CN112104206A - Switch driving circuit and method, frequency converter and air conditioner - Google Patents
Switch driving circuit and method, frequency converter and air conditioner Download PDFInfo
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- CN112104206A CN112104206A CN202010844988.5A CN202010844988A CN112104206A CN 112104206 A CN112104206 A CN 112104206A CN 202010844988 A CN202010844988 A CN 202010844988A CN 112104206 A CN112104206 A CN 112104206A
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/081—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source
- H02M1/082—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source with digital control
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a switch driving circuit, a switch driving method, a frequency converter and an air conditioner. Wherein, this circuit includes: the input end of the comparison circuit is connected with the MCU, and the output end of the comparison circuit is connected with the switch circuit and is used for receiving the control signal output by the MCU and outputting a conduction control signal to the switch circuit according to the control signal so as to control the conduction state of the switch circuit; and the output end of the switch circuit is connected with the grid of the power switch, and the on or off of the power switch is controlled through the switching of the self-on state. The invention can realize control through digital signals, avoid the interference of driving signals caused by high-frequency change of voltage and current of a power loop, improve the reliability and save the cost.
Description
Technical Field
The invention relates to the technical field of electronic power, in particular to a switch driving circuit, a switch driving method, a frequency converter and an air conditioner.
Background
With increasingly fierce market competition, the driving frequency converter of the current electric appliance is developing towards the direction of high Power density, low loss and low cost, the IPM (Intelligent Power Module) driving scheme is widely applied due to high integration level and convenient application, most of inverter circuits in the driving board of the current electric appliance adopt the IPM driving scheme, the IPM has the advantages of low design difficulty, high integration level and the like, but the cost is higher, and the on-off of the IGBT can not be adjusted, so that the scheme of a Power IGBT discrete device is provided. However, when the IGBT discrete device is used, the driving signal is disturbed due to the high frequency change of the voltage and current of the power circuit, which reduces the reliability of the driving circuit.
Aiming at the problems that the driving signal is interfered and the reliability is reduced in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a switch driving circuit, a switch driving method, a frequency converter and an air conditioner, and aims to solve the problems that a driving signal is interfered and the reliability is reduced in the prior art.
In order to solve the above technical problem, the present invention provides a switch driving circuit, wherein the circuit includes:
the input end of the comparison circuit is connected with the MCU, and the output end of the comparison circuit is connected with the switch circuit and is used for receiving the control signal output by the MCU and outputting a conduction control signal to the switch circuit according to the control signal so as to control the conduction state of the switch circuit;
and the output end of the switch circuit is connected with the grid of the power switch, and the on or off of the power switch is controlled by switching the on state of the switch circuit.
Further, the comparison circuit includes:
the input ends of the first voltage division module and the second voltage division module are both connected with the MCU, the output end of the first voltage division module is connected with the non-inverting input end of the comparator, and the output end of the second voltage division module is connected with the inverting input end of the comparator;
and the output end of the comparator is connected with the switching circuit.
Further, the first pressure dividing module includes: the first logic chip, the first switch tube and the first voltage division unit; the first logic chip is used for overturning the control signal output by the MCU, one end of the first voltage division unit is connected with a first voltage source, and the other end of the first voltage division unit is grounded through the first switch tube;
the second die division module includes: the second voltage division unit is connected with the first voltage source at one end, and is grounded at the other end through the second switch tube;
the non-inverting input end of the comparator is connected between the first voltage division unit and the first switch tube, and the inverting input end of the comparator is connected between the second voltage division unit and the second switch tube; the first switching tube controls the input voltage of the non-inverting input end of the comparator through the conduction or the cut-off of the first switching tube; the second switch tube controls the input voltage of the inverting input end of the comparator through the conduction or the cut-off of the second switch tube.
Further, the first voltage division unit and the second voltage division unit both comprise at least one voltage division resistor, and when the number of the voltage division resistors is two or more, the voltage division resistors are connected in series.
