CN110601531A - Power supply control circuit and vehicle-mounted air conditioner - Google Patents

Power supply control circuit and vehicle-mounted air conditioner Download PDF

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Publication number
CN110601531A
CN110601531A CN201911053527.XA CN201911053527A CN110601531A CN 110601531 A CN110601531 A CN 110601531A CN 201911053527 A CN201911053527 A CN 201911053527A CN 110601531 A CN110601531 A CN 110601531A
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CN
China
Prior art keywords
voltage
switching
capacitor
power supply
diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911053527.XA
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Chinese (zh)
Inventor
霍兆镜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GD Midea Air Conditioning Equipment Co Ltd
Original Assignee
Guangdong Midea Refrigeration Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Midea Refrigeration Equipment Co Ltd filed Critical Guangdong Midea Refrigeration Equipment Co Ltd
Priority to CN201911053527.XA priority Critical patent/CN110601531A/en
Publication of CN110601531A publication Critical patent/CN110601531A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60HARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00Electric 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
    • B60R16/02Electric 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
    • B60R16/03Electric 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
    • B60R16/033Electric 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 characterised by the use of electrical cells or batteries
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/1552Boost converters exploiting the leakage inductance of a transformer or of an alternator as boost inductor

Abstract

The invention provides a power supply control circuit and a vehicle-mounted air conditioner. Wherein, power supply control circuit includes: the boost circuit, boost circuit are configured to be treated the power supply voltage who inputs to the load and carry out voltage conversion, and boost circuit includes specifically: the voltage-multiplying component is configured to store or release a power supply voltage provided by the input end of the booster circuit, wherein the voltage-multiplying components are arranged in at least two groups, and the at least two groups of voltage-multiplying components are connected with each other. The power supply control circuit provided by the invention realizes the energy absorption capacity of a parabolic load, saves a voltage suppression circuit, avoids additional cost caused by adding devices, and can efficiently raise the input voltage by fully utilizing the absorption capacity to provide electric energy for subsequent loads, thereby solving the problem caused by adopting a low-voltage driving load.

Description

Power supply control circuit and vehicle-mounted air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a power supply control circuit and a vehicle-mounted air conditioner.
Background
At present, a vehicle-mounted battery powered air conditioner in a gasoline vehicle directly adopts a battery to drive the air conditioner, a compressor in the air conditioner also adopts battery voltage to drive the air conditioner to operate, but the battery voltage is adopted to directly drive the compressor, the compressor needs to be wound by using a very thick copper wire, the manufacturing cost of the compressor and the size of the compressor are large, the compressor is not beneficial to production and use, a load throwing voltage exists in the vehicle, the highest value of the load throwing voltage is 5-10 times of the battery voltage, if a power supply circuit is connected with an inverter circuit, the compression resistance requirement on the inverter circuit is high, and a voltage suppression circuit is required to be adopted for protection.
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, a first aspect of the present invention provides a power supply control circuit.
A second aspect of the present invention is to provide a vehicle air conditioner.
In view of the above, according to a first aspect of the present invention, a power supply control circuit is provided, including: the boost circuit, boost circuit are configured to be treated the power supply voltage who inputs to the load and carry out voltage conversion, and boost circuit includes specifically: the voltage-multiplying component is configured to store or release a power supply voltage provided by the input end of the booster circuit, wherein the voltage-multiplying components are arranged in at least two groups, and the at least two groups of voltage-multiplying components are connected with each other.
The power supply control circuit provided by the invention considers that the storage battery of the automobile is charged by the generator of the automobile, when the generator is suddenly disconnected from the generator in the running process, the generator serving as an inductive device causes voltage compensation under the condition of current reduction to maintain the current unchanged, the voltage of the generator rises instantly, and if the electric appliance mounted on the generator has no capacity to consume the energy, the electric appliance is damaged. Therefore, the booster circuit absorbs the overhigh voltage, when the power supply control circuit works, the current can be stored in the multiple voltage doubling assemblies and is finally transferred to the energy storage assembly to be used by a load, on one hand, the energy absorption capacity of the load can be realized, the voltage suppression circuit is omitted, the extra cost caused by the increase of devices is avoided, on the other hand, the absorption capacity can be fully utilized, the input voltage can be efficiently increased, the electric energy is provided for the subsequent load, and the problem caused by the adoption of the low-voltage driving load is solved.
