to the load through the load end; and the bleeder circuit is connected between the load end and the ground wire, the power supply end and the load end are in a cut-off state, and the bleeder circuit is conducted and releases the electric quantity stored by the capacitive element.
In the technical scheme, a booster circuit is usually arranged to supply power to a load, on one hand, the booster circuit can perform boosting processing, and on the other hand, the booster circuit stores electric energy through a capacitive element, and under the condition that the load is powered down or a power supply end is suddenly powered off, the energy stored by the capacitive element cannot be released, so that the capacitive element is provided with a bleeder circuit, and the electric quantity stored by the capacitive element is released in time, so that the electrical safety and the reliability of the whole machine are improved.
In any one of the above technical solutions, preferably, the bleeding circuit includes: the first power tube and the first resistive element are connected in series between the load end and the ground wire; the second resistive element is connected between the load end and the control end of the first power tube, the electric quantity stored by the capacitive element is conducted to the first power tube through the second resistive element, and the electric quantity stored by the capacitive element is discharged through the first resistive element and the first power tube.
In the technical scheme, the bleeder circuit comprises a first power tube, a first resistive element and a second resistive element, the first power tube is connected according to the above manner, the first power tube is conducted through the second resistive element, so that the electric quantity stored in the capacitive element is released through the first resistive element and the first power tube, and the bleeder speed of the electric quantity is related to the current flowing capacity of the first power tube.
For example, the first power transistor is an NPN type triode, the control terminal of the first power transistor is a base, the collector of the first power transistor is connected to the first resistive element, and the emitter of the first power transistor is connected to the ground.
In any one of the above technical solutions, preferably, the bleeding circuit further includes: and the third resistive element is connected between the control end of the first power tube and the ground wire and used for pulling down the potential of the control end.
In the technical scheme, the third resistive element is arranged to be connected between the control end of the first power tube and the ground wire, that is, the potential of the control end is pulled down, so that the stable state of the control end of the first power tube is ensured.
In any of the above technical solutions, preferably, the method further includes: the switch circuit is connected between the power supply end and the control end of the first power tube, the power supply end is in a cut-off state, the switch circuit is cut off, the electric quantity stored by the capacitive element is conducted by the second resistive element to the first power tube, and the electric quantity stored by the capacitive element is discharged by the first resistive element and the first power tube.
In the technical scheme, a switch circuit is arranged between the power supply end and the control end of the first power tube, when the power supply end is in a cut-off state, the switch circuit is cut off due to the fact that a power supply signal is lost, the electric quantity stored in the capacitive element is conducted on the first power tube through the second resistive element, and the electric quantity stored in the capacitive element is discharged through the first resistive element and the first power tube, so that the rate and the reliability of the discharge quantity of the capacitive element are further improved.
In any one of the above technical solutions, preferably, the switching circuit includes: a second power transistor connected in parallel with the third resistive element; the fourth resistive element is connected between the control end and the power supply end of the second power tube and used for carrying out current-limiting protection on the second power tube; and the fifth resistive element is connected between the control end of the second power tube and the ground wire and used for performing pull-down processing on the second power tube, wherein the power supply end and the load end are cut off, the second power tube is cut off, the electric quantity stored by the capacitive element is conducted by the second resistive element to the first power tube, and the electric quantity stored by the capacitive element is discharged by the first resistive element and the first power tube.
In the technical scheme, the switching circuit comprises a second power tube, a fourth resistive element and a fifth resistive element, and the switching circuit is connected in the above manner, when the power supply end is cut off, the fourth resistive element and the fifth resistive element have no current, the second power tube is in a cut-off state, the potential of the capacitive element controls the conduction of the first power tube through the second resistive element, and the electric quantity of the capacitive element is released through the first resistive element and the first power tube.
For example, the second power transistor is an NPN type triode, the control terminal of the second power transistor is a base, the collector of the second power transistor is connected to the control terminal of the first power transistor, and the emitter of the second power transistor is connected to the ground.
In any one of the above technical solutions, preferably, the switching circuit includes: the utility model provides a power supply device, optical coupling switch's illuminator connect in the feed end, optical coupling switch's photic ware with the resistive element of third is parallelly connected, wherein, the feed end with the load end is ended, optical coupling switch ends, the electric quantity of capacitive element storage is through the resistive element of second switches on first power tube, the electric quantity of capacitive element storage is through first resistive element with first power tube releases.