Further, the switching circuit includes:
a third switching tube, the first pole of which is connected with the second voltage source, and the second pole of which is connected with the second pole of the fourth switching tube;
a first electrode of the fourth switching tube is connected with a third voltage source, and grid electrodes of the fourth switching tube and the third switching tube are both connected with the output end of the comparison circuit;
the grid electrode of the power switch is connected between the second pole of the third switching tube and the second pole of the fourth switching tube, and the emitter electrode of the power switch is connected with the third voltage source.
Further, the switch driving circuit further includes:
and the input end of the second logic chip is connected with the output end of the comparison circuit, and the output end of the second logic chip is connected with the input end of the switch circuit and is used for controlling the level signal to overturn so as to realize impedance matching.
The invention also provides a frequency converter which comprises a power switch and the switch driving circuit.
The invention also provides an air conditioner which comprises the frequency converter.
The invention also provides a switch driving method, which is applied to the switch driving circuit and comprises the following steps:
controlling an output signal of the comparison circuit according to a control signal output by the MCU, and further controlling an input signal of the switch circuit;
and controlling the on-state of the switch circuit according to the input signal of the switch circuit, and further controlling the on-state or the off-state of the power switch.
Further, the output signal of the comparison circuit is controlled according to the control signal output by the MCU, and the input signal of the switch circuit is further controlled, including:
controlling the magnitude relation between the input voltage of the non-inverting input end and the input voltage of the inverting input end of the comparator according to the control signal output by the MCU, and further controlling the output signal of the comparator;
the input signal of the switching circuit is controlled according to the output signal of the comparator.
Further, according to the control signal output by the MCU, controlling the magnitude relationship between the input voltage of the non-inverting input terminal and the input voltage of the inverting input terminal of the comparator, and further controlling the output signal of the comparator, includes:
if the MCU outputs a high level signal, controlling the input voltage of the non-inverting input end to be smaller than the input voltage of the inverting input end, and further controlling the comparator to output a low level signal;
and if the MCU outputs a low level signal, controlling the input voltage of the non-inverting input end to be larger than the input voltage of the inverting input end, and further controlling the comparator to output a high level signal.
Further, controlling the input signal of the switching circuit according to the output signal of the comparator includes:
the input signal of the control switch circuit is the same as the output signal of the comparator; alternatively, the first and second electrodes may be,
the input signal of the control switch circuit is opposite to the output signal of the comparator.
Further, controlling the on-state of the switch circuit according to the input signal of the switch circuit, and further controlling the on-state or the off-state of the power switch, includes:
if the switch circuit inputs a high level signal, a third switch tube of the switch circuit is controlled to be conducted, a fourth switch tube is controlled to be cut off, and then the power switch is controlled to be conducted;
if the switch circuit inputs a low level signal, the third switch tube of the switch circuit is controlled to be cut off, the fourth switch tube is controlled to be switched on, and then the power switch is controlled to be cut off.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described switch driving method.
By applying the technical scheme of the invention, the output signal of the comparison circuit is controlled according to the control signal output by the MCU, so that the input signal of the switch circuit is controlled, the conduction state of the switch circuit is switched, and the conduction or the cut-off of the power switch is controlled according to the conduction state of the switch circuit, thereby realizing the control through the digital signal, avoiding the high-frequency change of the voltage and the current of the power loop, causing the interference of the driving signal, improving the reliability and saving the cost.
