CN111404525B - Signal detection circuit, switching tube driving control circuit, control method and air conditioner - Google Patents
Signal detection circuit, switching tube driving control circuit, control method and air conditioner Download PDFInfo
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- CN111404525B CN111404525B CN202010219135.2A CN202010219135A CN111404525B CN 111404525 B CN111404525 B CN 111404525B CN 202010219135 A CN202010219135 A CN 202010219135A CN 111404525 B CN111404525 B CN 111404525B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/288—Modifications for introducing a time delay before switching in tube switches
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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
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Abstract
The invention provides a signal detection circuit, a switching tube driving control circuit and an air conditioner. The signal detection circuit can be applied to detection of the switching tube and comprises a signal acquisition end, a first reference voltage source, a comparison circuit and a signal output end, wherein the comparison circuit is used for comparing the voltage of a driving signal of the switching tube with the first reference voltage so as to detect an oscillation signal in the driving control signal. Through the detection to shock signal in the switching tube drive control signal, can be convenient for the controller to adjust the switching tube drive control signal of output, reduce its output, and then avoid the switching tube during operation because the switching shock signal damages.
Description
Technical Field
The present disclosure relates to the field of electronic circuits, and more particularly, to a signal detection circuit, a switching power supply, a power factor correction circuit, a switching tube driving control method, a control device, an air conditioner, and a computer readable storage medium.
Background
In order to meet the functional requirements, the household appliances on the market currently apply high-power circuit modules in the circuit. The high-power circuit modules usually adopt power switching tubes as high-speed switching devices in the circuit, for example, switching tubes such as IGBT, IGCT, MOS tubes with the characteristics of large current, high voltage blocking and switching frequency, high reliability, compact structure, low conduction loss and the like are adopted, and power is output to electric equipment.
In practical application of the switching tube, a primary driving circuit is usually required to be arranged between a signal source and the switching tube, and the switching tube is driven after the signal is amplified. At present, all driving circuits adopt an open-loop control method to control a switching tube, the switching tube is driven in an open-loop control mode, if a driving signal oscillates, the switching tube is continuously turned on and off in the turn-on process, and the switching tube is damaged due to overlarge loss.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a number detection circuit, a switching power supply, a power factor correction circuit, a switching tube driving control method, a control device, an air conditioner and a computer readable storage medium, which can detect an oscillation signal in a switching tube driving control signal.
According to a first aspect of the present invention, there is provided a signal detection circuit for detecting a switching tube, the signal detection circuit comprising:
the signal acquisition end is connected with the control end of the switching tube and is used for acquiring a driving control signal of the control end of the switching tube;
the first reference voltage source is used for providing a first reference voltage which is smaller than or equal to the conduction voltage of the switching tube;
The comparison circuit comprises a first input end, a second input end and a first output end, wherein the first input end is connected with the signal acquisition end, the second input end is connected with the first reference voltage source, the comparison circuit is used for comparing the voltage of the driving signal with the first reference voltage so as to detect an oscillation signal in the driving control signal, and the first output end is used for outputting a detection signal corresponding to the oscillation signal;
and the signal output end is connected with the first output end.
The comparison circuit compares the first reference voltage with a switching tube driving control signal from a switching tube control end, and when the switching tube driving control signal generates an oscillation signal, the comparison circuit can detect the oscillation signal in the switching tube driving control signal by outputting a detection signal corresponding to the oscillation signal because the trough voltage of the oscillation signal is lower than the first reference voltage. Through the detection to shock signal in the switching tube drive control signal, can be convenient for the controller to adjust the switching tube drive control signal of output, reduce its output, and then avoid the switching tube during operation because the switching shock signal damages.
According to some embodiments of the invention, the comparing circuit comprises a first comparator, a positive phase input of the first comparator is the first input, a negative phase input of the first comparator is the second input, and an output of the first comparator is the first output. The comparator performs a comparison between a voltage of the drive signal and the first reference voltage.
According to some embodiments of the invention, the first reference voltage source comprises a first voltage divider circuit and a first power supply input terminal, the first power supply input terminal being connected to the second input terminal through the first voltage divider circuit. The first reference voltage source provides a first reference voltage.
According to some embodiments of the invention, the signal detection circuit further comprises:
the third input end is used for being connected with the output end of the controller, and the output end of the controller is used for sending the driving control signal to the switching tube;
the switching circuit is arranged between the signal output end and the first output end, and the control end of the switching circuit is connected with the third input end.
The signal detection circuit introduces a driving control signal from the controller and controls the on-off of the switching circuit to selectively output signals. When the driving control signal is at a high level, the control switch circuit is turned on, the signal output end outputs a detection signal, when the driving control signal is at a low level, the control switch circuit is turned off, and the signal output end does not output the detection signal, so that the comparison circuit can output the detection signal when the driving control signal is at the low level, and the controller can judge whether the switching tube oscillates or not only according to the presence or absence of the detection signal without depending on an algorithm of the controller.
According to some embodiments of the invention, the signal detection circuit further comprises a first delay circuit, the first delay circuit being arranged between the control terminal and the third input terminal of the switching circuit.