In addition, according to the power supply control circuit in the above technical solution provided by the present invention, the following additional technical features may be further provided:
in any one of the above technical solutions, further, the voltage boost circuit further includes: the switching device is connected with the voltage-multiplying component and is configured to control the voltage-multiplying component to be switched on or switched off; the energy storage subassembly, the one end and the voltage doubling subassembly of energy storage subassembly are connected, and the other end and the output of boost circuit of energy storage subassembly are connected, and the energy storage subassembly is configured to transmit the output to boost circuit after the power supply voltage boost conversion of voltage doubling subassembly release.
In this technical scheme, switching device and voltage doubling subassembly are connected for control voltage doubling subassembly switches on or cuts off, every a set of in the multiunit voltage doubling subassembly all corresponds a switching device, and a plurality of switching device work in turn, when switching device switches on, the electric energy of power supply control circuit input can be stored in voltage doubling subassembly, when switching device cuts off, voltage doubling subassembly release stored electric energy to energy storage subassembly, so that energy storage subassembly superposes the electric energy, thereby realize supply voltage's the conversion that steps up.
In any of the above technical solutions, further, the voltage doubling assembly includes a first voltage doubling assembly and a second voltage doubling assembly; the first voltage doubling component comprises a first inductor, a first capacitor and a first diode; the second voltage-multiplying component comprises a second inductor, a second capacitor and a second diode; the common end between the first inductor and the second inductor is connected to the input end of the booster circuit; one end of the first capacitor is connected to the first inductor, and the other end of the first capacitor is connected to the second inductor through the second diode; one end of the second capacitor is connected to the second inductor, and the other end of the second capacitor is connected to the first inductor through the first diode.
In the technical scheme, each group of voltage doubling components comprises an inductor, a capacitor and a diode, wherein a first inductor and a second inductor are connected to an input end of a booster circuit to store electric energy at the input end, one end of the first capacitor is connected to the first inductor, the other end of the first capacitor is connected to the second inductor through a second diode, one end of the second capacitor is connected to the second inductor, the other end of the second capacitor is connected to the first inductor through a first diode to realize the mutual connection of the first voltage doubling component and the second voltage doubling component, when the first inductor releases electric energy, a part of electric energy flows into the energy storage component, a part of electric energy flows into the second capacitor through the first diode, similarly, when the second inductor releases electric energy, a part of electric energy flows into the energy storage component, a part of electric energy flows into the first capacitor through the second diode, and the capacitor which stores electric energy can also release electric energy to the energy storage component, therefore, the switching loss is reduced, and the circuit conversion efficiency is improved.
In any of the above technical solutions, further, the switching device includes a first switching device and a second switching device; the first switch device is connected to a common terminal between the first capacitor and the first inductor; the second switching device is connected to a common terminal between the second capacitor and the second inductor.
In the technical scheme, the output voltage of the boosting circuit is controlled by changing the switching frequency of the first switching device and the second switching device, so that the boosting function is realized.
In any of the above technical solutions, further, the energy storage component includes a third diode and an electrolytic capacitor connected in series; the third diode is connected to the common terminal between the first capacitor and the second capacitor; the common terminal among the electrolytic capacitor, the first switching device and the second switching device is connected to the output terminal of the booster circuit.
In the technical scheme, the energy storage assembly comprises a third diode and an electrolytic capacitor which are connected in series, and electric energy released by the inductor and/or the capacitor is transmitted into the electrolytic capacitor, so that the output voltage of the booster circuit is boosted, and the boosting stability is ensured by the third diode.
In any of the above technical solutions, further, the first switching device is turned on, and the input terminal of the voltage boost circuit charges the first inductor; the second switch device is conducted, and the input end of the booster circuit charges the second inductor; the first switch device is turned off, the second switch device is turned on, and the first inductor discharges to the electrolytic capacitor through the first capacitor and the third diode and discharges to the second capacitor through the first diode; the second switch device is turned off, the first switch device is turned on, and the second inductor discharges to the electrolytic capacitor through the second capacitor and the third diode and discharges to the first capacitor through the second diode; the first switch device and the second switch device are both turned off, the first inductor discharges to the electrolytic capacitor through the first diode and the third diode, and the second inductor discharges to the electrolytic capacitor through the second diode and the third diode.