Drawings
Fig. 1 is a block diagram of a switch driving circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a switch driving circuit according to another embodiment of the present invention;
fig. 3 is a block diagram of a switch driving circuit according to still another embodiment of the present invention;
fig. 4 is a flowchart of a switch driving method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe the voltage dividing modules in the embodiments of the present invention, the voltage dividing modules should not be limited to these terms. These terms are only used to distinguish between different voltage divider modules. For example, a first voltage divider module may also be referred to as a second voltage divider module, and similarly, a second voltage divider module may also be referred to as a first voltage divider module without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a switch driving circuit, which is applied to driving a power switch, wherein the power switch includes a gate G, a collector C and an emitter E, the collector C is connected to a power supply VDCAnd a voltage source U, a voltage of the gate G is V, fig. 1 is a structural diagram of a switch driving circuit according to an embodiment of the present invention, as shown in fig. 1, the switch driving circuit includes:
a comparison circuit 1, an input end of which is connected to a micro control unit MCU (not shown in the figure), an output end of which is connected to the switch circuit 2, and is configured to receive a control signal output by the MCU, wherein the control signal is a digital variable modulated by an FOC control algorithm and includes a high level signal or a low level signal, and the comparison circuit 1 outputs a conduction control signal to the switch circuit 2 according to the control signal output by the MCU, so as to control a conduction state of the switch circuit 2;
the power switch further comprises a switch circuit 2, the output end of the switch circuit 2 is connected with the grid G of the power switch, and the switch circuit 2 switches the on state according to a high level signal or a low level signal input by the switch circuit 2 so as to control the on or off of the power switch.
The switch driving circuit of the embodiment controls the output signal of the comparison circuit 1 according to the control signal output by the MCU, thereby controlling the input signal of the switch circuit 2, switching the on state of the switch circuit 2, and further controlling the on or off of the power switch through the on state of the switch circuit 2, which can realize the control through the digital signal, avoid the high frequency change of the voltage and the current of the power loop, which causes the interference of the driving signal, and improve the reliability.
Example 2
In this embodiment, another switch driving circuit is provided, and fig. 2 is a structural diagram of a switch driving circuit according to another embodiment of the present invention, in order to realize that when the MCU outputs different control signals, the comparison circuit 1 outputs different signals accordingly, as shown in fig. 2, the comparison circuit 1 includes:
the input ends of the first voltage division module 11 and the second voltage division module 12 are both connected with the MCU, that is, the input signals of the first voltage division module 11 and the second voltage division module 12 are the same, except that the output end of the first voltage division module 11 is connected with the non-inverting input end + of the comparator A and is used for controlling the input voltage of the non-inverting input end + of the comparator A, and the output end of the second voltage division module 12 is connected with the inverting input end-of the comparator A and is used for controlling the input voltage of the inverting input end-of the comparator A; the output end of the comparator A is connected with the switch circuit 2.
In order to realize the control of the input voltage of the non-inverting input terminal and the input voltage of the inverting input terminal of the comparator, respectively, the first voltage division module 11 includes: a first logic chip IC1, a first switch tube T1 and a first voltage division unit 111; the first logic chip IC1 is configured to invert the control signal output by the MCU, for example, if the MCU outputs a high level signal, the signal output by the first logic chip IC1 is a low level signal, and if the MCU outputs a low level signal, the signal output by the first logic chip IC1 is a high level signal, so that when the input signals are the same, the first switch tube T1 and the second switch tube T2 are in different conduction states, and the input voltage at the non-inverting input end and the input voltage at the inverting input end of the comparator are higher or lower; one end of the first voltage dividing unit 111 is connected to the first voltage source U1, and the other end is grounded through the first switch tube T1. Preferably, the first switch transistor T1 is an N-channel MOS transistor for isolating the high voltage at the signal input side, and is turned on when a high level signal is input to its gate and turned off when a low level signal is input.
The second division module 12 includes: a second switch tube T2 and a second voltage dividing unit 121, wherein one end of the second voltage dividing unit 121 is connected to the first voltage source U1, and the other end is grounded through the second switch tube T2. Preferably, the second switch transistor T2 is also an N-channel type MOS transistor.
The non-inverting input terminal + of the comparator a is connected between the first voltage dividing unit 111 and the first switching tube T1, the inverting input terminal-of the comparator a is connected between the second voltage dividing unit 121 and the second switching tube T2, the first switching tube T1 controls the input voltage of the non-inverting input terminal + of the comparator a by turning on or off itself, specifically, when the first switching tube T1 is turned on, the input voltage of the non-inverting input terminal + of the comparator is pulled down to be close to 0V, and when the first switching tube T1 is turned off, the input voltage of the non-inverting input terminal + of the comparator is a voltage divided by the first voltage dividing unit 111 and is far higher than 0V. The second switch tube T2 controls the input voltage to the inverting input terminal of the comparator a by turning on or off itself, and specifically, when the second switch tube T2 is turned on, the input voltage to the inverting input terminal of the comparator a is pulled down to be close to 0V, and when the second switch tube T2 is turned off, the input voltage to the inverting input terminal of the comparator a is the voltage divided by the second voltage dividing unit 121 and is much higher than 0V.