In this technical scheme, including the optical coupling switch through setting up the switch circuit, when the feeder ear input electric energy to the illuminator, the illuminator triggers the photic ware and switches on, correspondingly, if the feeder ear is ended, then the photic ware is ended, also promptly the optical coupling switch is ended, consequently, the electric quantity of capacitive element storage is through the second is hindered resistive element and is switched on first power tube, the electric quantity of capacitive element storage is through first is hindered element with first power tube is released.
In any of the above technical solutions, preferably, the method further includes: and the sixth resistive element is connected between the power supply end and the input end of the light emitter and used for carrying out current-limiting protection on the optical coupling switch.
In the technical scheme, the sixth resistive element is connected between the power supply end and the input end of the light emitter, so that the current-limiting protection is performed on the optocoupler switch, and the reliability and the electrical safety of the driving circuit are further improved.
In any of the above solutions, preferably, the capacitive element includes an electrolytic capacitor, and/or a plurality of capacitors connected in series or in parallel.
In any of the above technical solutions, preferably, the first power transistor includes an insulated gate bipolar transistor and/or a triode, and the second power transistor includes the insulated gate bipolar transistor and/or the triode.
According to a second aspect of the present invention, there is provided an air conditioner comprising: a load; the driving circuit according to any one of the above technical solutions, the driving circuit being connected to the load and driving the load to operate, wherein the load includes a fan load and/or a compressor load.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic diagram of a driver circuit according to an embodiment of the invention;
FIG. 2 shows a schematic diagram of a driver circuit according to another embodiment of the invention;
FIG. 3 illustrates a schematic block diagram of an air conditioner according to an embodiment of the present invention;
fig. 4 shows a timing diagram of the amount of discharge of the driving circuit according to an embodiment of the present invention.
The correspondence between the structure names and reference numerals in fig. 1 to 4 is as follows:
the load terminal P +, the power supply terminal E +, the first power tube Q1, the second power tube Q2, the first resistive element R1, the second resistive element R2, the third resistive element R3, the fourth resistive element R4, the fifth resistive element R5, the sixth resistive element R6, the ground GND, the light emitter D, and the light receiver T.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Embodiments of a driving circuit and an air conditioner according to embodiments of the present invention are specifically described below with reference to fig. 1 to 4.
As shown in fig. 1, a driving circuit according to an embodiment of the present invention includes: the capacitive element is connected between the power supply end and the load end P +, is used for storing electric quantity and supplies power to the load through the load end P +; and the bleeder circuit is connected between the load end P + and the ground wire GND, the power supply end and the load end P + are in a cut-off state, and the bleeder circuit is switched on and releases the electric quantity stored by the capacitive element.
In the technical scheme, a booster circuit is usually arranged to supply power to a load, on one hand, the booster circuit can perform boosting processing, and on the other hand, the booster circuit stores electric energy through a capacitive element, and under the condition that the load is powered down or a power supply end E + is suddenly powered off, the energy stored by the capacitive element cannot be released, so that the capacitive element is provided with a bleeder circuit, and the electric quantity stored by the capacitive element is released in time, so that the electrical safety and the reliability of the whole machine are improved.
In any one of the above technical solutions, preferably, the bleeding circuit includes: a first power transistor Q1 and a first resistive element R1 connected in series between the load terminal P + and the ground GND; a second resistive element R2, the second resistive element R2 connect in the load end P + with between the control end of the first power tube Q1, the electric quantity that the capacitive element stored passes through the second resistive element R2 switches on the first power tube Q1, the electric quantity that the capacitive element stored passes through the first resistive element R1 and the first power tube Q1 carries out the bleeder.
In this embodiment, the bleeder circuit includes the first power transistor Q1, the first resistive element R1, and the second resistive element R2, and is connected in the above manner, the first power transistor Q1 is turned on by the second resistive element R2, the electric quantity stored in the capacitive element is discharged through the first resistive element R1 and the first power transistor Q1, and a bleeder rate of the electric quantity is related to a current flowing capability of the first power transistor Q1.