In the technical scheme, when the booster circuit works, the switching device works according to a certain duty ratio, the duty ratio is determined according to the voltage required to be output by the booster circuit, when the first switching device is switched on, the voltage at the input end of the booster circuit is loaded at two ends of the first inductor, the current of the first inductor starts to rise, and the electric energy is stored in the first inductor; when the second switch device is conducted, the voltage at the input end of the booster circuit is loaded at two ends of the second inductor, the current of the second inductor starts to rise, and the electric energy is stored in the second inductor; when the first switch device is turned off and the second switch device is turned on, the energy stored in the first inductor starts to be released, two release paths are provided, one is to discharge to the electrolytic capacitor through the first capacitor and the third diode, the other is to reach the second capacitor through the first diode, and one end of the second capacitor is connected with the ground end due to the turn-on of the second switch device, namely the potential of the end is 0V, namely the voltage at two ends of the second capacitor is consistent with the voltage loaded on the second switch device; when the second switch device is turned off and the first switch device is turned on, the energy stored in the second inductor begins to be released, two release paths are provided, one is to discharge to the electrolytic capacitor through the second capacitor and the third diode, the other is to reach the first capacitor through the second diode, and one end of the first capacitor is connected with the ground end due to the turn-on of the first switch device, namely the potential of the end is 0V, namely the voltage at two ends of the first capacitor is consistent with the voltage loaded on the first switch device, furthermore, because the second capacitor stores the electric energy released by the first inductor, the voltage loaded at two ends of the second switch device is the difference between the output voltage of the booster circuit and the voltage at two ends of the second capacitor, thereby reducing the voltage loaded at two ends of the second switch device, and enabling the booster circuit to use the switch device bearing the voltage lower than the input voltage or to take the same price, but the switching element with more excellent performance improves the circuit conversion efficiency and can effectively reduce the cost while realizing the boost conversion of the booster circuit.
Similarly, after the first capacitor stores the electric energy released by the second inductor, the first switching device is turned off again, and the voltage loaded across the first switching device is the difference between the output voltage of the boost circuit and the voltage across the first capacitor, so that the voltage loaded across the first switching device is reduced.
Further, when the booster circuit stops working, the first switching device and the second switching device are both cut off, and the power supply voltage at the input end of the booster circuit reaches the electrolytic capacitor through the first inductor, the first diode and the third diode and reaches the electrolytic capacitor through the second inductor, the second diode and the third diode.
In any one of the above technical solutions, further, the voltage boost circuit further includes: a zener diode connected in parallel with the switching device, the zener diode configured to filter voltage fluctuations during operation of the switching device.
In this solution, when the circuit suddenly turns off the switching device during a heavy load, the energy in the first inductor will flow through two paths: through the first capacitor to the third diode and through the first diode to the second capacitor; the energy on the second inductor will flow through two paths: through the second capacitor to the third diode and the second diode to the first capacitor. If the energy of the inductor is large, the voltage on the first capacitor and the voltage on the second capacitor are increased to the output voltage, at the moment, the low-voltage switching device cannot bear the damage phenomenon caused by the overhigh electric energy, and the voltage stabilizing diodes are connected in parallel at the two ends of the switching device, so that the energy of the voltage exceeding the voltage resistance part of the switching device can be absorbed, and the switching device is protected.
In any of the above technical solutions, further, the switching device includes at least one of a metal oxide semiconductor field effect transistor, an insulated gate bipolar transistor, and a diode, where a gate of the metal oxide semiconductor field effect transistor is connected to the command output terminal, a reverse freewheel diode is connected between a source and a drain of the metal oxide semiconductor field effect transistor, a base of the insulated gate bipolar transistor is connected to the command output terminal, and a reverse freewheel diode is connected between an emitter and a collector of the insulated gate bipolar transistor.
In the technical solution, the first switch device and the second switch device have the same structure, and in practical application, the first switch device and the second switch device may have multiple options, for example, an IGBT (Insulated Gate bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor field effect Transistor) may be used. When the IGBT is adopted, each switching device comprises a triode and a diode, the collector of the triode is connected with the cathode of the diode to form the first end of the switching device, and the emitter of the triode is connected with the anode of the diode to form the second end of the switching device; when the MOSFET is adopted, each switching device comprises an MOS tube and a diode, the source electrode of the MOS tube is connected with the cathode of the diode to form a first end of the switching device, and the drain electrode of the MOS tube is connected with the anode of the diode to form a second end of the switching device.
In any of the above technical solutions, further, the capacitance range of the electrolytic capacitor includes 10uF to 2000 uF.
In any of the above technical solutions, further, the method further includes: a power supply configured to provide a supply voltage; the inverter circuit is configured to control the power supply signal to supply power to the load according to the converted voltage; the controller is configured to output a control instruction and control the booster circuit to work according to a preset switching frequency and a preset duty ratio; the power supply, the inverter circuit and the controller are connected with the booster circuit.