The first voltage dividing unit 111 includes at least one voltage dividing resistor, and when the first voltage dividing unit 111 includes two or more voltage dividing resistors, different voltage dividing resistors are connected in series, and similarly, the second voltage dividing unit 121 also includes at least one voltage dividing resistor, and when the second voltage dividing unit 121 includes two or more voltage dividing resistors, different voltage dividing resistors are also connected in series. For example, the first voltage dividing unit 111 includes three voltage dividing resistors, i.e., a first resistor R1, a second resistor R2, and a third resistor R3, the first resistor R1, the second resistor R2, and the third resistor R3 are sequentially connected in series end to end, the first end of the first resistor R1 is connected to the first voltage source U1, the tail end of the third resistor R3 is grounded through the first switch tube T1, the second voltage dividing unit 121 includes three voltage dividing resistors, i.e., a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 are sequentially connected in series end to end, the head end of the fourth resistor R4 is connected to the first voltage source U1, and the tail end of the sixth resistor R6 is grounded through the second switch tube T2.
In a specific implementation process, after the MCU outputs a high level signal, on one hand, the first logic chip IC1 inverts the high level signal output by the MCU and converts the high level signal into a low level signal, the first switch transistor T1 is turned off to pull up the voltage at a point between the first switch transistor T1 and the first voltage dividing unit 111, that is, to pull up the input voltage at the non-inverting input terminal + of the comparator a, on the other hand, the second switch transistor T2 directly inputs the high level signal and is turned on, and the voltage at a point between the second switch transistor T2 and the first voltage dividing unit 111 is pulled down to approximately 0V, so that the input voltage at the inverting input terminal of the comparator a is lower, and as a result, the input voltage at the non-inverting input terminal + of the comparator a is greater than the input voltage at the inverting input terminal — and the comparator a outputs the high level signal. On the contrary, after the MCU outputs a low level signal, on the one hand, the first logic chip IC1 inverts the low level signal output by the MCU and converts the low level signal into a high level signal, the first switch tube T1 is turned on to pull down the voltage at the point between the first switch tube T1 and the first voltage dividing unit 111 to approximately 0V, i.e., to pull down the input voltage at the non-inverting input terminal + of the comparator a, on the other hand, the second switch tube T2 directly inputs the low level signal and turns off, and the voltage at the point between the second switch tube T2 and the first voltage dividing unit 111 is pulled up to raise the input voltage at the inverting input terminal of the comparator a, and as a result, the input voltage at the non-inverting input terminal + of the comparator a is smaller than the input voltage at the inverting input terminal — and the comparator a outputs a low level signal.
As described above, the present invention finally controls the on/off of the power switch by switching the on state, and in order to realize that the on state of the switch circuit 2 can be switched according to the input level signal, the switch circuit 2 includes:
a third switch tube T3, a first pole (drain) of the third switch tube T3 is connected to the second voltage source U2, a second pole (source) is connected to a second pole (source) of the fourth switch tube T4, preferably, the third switch tube T3 is an N-channel MOS tube, which is turned on when a high level signal is inputted to a gate thereof, and turned off when a low level signal is inputted thereto; a fourth switching tube T4, a first electrode (drain) of which is connected to the third voltage source U3, and gates of the fourth switching tube and the third switching tube are both connected to the output terminal of the comparison circuit 1, preferably, the fourth switching tube T4 is a P-channel MOS tube, and is turned on when a low level signal is input to the gate thereof, and is turned off when a high level signal is input to the gate thereof.