For example, the first power transistor Q1 is an NPN type transistor, the control terminal of the first power transistor Q1 is a base, the collector of the first power transistor Q1 is connected to the first resistive element R1, and the emitter of the first power transistor Q1 is connected to the ground GND.
In any one of the above technical solutions, preferably, the bleeding circuit further includes: and the third resistive element R3 is connected between the control end of the first power tube Q1 and the ground line GND and used for pulling down the potential of the control end.
In this technical solution, the third resistive element R3 is connected between the control end of the first power transistor Q1 and the ground GND, that is, the potential of the control end is pulled down, so as to ensure that the state of the control end of the first power transistor Q1 is stable.
In any of the above technical solutions, preferably, the method further includes: the switch circuit is connected between the power supply end E + and the control end of the first power tube Q1, the power supply end E + is in the cut-off state, the switch circuit is cut off, the electric quantity stored by the capacitive element is conducted to the first power tube Q1 through the second resistive element R2, and the electric quantity stored by the capacitive element is discharged through the first resistive element R1 and the first power tube Q1.
In this technical solution, a switch circuit is connected between the power supply terminal E + and the control terminal of the first power tube Q1, when the power supply terminal E + is in an off state, the switch circuit is turned off due to a loss of a power supply signal, the electric quantity stored in the capacitive element turns on the first power tube Q1 through the second resistive element R2, and the electric quantity stored in the capacitive element is discharged through the first resistive element R1 and the first power tube Q1, so as to further improve the rate and reliability of the discharge quantity of the capacitive element.
In any one of the above technical solutions, preferably, the switching circuit includes: a second power transistor Q2, the second power transistor Q2 being connected in parallel with the third resistive element R3; the fourth resistive element R4 is connected between the control end of the second power transistor Q2 and the power supply end E +, and is used for performing current-limiting protection on the second power transistor Q2; a fifth resistive element R5 connected between the control terminal of the second power tube Q2 and the ground GND for performing pull-down processing on the second power tube Q2, wherein the power supply terminal E + and the load terminal P + are cut off, the second power tube Q2 is cut off, the electric quantity stored by the capacitive element is discharged through the first resistive element R1 and the first power tube Q1 when the second resistive element R2 is turned on the first power tube Q1.
In this embodiment, by providing a switching circuit including the second power transistor Q2, the fourth resistive element R4, and the fifth resistive element R5, and connecting the switching circuit in the above manner, when the power supply terminal E + is turned off, no current flows through both the fourth resistive element R4 and the fifth resistive element R5, the second power transistor Q2 is in an off state, the potential of the capacitive element controls the first power transistor Q1 to be turned on through the second resistive element R2, and the electric quantity of the capacitive element is discharged through the first resistive element R1 and the first power transistor Q1.
For example, the second power transistor Q2 is an NPN transistor, the control terminal of the second power transistor Q2 is a base, the collector of the second power transistor Q2 is connected to the control terminal of the first power transistor Q1, and the emitter of the second power transistor Q2 is connected to the ground GND.
As shown in fig. 2, in any of the above technical solutions, preferably, the switching circuit includes: the optical coupling switch, the illuminator D of optical coupling switch connect in the feed end E +, the photic ware T of optical coupling switch with the resistive element R3 of third is parallelly connected, wherein, the feed end E + with load end P + ends, the optical coupling switch ends, the electric quantity warp of capacitive element storage the resistive element R2 of second switches on first power tube Q1, the electric quantity warp of capacitive element storage first resistive element R1 with first power tube Q1 releases.
In this technical scheme, when setting up the switch circuit and including the opto-coupler switch, the power supply end E + is to the input electric energy of illuminator D, and illuminator D triggers the photic ware T and switches on, correspondingly, if power supply end E + cuts off, photic ware T cuts off, also promptly the opto-coupler switch cuts off, therefore, the electric quantity of capacitive element storage is through second resistive element R2 switches on first power pipe Q1, the electric quantity of capacitive element storage is through first resistive element R1 with first power pipe Q1 releases.
In any of the above technical solutions, preferably, the method further includes: and the sixth resistive element R6 is connected between the power supply end E + and the input end of the light emitter D and used for carrying out current-limiting protection on the optical coupling switch.