In the technical scheme, electric energy is provided for a load through a power supply, specifically, the power supply voltage of the power supply is boosted through a booster circuit to obtain direct current high voltage, and then the direct current high voltage is provided for a high-voltage load in equipment; if the load is a compressor, the compressor is a direct current synchronous motor, so an inverter circuit is required to be adopted for driving; the controller is connected with a switching device in the booster circuit to control the booster circuit to work according to the preset switching frequency and the preset duty ratio.
Specifically, the power supply voltage of the power supply is any one of: 12V, 24V and 48V, and the booster circuit can boost the direct current of 12V, 24V and 48V to 200V to 300V direct current so as to provide the direct current for the high-voltage direct current load.
According to a second aspect of the present invention, a vehicle air conditioner is provided, which includes a load and the power supply control circuit of any one of the above, the power supply control circuit being connected to the load, the power supply control circuit being configured to control a power supply signal to supply power to the load. Therefore, the vehicle air conditioner has all the advantages of the power supply control circuit.
Further, the load is a fan and/or a compressor.
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 is a schematic diagram of a power supply control circuit according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a power supply control circuit according to another embodiment of the present invention;
FIG. 3 illustrates a power control circuit configuration diagram of one embodiment of the present invention;
fig. 4 shows a waveform diagram of a duty cycle of a switching device in a power supply control circuit according to an embodiment of the invention.
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 of the present invention and features of the embodiments 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 to the specific embodiments disclosed below.
Example one
As shown in fig. 1, according to an embodiment of the first aspect of the present invention, a power supply control circuit 100 is provided, the circuit comprising: the booster circuit 102 converts a supply voltage to be input to a load.
Specifically, the voltage-multiplying component 102 includes a voltage-multiplying component 1022, and the voltage-multiplying component 1022 is configured to store or release a supply voltage provided by an input terminal of the voltage-multiplying component 102, wherein at least two groups of the voltage-multiplying components 1022 are provided, and at least two groups of the voltage-multiplying components 1022 are connected to each other.
In the power supply control circuit 100 according to this embodiment, when the battery of the vehicle is charged by the generator of the vehicle, and the generator as an inductive device causes voltage compensation to maintain a constant current when the current drops when the battery is suddenly disconnected from the generator during the operation of the generator, the voltage of the generator may rise instantaneously, and if the electrical appliance mounted on the generator cannot consume the energy, the electrical appliance may be damaged. Therefore, the boost circuit 102 absorbs the excessively high voltage, when the power supply control circuit 100 works, the current is stored in the multiple voltage doubling components 1022 and is finally transferred to the energy storage component 1026 to be used by a load, on one hand, the energy absorption capability of the load is realized, the voltage suppression circuit is omitted, the extra cost caused by the increase of devices is avoided, on the other hand, the absorption capability can be fully utilized, the input voltage is efficiently increased, the electric energy is provided for the subsequent load, and the problem caused by the adoption of the low-voltage driving load is solved.
Example two
As shown in fig. 1, according to an embodiment of the present invention, in addition to the features defined in the above embodiment, further: the boost circuit 102 also includes a switching device 1024 and a storage component 1026.
Specifically, the switching device 1024 is connected to the voltage-multiplying component 1022, and is configured to control the voltage-multiplying component 1022 to turn on or off, one end of the energy storage component 1026 is connected to the voltage-multiplying component 1022, the other end of the energy storage component 1026 is connected to the output end of the voltage boost circuit 102, and the energy storage component 1026 is configured to boost and convert the supply voltage released by the voltage-multiplying component 1022 and transmit the converted supply voltage to the output end of the voltage boost circuit 102.
In this embodiment, the switching device 1024 is connected to the voltage doubling component 1022 and is used for controlling the voltage doubling component 1022 to be turned on or turned off, each of the multiple sets of voltage doubling components 1022 corresponds to one switching device 1024, and the multiple switching devices 1024 alternately operate, when the switching devices 1024 are turned on, the electric energy at the input end of the power supply control circuit 100 is stored in the voltage doubling component 1022, and when the switching devices 1024 are turned off, the voltage doubling component 1022 releases the stored electric energy to the energy storage component 1026, so that the energy storage component 1026 superposes the electric energy, thereby implementing the voltage boosting conversion of the power supply voltage.
EXAMPLE III
As shown in fig. 1 and 2, according to an embodiment of the present invention, there is provided a power supply control circuit 100, including: a boost circuit 102, a power supply 104, an inverter circuit 106, and a controller 108.