The gate G of the power switch is connected between the second pole (source) of the third switch tube and the second pole (source) of the fourth switch tube, and the emitter E of the power switch is connected to a third voltage source U3, wherein the third voltage source U3 and the voltage source U may be the same voltage source.
In this embodiment, the signal output by the comparator a is directly used as the input signal of the switch circuit 2, when the comparator a outputs a high level signal, the switch circuit 2 inputs the high level signal, the third switch transistor T3 of the switch circuit 2 is turned on, the fourth switch transistor T4 is turned off, the voltage of the gate G of the power switch is pulled high, and the power switch is controlled to be turned on; when the comparator a outputs a low level signal, the switch circuit 2 inputs the low level signal, the third switch tube T3 of the switch circuit 2 is turned off, the fourth switch tube T4 is turned on, so that no voltage difference is generated between the voltage of the gate G and the voltage of the emitter E of the power switch, and the power switch is controlled to be turned off.
Example 3
This embodiment provides another switch driving circuit, fig. 3 is a structural diagram of a switch driving circuit according to another embodiment of the present invention, and as shown in fig. 3, on the basis of the above embodiment, the switch driving circuit further includes: after the second logic chip IC2 is provided, the embodiment is different from the above embodiment in that since the second logic chip IC2 has the function of an inversion signal, when the comparator a outputs a high level signal, the switch circuit 2 inputs a low level signal; when the comparator a outputs a low level signal, the switch circuit 2 inputs a high level signal. The control principle of the subsequent switch circuit 2 is the same as that of the above embodiment, and is not described here again.
Because the input impedance of the second logic chip IC2 is large, the output impedance is small, and the impedance matching effect of the whole circuit is realized.
In addition, different from the above embodiments, in this embodiment, the third switching transistor T3 is a P-channel MOS transistor, the fourth switching transistor T4 is an N-channel MOS transistor, and the control processes of the third switching transistor T3 and the fourth switching transistor T4 are changed accordingly, specifically:
when a high-level signal is input, the third switch tube T3 is turned off, the fourth switch tube T4 is turned on, so that no voltage difference is generated between the grid G and the emitter E of the power switch, and the power switch is controlled to be turned off;
when a low-level signal is input, the third switching tube T3 is turned on, the fourth switching tube T4 is turned off, the voltage of the gate G of the power switch is pulled high, and the power switch is controlled to be turned on.
Example 4
This embodiment provides a switch driving method applied to the switch driving circuit described in the above embodiments, and fig. 4 is a flowchart of the switch driving method according to the embodiment of the present invention, as shown in fig. 4, the method includes:
s401, controlling the output signal of the comparison circuit according to the control signal output by the MCU, and further controlling the input signal of the switch circuit.
The control signal output by the MCU is a digital variable output after being modulated by an FOC control algorithm and comprises a high level signal or a low level signal, the comparison circuit outputs different signals to the switch circuit according to the high level signal or the low level signal output by the MCU, and the signal output by the comparison circuit is the high level signal or the low level signal.
S402, controlling the on state of the switch circuit according to the input signal of the switch circuit, and further controlling the on or off of the power switch.
The output signal of the comparator may be directly used as the input signal of the switch circuit, or after conversion, used as the input signal of the switch circuit, and the switch circuit switches the conducting state according to the input signal, for example, when a high level signal is input, the conducting state of the switch circuit is the first conducting state, and in the first conducting state, the power switch is conducting; when a low level signal is input, the on state of the switch circuit is a second on state, and the power switch is turned on and off in the second on state.
In the switch driving method of the embodiment, the output signal of the comparison circuit is controlled according to the control signal output by the MCU, so as to control the input signal of the switch circuit; controlling the on-state of the switch circuit according to the input signal of the switch circuit, and further controlling the on-state or the off-state of the power switch; the control can be realized through digital signals, the high-frequency change of voltage and current of a power loop is avoided, the driving signal is prevented from being interfered, and the reliability is improved.