In the technical scheme, the sixth resistive element R6 is connected between the power supply end E + and the input end of the light emitter D, so that the optocoupler switch is subjected to current-limiting protection, and the reliability and the electrical safety of the driving circuit are further improved.
In any of the above solutions, preferably, the capacitive element includes an electrolytic capacitor, and/or a plurality of capacitors connected in series or in parallel.
In any of the above technical solutions, preferably, the first power transistor Q1 includes an insulated gate bipolar transistor and/or a triode, and the second power transistor Q2 includes the insulated gate bipolar transistor and/or the triode.
As shown in fig. 3, an air conditioner 300 according to an embodiment of the present invention includes: a load 302; the driving circuit 304 according to any of the above technical solutions, wherein the driving circuit 304 is connected to the load 302 and drives the load 302 to operate, and the load 302 includes a fan load and/or a compressor load.
As shown in fig. 4, the present invention provides a method for self-discharging an energy storage capacitor after a power failure of a vehicle-mounted air conditioner, when a power supply terminal E + inputs 24V power supply and is disconnected, the circuit can automatically and rapidly consume the power of a rear-stage energy storage capacitor to ensure the safety of maintenance personnel for disassembling the machine, and in addition, after the power supply terminal E + still has power or is shut down, the self-discharging circuit does not work, so as to avoid the waste of electric energy.
The booster circuit boosts the input voltage to 250V, when the 24V is disconnected, the second power tube Q2 is closed, the first power tube Q1 obtains energy through the second resistive element R2 and conducts, and the electric energy is quickly released through the first resistive element R1.
The fourth resistive element R4 is a current-limiting resistor of the second power transistor Q2, and the fifth resistive element R5 is a pull-down resistor, so that the pin is controlled to be pulled down and in an off state by the second power transistor Q2 after the 24V input is disconnected.
After the second power transistor Q2 is turned off, the first power transistor Q1 draws power from the energy storage capacitor through a second resistive element R2 (current limiting resistor).
The third resistive element R3 may not be installed, and the control pin of the first power transistor Q1 can be pulled down after installation, so as to ensure the stable state of the control pin of the first power transistor Q1.
Fig. 2 shows the application of the self-discharge circuit in the case of isolated boosting. When the 24V is disconnected, the optical coupling switch loses the electric energy secondary side and is closed, and the first power tube Q1 obtains electric energy conduction through the current-limiting second resistive element R2.
The electric energy is rapidly released through the first resistive element R1, and the sixth resistive element R6 is a current-limiting resistor on the primary side of the optical coupling switch, so that overcurrent damage of the optical coupling switch is avoided, and the optical coupling switch works in a normal state.
The third resistive element R3 may not be installed, and the control pin of the first power transistor Q1 can be pulled down after installation, so as to ensure the stable state of the control pin of the first power transistor Q1.
Fig. 4 is a discharge curve of the self-discharge circuit in operation, the horizontal axis is a time axis, i.e., voltage values of the capacitive element are recorded in terms of time, such as, but not limited to, 500ms and 1s, and the vertical axis is a voltage axis, and the recorded voltage values include, but are not limited to, 100V, 200V, 250V, and the like. When the input 24V is disconnected, the electricity of the energy storage capacitor can be quickly released within 1S, and the discharge speed of the charge depends on the current capacity of the first resistive element R1 and the first power tube Q1.
In summary, all technical solutions of the present invention are a method for self-discharging an energy storage capacitor after a power failure of a vehicle-mounted air conditioner. When the power supply end inputs 24V for power supply and is disconnected, the circuit can automatically and quickly consume the electricity of the rear-stage energy storage capacitor so as to ensure the safety of maintenance personnel during dismantling the machine. And the self-discharge circuit does not work after the input is still electrified or the power is turned off, so that the waste of electric energy is avoided.
The technical scheme of the invention is described in detail above with reference to the accompanying drawings, and the invention provides a driving circuit and an air conditioner, wherein a boost circuit is generally arranged to supply power to a load, on one hand, the boost circuit can perform boost processing, on the other hand, the boost circuit stores electric energy by arranging a capacitive element, and under the condition that the load is powered off or a power supply end is suddenly powered off, the energy stored by the capacitive element cannot be released, so that the electrical safety and reliability of the whole machine are improved by arranging a bleeder circuit for the capacitive element and releasing the electric quantity stored by the capacitive element in time.