Specifically, the power source 104, the inverter circuit 106, and the controller 108 are connected to the voltage boost circuit 102, the power source 104 is configured to provide a supply voltage, the inverter circuit 106 is configured to control a supply signal according to the converted voltage to supply power to a load, and the controller 108 is configured to output a control command and control the voltage boost circuit 102 to operate according to a preset switching frequency and a preset duty ratio.
In this embodiment, the power supply 104 provides power to the load, specifically, the boost circuit 102 boosts the power supply voltage of the power supply 104 to obtain a dc high voltage, which is then provided to the high-voltage load in the device; if the load is a compressor, the compressor is a direct current synchronous motor, so the inverter circuit 106 is required to be used for driving; the controller 108 is connected to the switching device 1024 of the voltage boost circuit 102 to control the voltage boost circuit 102 to operate according to a preset switching frequency and duty cycle.
Specifically, the supply voltage of the power supply 104 is any one of: 12V, 24V and 48V, the booster circuit 102 can boost the direct current of 12V, 24V and 48V to direct current of 200V-300V, thereby providing the direct current for the high-voltage direct current load.
Example four
As shown in fig. 1 and 3, according to an embodiment of the present invention, there is provided a power supply control circuit 100, including: the boost circuit 102, the boost circuit 102 includes: voltage doubler component 1022, switching device 1024, and energy storage component 1026.
Specifically, the voltage doubling assembly 1022 includes a first voltage doubling assembly 1022 and a second voltage doubling assembly 1022; the first voltage doubling component 1022 includes a first inductor L1, a first capacitor C1, and a first diode D1; the second voltage doubling component 1022 includes a second inductor L2, a second capacitor C2, and a second diode D2; the common terminal between the first inductor L1 and the second inductor L2 is connected to the input terminal of the voltage boost circuit 102; one end of the first capacitor C1 is connected to the first inductor L1, and the other end of the first capacitor C1 is connected to the second inductor L2 through the second diode D2; one end of a second capacitor C2 is connected to the second inductor L2, and the other end of the second capacitor C2 is connected to the first inductor L1 through a first diode D1; the switching device 1024 includes a first switching device Q1 and a second switching device Q2; the first switching device Q1 is connected to the common terminal between the first capacitor C1 and the first inductor L1; the second switching device Q2 is connected to the common terminal between the second capacitor C2 and the second inductor L2; the energy storage component 1026 includes a third diode D3 and an electrolytic capacitor E connected in series; the third diode D3 is connected to the common terminal between the first capacitor C1 and the second capacitor C2; a common terminal between the electrolytic capacitor E, the first switching device Q1, and the second switching device Q2 is connected to the output terminal of the voltage-boosting circuit 102.
Further, the first switching device Q1 is turned on, and the input terminal of the voltage boost circuit 102 charges the first inductor L1; the second switching device Q2 is turned on, and the input terminal of the voltage boost circuit 102 charges the second inductor L2; the first switching device Q1 is turned off and the second switching device Q2 is turned on, the first inductor L1 discharges to the electrolytic capacitor E through the first capacitor C1 and the third diode D3, and discharges to the second capacitor C2 through the first diode D1; the second switching device Q2 is turned off and the first switching device Q1 is turned on, and the second inductor L2 discharges to the electrolytic capacitor E through the second capacitor C2 and the third diode D3 and to the first capacitor C1 through the second diode D2.
In this embodiment, when the first switching device Q1 is turned on, the voltage at the input terminal of the voltage boost circuit 102 is applied across the first inductor L1, the current of the first inductor L1 starts to rise, and the electric energy is stored in the first inductor L1; when the second switching device Q2 is turned on, the voltage at the input terminal of the voltage boost circuit 102 is loaded across the second inductor L2, the current of the second inductor L2 starts to rise, and the electric energy is stored in the second inductor L2; when the first switching device Q1 is turned off and the second switching device Q2 is turned on, the energy stored in the first inductor L1 starts to be discharged, and there are two discharging paths, one is to discharge to the electrolytic capacitor E through the first capacitor C1 and the third diode D3, and the other is to reach the second capacitor C2 through the first diode D1, and since the second switching device Q2 is turned on, one end of the second capacitor C2 is connected to the ground, that is, the potential of the end is 0V, that is, the voltage across the second capacitor C2 is equal to the voltage loaded on the second switching device Q2; when the second switching device Q2 is turned off and the first switching device Q1 is turned on, the energy stored in the second inductor L2 starts to be discharged, and there are two discharging paths, one discharging to the electrolytic capacitor E through the second capacitor C2 and the third diode D3, the other discharging path reaching the first capacitor C1 through the second diode D2, and since the first switching device Q1 is turned on, one end of the first capacitor C1 is connected to ground, that is, the potential of the end is 0V, that is, the voltage across the first capacitor C1 is the same as the voltage applied to the first switching device Q1, further, since the second capacitor C2 already stores the electric energy released by the first inductor L1, the voltage applied across the second switching device Q2 is the difference between the output voltage of the boosting circuit 102 and the voltage across the second capacitor C48, thereby reducing the voltage applied across the second switching device Q2, and similarly, after the first capacitor C2 9 stores the electric energy stored in the second inductor L582, when the first switching device Q1 is turned off again, the voltage applied across the first switching device Q1 is the difference between the output voltage of the voltage boost circuit 102 and the voltage across the first capacitor C1, so that the voltage applied across the first switching device Q1 is reduced, and the voltage boost circuit 102 can use a switching device 1024 with a lower voltage than the input voltage or a switching device 1024 with the same price but better performance, thereby achieving the voltage boost conversion of the voltage boost circuit 102, improving the circuit conversion efficiency, and effectively reducing the cost.