Example 5
In this embodiment, another switch driving method is provided, in which the comparison circuit includes a comparator, and the comparator outputs high and low ground level signals by comparing the magnitude between the input voltage at the non-inverting input terminal and the input voltage at the inverting input terminal, and therefore, the step S401 specifically includes: controlling the magnitude relation between the input voltage of the non-inverting input end and the input voltage of the inverting input end of the comparator according to the control signal output by the MCU, and further controlling the output signal of the comparator; the input signal of the switching circuit is controlled according to the output signal of the comparator. Specifically, after the MCU outputs a high level signal, on one hand, the first logic chip inverts the high level signal output by the MCU and converts the inverted high level signal into a low level signal, the first switch tube is turned off to pull up the voltage at the point between the first switch tube and the first voltage dividing unit, i.e., to pull up the input voltage at the non-inverting input terminal + of the comparator, on the other hand, the second switch tube directly inputs the high level signal and turns on, the voltage at the point between the second switch tube and the first voltage dividing unit is pulled down to approximately 0V, so that the input voltage at the inverting input terminal of the comparator is lower. On the contrary, after the MCU outputs a low level signal, on the one hand, the first logic chip IC1 inverts the low level signal output by the MCU and converts the low level signal into a high level signal, the first switch transistor T1 is turned on to pull down the voltage at the point between the first switch transistor and the first voltage dividing unit to approximately 0V, i.e., to pull down the input voltage at the non-inverting input terminal + of the comparator, on the other hand, the second switch transistor directly inputs the low level signal and is turned off, and the voltage at the point between the second switch transistor and the first voltage dividing unit is pulled up to raise the input voltage at the inverting input terminal of the comparator.
After the comparator outputs a signal, controlling an input signal of the switching circuit according to the output signal of the comparator, specifically comprising: the input signal of the control switch circuit is the same as the output signal of the comparator, for example, the output end of the comparator is directly connected to the input end of the switch circuit, when the comparator outputs a high level signal, the switch circuit inputs a high level signal, when the comparator outputs a low level signal, the switch circuit inputs a low level signal; alternatively, the input signal for controlling the switch circuit is opposite to the output signal of the comparator, for example, between the output terminal of the comparator and the input terminal of the switch circuit, which is a second logic chip, and the output signal of the comparator is inverted, that is, when the comparator outputs a high level signal, the switch circuit inputs a low level signal, and when the comparator outputs a low level signal, the switch circuit inputs a high level signal.
In this embodiment, after the switching circuit inputs the signal, the switching circuit may present different on states according to the input signal of the switching circuit, so as to control the power switch to be turned on or off, specifically including: if the switch circuit inputs a high level signal, a third switch tube of the switch circuit is controlled to be conducted, a fourth switch tube is controlled to be cut off, and then the power switch is controlled to be conducted; if the switch circuit inputs a low level signal, the third switch tube of the switch circuit is controlled to be cut off, the fourth switch tube is controlled to be switched on, and then the power switch is controlled to be cut off.
It should be noted that, in the method of this embodiment, for a case that the third switching transistor T3 is an N-channel MOS transistor and the fourth switching transistor T4 is a P-channel MOS transistor, in other embodiments of the present invention, the third switching transistor T3 may also be a P-channel MOS transistor and the fourth switching transistor T4 is an N-channel MOS transistor, and a control process of the switching circuit is changed accordingly, specifically:
if the switch circuit inputs a high level signal, the third switch tube of the switch circuit is controlled to be cut off, and the fourth switch tube is controlled to be conducted, so that no pressure difference is generated between the grid voltage and the emitter voltage of the power switch, and the power switch is controlled to be cut off; if the switch circuit inputs a low level signal, the third switch tube of the switch circuit is switched on, the fourth switch tube is switched off, the grid voltage of the power switch is pulled high, and the power switch is controlled to be switched on.
Example 6
The present embodiment provides another switch driving method, which is applied to the switch driving circuit in embodiment 3, and the specific steps include:
and S1, the MCU outputs a digital control signal after being modulated by an FOC control algorithm, and controls the first logic chip IC1 and the comparator.