The steps in the method of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the device of the invention can be merged, divided and deleted according to actual needs.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by instructions associated with a program, which may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), compact disc-Read-Only Memory (CD-ROM), or other Memory, magnetic disk, magnetic tape, or magnetic tape, Or any other medium which can be used to carry or store data and which can be read by a computer.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A driver circuit, comprising:
the capacitive element is connected between the power supply end and the load end, is used for storing electric quantity and supplies power to the load through the load end;
and the bleeder circuit is connected between the load end and the ground wire, the power supply end and the load end are in a cut-off state, and the bleeder circuit is conducted and releases the electric quantity stored by the capacitive element.
2. The driver circuit of claim 1, wherein the bleeding circuit comprises:
the first power tube and the first resistive element are connected in series between the load end and the ground wire;
the second resistive element is connected between the load end and the control end of the first power tube, the electric quantity stored by the capacitive element is conducted to the first power tube through the second resistive element, and the electric quantity stored by the capacitive element is discharged through the first resistive element and the first power tube.
3. The driver circuit of claim 2, wherein the bleeding circuit further comprises:
and the third resistive element is connected between the control end of the first power tube and the ground wire and used for pulling down the potential of the control end.
4. The drive circuit according to claim 3, further comprising:
the switch circuit is connected between the power supply end and the control end of the first power tube, the power supply end is in a cut-off state, the switch circuit is cut off, the electric quantity stored by the capacitive element is conducted by the second resistive element to the first power tube, and the electric quantity stored by the capacitive element is discharged by the first resistive element and the first power tube.
5. The drive circuit according to claim 4, wherein the switching circuit comprises:
a second power transistor connected in parallel with the third resistive element;
the fourth resistive element is connected between the control end and the power supply end of the second power tube and used for carrying out current-limiting protection on the second power tube;
a fifth resistive element connected between the control end of the second power tube and the ground wire for performing pull-down processing on the second power tube,
the power supply end and the load end are cut off, the second power tube is cut off, the electric quantity stored by the capacitive element is conducted to the first power tube through the second resistive element, and the electric quantity stored by the capacitive element is discharged through the first resistive element and the first power tube.
6. The drive circuit according to claim 4, wherein the switching circuit comprises:
an optical coupling switch, a light emitter of which is connected with the power supply end, a light receiver of which is connected with the third resistive element in parallel,
the power supply end and the load end are cut off, the optical coupling switch is cut off, the electric quantity stored by the capacitive element is conducted by the second resistive element to the first power tube, and the electric quantity stored by the capacitive element is discharged by the first resistive element and the first power tube.
7. The driving circuit according to claim 6, further comprising:
and the sixth resistive element is connected between the power supply end and the input end of the light emitter and used for carrying out current-limiting protection on the optical coupling switch.
8. The drive circuit according to any one of claims 1 to 7,
the capacitive element comprises an electrolytic capacitor and/or a plurality of capacitors connected in series or in parallel.
9. The drive circuit according to any one of claims 5 to 7,
the first power tube comprises an insulated gate bipolar transistor and/or a triode, and the second power tube comprises the insulated gate bipolar transistor and/or the triode.
10. An air conditioner, comprising:
a load;
the driving circuit according to any one of claims 1 to 9, connected to the load and driving the load to operate,
wherein the load comprises a fan load and/or a compressor load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010219548.0A CN111313673A (en) | 2020-03-25 | 2020-03-25 | Drive circuit and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010219548.0A CN111313673A (en) | 2020-03-25 | 2020-03-25 | Drive circuit and air conditioner |
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| CN111313673A true CN111313673A (en) | 2020-06-19 |
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| KR20130080943A (en) * | 2012-01-06 | 2013-07-16 | 현대모비스 주식회사 | Discharging circuit of input unit for large capacity inverter |
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| CN207410027U (en) * | 2017-10-31 | 2018-05-25 | 杭州之山智控技术有限公司 | Busbar voltage leadage circuit |
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Application publication date: 20200619 |