Further, when the booster circuit 102 stops operating, the first switching device Q1 and the second switching device Q2 are both turned off, and the supply voltage at the input terminal of the booster circuit 102 reaches the electrolytic capacitor E through the first inductor L1, the first diode D1, and the third diode D3, and reaches the electrolytic capacitor E through the second inductor L2, the second diode D2, and the third diode D3.
Specifically, the first switching device Q1 and the second switching device Q2 have the same structure, and in practical applications, the first switching device Q1 and the second switching device Q2 may have various options, such as an IGBT (Insulated Gate bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor field effect Transistor). When the IGBT is used, each switching device 1024 includes a triode and a diode, a collector of the triode is connected to a cathode of the diode to form a first end of the switching device 1024, and an emitter of the triode is connected to an anode of the diode to form a second end of the switching device 1024; when MOSFETs are used, each of the switching devices 1024 includes a MOS transistor and a diode, the source of the MOS transistor is connected to the cathode of the diode to form a first terminal of the switching device 1024, and the drain of the MOS transistor is connected to the anode of the diode to form a second terminal of the switching device 1024. The embodiment of the present invention is illustrated in fig. 3 by taking a MOSFET as an example. The capacitance value range of the electrolytic capacitor E comprises 10uF to 2000 uF.
EXAMPLE five
As shown in fig. 3, according to an embodiment of the present invention, in addition to the features defined in any of the above embodiments, the voltage boost circuit 102 further includes: a zener diode 1028 connected in parallel with the switching device 1024, the zener diode 1028 configured to filter out voltage fluctuations during operation of the switching device 1024.
Specifically, zener diode 1028 includes: a first zener diode DZ1 connected in parallel with the first switching device Q1, and a second zener diode DZ2 connected in parallel with the second switching device Q2.
In this embodiment, when the circuit suddenly turns off the switching device 1024 during a heavy load, the energy on the first inductor L1 will flow through two paths: through the first capacitor C1 to the third diode D3 and through the first diode D1 to the second capacitor C2; the energy on the second inductance L2 will flow through two paths: through the second capacitor C2 to the third diode D3 and the second diode D2 to the first capacitor C1. If the inductance energy is large, the voltages of the first capacitor C1 and the second capacitor C2 are raised to the output voltage, and at this time, the low-voltage switching device 1024 cannot bear the damage phenomenon caused by the excessively high electric energy, and the zener diode 1028 in the switching device 1024 can absorb the energy of the voltage exceeding the withstand voltage of the switching device 1024, so that the switching device 1024 is protected.
EXAMPLE six
According to an embodiment of the present invention, as shown in fig. 3, a power supply control circuit is provided for supplying power to a load after boosting, a compressor is used as a load, a power supply adopts 24V voltage, in fig. 3, a MOSFET is used as an external switching device, two switching devices (switching tubes) operate in an alternating manner, and a driving manner is shown in fig. 4.
Specifically, at time t1, when the switching transistor Q1 is turned on, the input voltage is applied across the inductor L1, the current through the inductor L1 starts to rise, and the electric energy is stored in the inductor L1.
At time t2, the switch Q2 is turned on, voltage is applied across the inductor L2, current through the inductor L2 begins to rise, and electrical energy is stored in the inductor L2.
At time t3, the switch Q1 is turned off, the energy stored in the inductor L1 starts to be released, and there are two release paths, one is to the electrolytic capacitor E1 through the capacitor C1 and the diode D3, and the other is to the capacitor C2 through the diode D1, at this time, the switch Q2 is turned on, so the pin 2 of the capacitor C2 is connected to GND, that is, the potential on the pin 2 is 0V, that is, the voltage U across the capacitor is the voltage U across the capacitorC2In accordance with the voltage applied to the switching tube Q1.