Specifically, when the digital control signal output by the MCU is a low level signal, the first logic chip IC1 inputs a low level signal, and outputs a high level signal after inverting the low level signal, the first switch tube is turned on, the second switch tube is turned off, the input voltage at the non-inverting input terminal of the comparator is pulled down to be close to 0V, the input voltage at the inverting input terminal of the comparator is equal to the voltage divided by the voltage dividing resistors R4-R6 and is much greater than 0V, that is, the input voltage at the inverting input terminal of the comparator is greater than the input voltage at the non-inverting input terminal, and the comparator outputs a low level signal; when the digital control signal output by the MCU is a high level signal, the first logic chip IC1 inputs a high level signal, and outputs a low level signal after the high level signal is inverted, the first switch tube is turned off, the second switch tube is turned on, the input voltage at the non-inverting input terminal of the comparator is equal to the voltage divided by the voltage dividing resistors R1-R3, which is much greater than 0V, the input voltage at the inverting input terminal of the comparator is pulled down to nearly 0V, i.e., the input voltage at the non-inverting input terminal of the comparator is greater than the input voltage at the inverting input terminal, and the comparator outputs a high level signal.
S2, the on state of the switch circuit is controlled according to the output signal of the comparator.
When the output of the comparator is a low level signal, the second logic chip inverts the low level signal and outputs a high level signal, the third switch tube is cut off, and the fourth switch tube is switched on; when the output of the comparator is a high level signal, the second logic chip inverts the high level signal and outputs a low level signal, the third switch tube is switched on, and the fourth switch tube is switched off.
And S3, controlling the power switch to be turned on or off according to the on state of the switch circuit.
If the third switching tube is cut off and the fourth switching tube is conducted, the grid signal of the power switch IGBT is a low-level signal, and the power switch IGBT is cut off; if the third switching tube is conducted and the fourth switching tube is cut off, the grid signal of the power switch IGBT is a high-level signal, and the power switch IGBT is conducted.
According to the driving method, the four switching tubes in the circuit are controlled to be conducted alternately through the first logic chip, the comparator and the second logic chip, so that a gate driving signal of the IGBT is obtained, meanwhile, the circuit isolates high voltage on the input side through the N-channel type first switching tube and the second switching tube, driving power amplification is obtained, and direct driving of the power switch IGBT through the MCU is achieved.
Example 7
The embodiment provides a frequency converter, which comprises a power switch and a switch driving circuit in the above embodiment, and is used for directly driving the power switch through a digital signal output by an MCU (microprogrammed control unit), so that the high-frequency change of voltage and current of a power loop is avoided, the driving signal is prevented from being interfered, and the reliability is improved.
Example 8
This embodiment provides an air conditioner, includes the converter of embodiment 7, through promoting the reliability of converter, promotes the holistic performance of air conditioner.
Example 9
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the above-described switch driving method.
The above-described circuit embodiments are only illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. A switch driving circuit, comprising:
the input end of the comparison circuit is connected with the MCU, and the output end of the comparison circuit is connected with the switch circuit and is used for receiving the control signal output by the MCU and outputting a conduction control signal to the switch circuit according to the control signal so as to control the conduction state of the switch circuit;
and the output end of the switch circuit is connected with the grid of the power switch, and the on or off of the power switch is controlled by switching the on state of the switch circuit.
2. The circuit of claim 1, wherein the comparison circuit comprises:
the input ends of the first voltage division module and the second voltage division module are both connected with the MCU, the output end of the first voltage division module is connected with the non-inverting input end of the comparator, and the output end of the second voltage division module is connected with the inverting input end of the comparator;
and the output end of the comparator is connected with the switching circuit.
3. The circuit of claim 2,
the first pressure division module includes: the first logic chip, the first switch tube and the first voltage division unit; the first logic chip is used for overturning the control signal output by the MCU, one end of the first voltage division unit is connected with a first voltage source, and the other end of the first voltage division unit is grounded through the first switch tube;
the second die division module includes: the second voltage division unit is connected with the first voltage source at one end, and is grounded at the other end through the second switch tube;
the non-inverting input end of the comparator is connected between the first voltage division unit and the first switch tube, and the inverting input end of the comparator is connected between the second voltage division unit and the second switch tube; the first switching tube controls the input voltage of the non-inverting input end of the comparator through the conduction or the cut-off of the first switching tube; the second switch tube controls the input voltage of the inverting input end of the comparator through the conduction or the cut-off of the second switch tube.
4. The circuit of claim 3,
the first voltage division unit and the second voltage division unit both comprise at least one voltage division resistor, and when the number of the voltage division resistors is two or more, the voltage division resistors are connected in series.
5. The circuit of claim 1, wherein the switching circuit comprises:
a third switching tube, the first pole of which is connected with the second voltage source, and the second pole of which is connected with the second pole of the fourth switching tube;
a first electrode of the fourth switching tube is connected with a third voltage source, and grid electrodes of the fourth switching tube and the third switching tube are both connected with the output end of the comparison circuit;
the grid electrode of the power switch is connected between the second pole of the third switching tube and the second pole of the fourth switching tube, and the emitter electrode of the power switch is connected with the third voltage source.
6. The circuit of claim 1, wherein the switch driver circuit further comprises:
and the input end of the second logic chip is connected with the output end of the comparison circuit, and the output end of the second logic chip is connected with the input end of the switch circuit and is used for controlling the level signal to overturn so as to realize impedance matching.
7. Frequency converter comprising a power switch, characterized in that it further comprises a switch drive circuit according to any one of claims 1 to 6.
8. An air conditioner characterized by comprising the inverter of claim 7.
9. A switch driving method applied to the switch driving circuit according to any one of claims 1 to 6, the method comprising:
controlling an output signal of the comparison circuit according to a control signal output by the MCU, and further controlling an input signal of the switch circuit;
and controlling the on-state of the switch circuit according to the input signal of the switch circuit, and further controlling the on-state or the off-state of the power switch.
10. The method of claim 9, wherein controlling the output signal of the comparator circuit and the input signal of the switch circuit according to the control signal output by the MCU comprises:
controlling the magnitude relation between the input voltage of the non-inverting input end and the input voltage of the inverting input end of the comparator according to the control signal output by the MCU, and further controlling the output signal of the comparator;
the input signal of the switching circuit is controlled according to the output signal of the comparator.
11. The method of claim 10, wherein controlling the magnitude relationship between the input voltage at the non-inverting input terminal and the input voltage at the inverting input terminal of the comparator according to the control signal output by the MCU comprises:
if the MCU outputs a high level signal, controlling the input voltage of the non-inverting input end to be smaller than the input voltage of the inverting input end, and further controlling the comparator to output a low level signal;
and if the MCU outputs a low level signal, controlling the input voltage of the non-inverting input end to be larger than the input voltage of the inverting input end, and further controlling the comparator to output a high level signal.
12. The method of claim 10, wherein controlling the input signal of the switching circuit according to the output signal of the comparator comprises:
the input signal of the control switch circuit is the same as the output signal of the comparator; alternatively, the first and second electrodes may be,
the input signal of the control switch circuit is opposite to the output signal of the comparator.
13. The method of claim 9, wherein controlling the on state of the switch circuit according to the input signal of the switch circuit, and further controlling the power switch to be turned on or off, comprises:
if the switch circuit inputs a high level signal, a third switch tube of the switch circuit is controlled to be conducted, a fourth switch tube is controlled to be cut off, and then the power switch is controlled to be conducted;
if the switch circuit inputs a low level signal, the third switch tube of the switch circuit is controlled to be cut off, the fourth switch tube is controlled to be switched on, and then the power switch is controlled to be cut off.
14. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 9 to 13.
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| CN202010844988.5A CN112104206B (en) | 2020-08-20 | 2020-08-20 | Switch driving circuit and method, frequency converter and air conditioner |
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| CN202010844988.5A CN112104206B (en) | 2020-08-20 | 2020-08-20 | Switch driving circuit and method, frequency converter and air conditioner |
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| CN112104206B (en) | 2023-04-14 |
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