At time t4, the switching tube Q1 is turned on, the input voltage continues to be applied across the inductor L1, and the electrical energy is again stored in the inductor L1.
t5At the moment, the switching tube Q2 is turned off, and the energy stored in the inductor L2 starts to be released, and two release paths are provided, one is from the capacitor C2 and the diode D3 to the electrolytic capacitor E, and the other is from the diode D2 to the capacitor C1. At this time, the capacitor C2 outputs the set voltage U (the output voltage of the booster circuit) because the electric energy is already stored at time t3EThe voltage U is applied across the switch tube Q2DS2=UE-UC2I.e. the voltage across the switching tube Q2 will decrease.
At time t6, the switch Q2 is turned on, voltage is applied across the inductor L2, current through the inductor L2 begins to rise, and electrical energy is stored in the inductor L2.
At time t7, switch Q1 is turned off, and the energy stored in inductor L1 begins to be discharged, and there are two discharge paths, one is through capacitor C1 and diode D3 to electrolytic capacitor E, and one is through diode D1 to capacitor C2. At this time, the capacitor C1 outputs the set voltage U (the output voltage of the booster circuit) because the electric energy is already stored at time t5EThe voltage U is applied across the switch tube Q1DS1=UE-UC1I.e. the voltage across the switching tube Q1 will decrease.
Because the inductors L1 and L2 have a volt-second balance relationship during operation, then:
UinDT=(UC2-Uin)×(1-D)×T=(UE-UC1-Uin)×(1-D)×T (1)
UinDT=(UC1-Uin)×(1-D)×T=(UE-UC2-Uin)×(1-D)×T (2)
the relationship can be obtained according to equations (1) and (2):
UC1=UC2=Uin/(1-D) (3)
UE/Uin=2/(1-D) (4)
u is obtained from equations (3) and (4)C1=UC2=UE/2;
Wherein, UinIs the input voltage of the booster circuit; d is the duty ratio of the switching tube according to the output powerPress UEDetermining; t is the switching frequency.
In summary, the voltage across the switching tubes Q1 and Q2 is only half of the output voltage, so the circuit has the following advantages:
1. the switching loss can be reduced to half of the common boosting voltage, so that the circuit conversion efficiency is improved;
2. the switch tube with lower input voltage can be used, so that the cost is reduced or the switch tube with the same price but better performance can be selected.
In this embodiment, since the battery of the automobile is charged by the generator of the automobile, when the generator is suddenly disconnected from the generator during operation, the voltage of the generator will be raised due to the current drop to keep the current constant because the generator is an inductive device, and thus the voltage of the generator will be raised instantaneously. If the electrical equipment mounted on the generator is unable to consume this energy, damage to the electrical equipment may result. Since the circuit of the present invention is a boost circuit, the excessive voltage is absorbed by the circuit. When the circuit is not in operation, current can be stored and supplied to the air conditioner through the diodes D1 and D3 or through the diodes D2 and D3 to the electrolytic capacitor E. When the circuit is operating, current is stored in the inductor and eventually transferred to the electrolytic capacitor E for eventual use by the air conditioner. Therefore, the circuit has the capacity of energy absorption of a parabolic load, a voltage suppression circuit is omitted, power is directly supplied to the inverter circuit, extra cost caused by adding devices is avoided, and the capacity can be fully utilized.
As shown in fig. 3, the zener diodes DZ1 and DZ2 are respectively connected in parallel to two ends of the switching tubes Q1 and Q2, and can protect the switching tubes. When the circuit suddenly turns off the switch tube during a heavy load, the energy of the inductor L1 will flow through two paths: the capacitor C1- > the diode D3 and the diode D1- > the capacitor C2; the energy of the inductance L2 will flow through two paths: capacitor C2- > diode D3 and diode D2- > capacitor C1. If the inductance energy is large, the voltage on the capacitor C1 and the capacitor C2 is increased to the output voltage, at the moment, if a low-voltage switch tube is used as the switch tube, the switch tube is damaged, and if voltage stabilizing diodes are connected in parallel at two ends of the switch tube, the energy of the voltage exceeding the withstand voltage of the switch tube can be absorbed, so that the switch tube is protected.
EXAMPLE seven
According to an embodiment of the second aspect of the present invention, a vehicle air conditioner is provided, which includes a load and the power supply control circuit in any of the above embodiments, the power supply control circuit is connected to the load, and the power supply control circuit is configured to control a power supply signal to supply power to the load, specifically, the load is a fan and/or a compressor. Therefore, the vehicle air conditioner has all the advantages of the power supply control circuit.
In the description herein, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly stated or limited otherwise; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 (12)

1. A power supply control circuit, comprising:
the boost circuit is configured to perform voltage conversion on a power supply voltage to be input to a load, and specifically includes:
a voltage-multiplying component configured to store or release a supply voltage provided by the boost circuit input,
the voltage doubling assemblies are arranged in at least two groups, and the at least two groups of voltage doubling assemblies are connected with each other.
2. The power supply control circuit according to claim 1, wherein the voltage boost circuit further comprises:
a switching device connected with the voltage-multiplying component, the switching device being configured to control the voltage-multiplying component to be turned on or off;
the energy storage assembly, the one end of energy storage assembly with voltage doubling subassembly is connected, the other end of energy storage assembly with boost circuit's output is connected, the energy storage assembly is configured to transmit after the supply voltage boost conversion that voltage doubling subassembly released to boost circuit's output.
3. The power supply control circuit of claim 2,
the voltage doubling assembly comprises a first voltage doubling assembly and a second voltage doubling assembly;
the first voltage doubling component comprises a first inductor, a first capacitor and a first diode;
the second voltage-multiplying component comprises a second inductor, a second capacitor and a second diode;
a common end between the first inductor and the second inductor is connected to an input end of the booster circuit;
one end of the first capacitor is connected to the first inductor, and the other end of the first capacitor is connected to the second inductor through the second diode;
one end of the second capacitor is connected to the second inductor, and the other end of the second capacitor is connected to the first inductor through the first diode.
4. The power supply control circuit of claim 3,
the switching device comprises a first switching device and a second switching device;
the first switching device is connected to a common terminal between the first capacitor and the first inductor;
the second switching device is connected to a common terminal between the second capacitance and the second inductance.
5. The power supply control circuit of claim 4,
the energy storage assembly comprises a third diode and an electrolytic capacitor which are connected in series;
the third diode is connected to a common terminal between the first capacitor and the second capacitor;
the common terminal among the electrolytic capacitor, the first switching device and the second switching device is connected to the output terminal of the booster circuit.
6. The power supply control circuit of claim 5,
the first switch device is conducted, and the input end of the booster circuit charges the first inductor;
the second switch device is conducted, and the input end of the booster circuit charges the second inductor;
the first switching device is turned off and the second switching device is turned on, and the first inductor discharges to the electrolytic capacitor through the first capacitor and the third diode and discharges to the second capacitor through the first diode;
the second switching device is turned off and the first switching device is turned on, and the second inductor discharges to the electrolytic capacitor through the second capacitor and the third diode and discharges to the first capacitor through the second diode.
7. The power supply control circuit of claim 2, wherein the boost circuit further comprises:
a zener diode connected in parallel with the switching device, the zener diode configured to filter voltage fluctuations during operation of the switching device.
8. The power supply control circuit according to any one of claims 2 to 7,
the switching device comprises at least one of a metal oxide semiconductor field effect transistor, an insulated gate bipolar transistor and a diode,
the gate of the metal oxide semiconductor field effect transistor is connected to an instruction output end, a reverse freewheeling diode is connected between the source electrode and the drain electrode of the metal oxide semiconductor field effect transistor, the base electrode of the insulated gate bipolar transistor is connected to the instruction output end, and the reverse freewheeling diode is connected between the emitter electrode and the collector electrode of the insulated gate bipolar transistor.
9. The power supply control circuit according to claim 5 or 6,
the capacitance value range of the electrolytic capacitor comprises 10uF to 2000 uF.
10. The power supply control circuit according to any one of claims 1 to 7, further comprising:
a power supply configured to provide a supply voltage;
an inverter circuit configured to supply power to the load according to the converted voltage control power supply signal;
a controller configured to output a control instruction and control the boost circuit to operate at a preset switching frequency and duty ratio;
the power supply, the inverter circuit and the controller are connected with the booster circuit.
11. An in-vehicle air conditioner, characterized by comprising:
a load;
the power supply control circuit of any one of claims 1 to 10 connected to the load, the power supply control circuit configured to control a power supply signal to power the load.
12. The vehicle air conditioner according to claim 11,
the load is a fan and/or a compressor.
CN201911053527.XA 2019-10-31 2019-10-31 Power supply control circuit and vehicle-mounted air conditioner Pending CN110601531A (en)

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