In an embodiment, the switching circuit includes a first switching tube, an input end of the first switching tube is connected with the first output end, an output end of the first switching tube is connected with the signal output end, and a control end of the first switching tube is connected with the third input end through the delay circuit.
The first delay circuit is configured to delay signals, and the driving control signals are led in to delay on-off control of the switching tube after passing through the delay circuit so as to realize synchronization of the output detection signals and the driving output signals of the switching tube.
According to some embodiments of the invention, the signal detection circuit further comprises a second delay circuit for delaying the detection signal, the second delay circuit being arranged between the output of the switching circuit and the signal output.
In an embodiment, the second delay circuit includes a second comparator, a second voltage dividing circuit, and a second power input end, where a positive phase input end of the second comparator is connected to the first output end, a negative phase input end of the second comparator is connected to the second power input end through the second voltage dividing circuit, an output end of the second comparator is connected to the signal output end, and an output end of the second comparator is also connected to the second power input end through an impedance element; the second end of the first capacitor is connected with the non-inverting input end of the second comparator.
Because the pull-down time of the switch tube oscillation is shorter, the time of the detection signal output by the comparison circuit is shorter, and the controller can not detect the detection signal, by introducing the second delay circuit, the detection signal output by the first delay circuit is delayed, so that the controller can detect the oscillation signal more easily.
According to a second aspect of the present invention, there is provided a switching tube drive control circuit comprising:
a switching tube;
the output end of the controller is electrically connected with the control end of the switching tube and is used for providing a driving control signal for the switching tube;
according to the signal detection circuit of the first aspect of the invention, the signal acquisition end of the signal detection circuit is connected with the control end of the switching tube, and the signal output end of the signal detection circuit is connected with the input end of the controller.
According to a third aspect of the present invention, a switching power supply is provided. The switching power supply comprises the signal detection circuit according to the first aspect of the invention or comprises the switching tube driving control circuit according to the second aspect of the invention.
According to a fourth aspect of the present invention, there is provided a power factor correction circuit comprising the signal detection circuit according to the first aspect of the present invention, or comprising the switching tube drive control circuit according to the second aspect of the present invention.
According to a fifth aspect of the present invention, there is provided an air conditioner comprising the signal detection circuit of the first aspect of the present invention, or comprising the switching tube driving control circuit of the second aspect of the present invention, or comprising the switching power supply of the third aspect of the present invention, or the power factor correction circuit of the fourth aspect of the present invention.
One of the above technical solutions of the present disclosure has at least one of the following advantages or beneficial effects: the comparison circuit compares the first reference voltage with a switching tube driving control signal from a switching tube control end, and when the switching tube driving control signal generates an oscillation signal, the comparison circuit can detect the oscillation signal in the switching tube driving control signal by outputting a detection signal corresponding to the oscillation signal because the trough voltage of the oscillation signal is lower than the first reference voltage. Through the detection to shock signal in the switching tube drive control signal, can be convenient for the controller adjust the switching tube drive control signal of output, reduce its output, and then avoid the switching tube during operation because the switching shock signal damages, prolong the operating life of switching tube, reinforcing equipment's reliability.
According to a sixth aspect of the present invention, there is provided a driving control method of a switching tube, which is applied to a switching tube driving control circuit. The switching tube driving control circuit includes:
a switching tube;
the output end of the controller is electrically connected with the control end of the switching tube and is used for providing a driving control signal for the switching tube;
the signal detection circuit comprises a comparison circuit and a first reference voltage source, wherein the first reference voltage source is used for providing a first reference voltage for the comparison circuit, and the first reference voltage is smaller than or equal to the conduction voltage of the switching tube;
the comparison circuit comprises a first input end, a second input end and a first output end, wherein the first input end is connected with the control end of the switching tube, the second input end is connected with the first reference voltage source, the first output end is connected with the input end of the controller, the comparison circuit is used for comparing the voltage of the driving signal with the first reference voltage so as to detect an oscillation signal in the driving control signal, and the first output end is used for outputting a detection signal corresponding to the oscillation signal;
the method comprises the following steps:
Acquiring a detection signal from the comparison circuit;
judging whether a driving control signal input to the control end of the switching tube has an oscillating signal or not according to the detection signal;
and responding to the oscillation signal, and adjusting the driving control signal to reduce the output power of the driving control signal.
Through comparing the voltage of switch tube drive signal and first reference voltage, when the drive signal appears oscillating signal phenomenon, because of oscillating signal's trough voltage is less than reference voltage, can judge to input to the drive control signal of switch tube control end has oscillating signal, when the oscillating signal appears through the controller is right drive control signal adjusts, so as to reduce drive control signal's output, reduce the appearance that the switch oscillates, and then avoid the switch tube during operation to damage because of the switch concussion, prolong the operating life of switch tube, reinforcing equipment's reliability.
According to some embodiments of the invention, the adjusting the drive control signal in response to the oscillation signal includes:
and responding to the oscillation signal, and reducing the duty ratio of the driving control signal.
Because the switching oscillation is related to the current passing through the switching tube, the current flowing through the switching tube can be effectively reduced by reducing the duty ratio of the driving control signal, and the switching oscillation is further reduced.
According to some embodiments of the invention, the determining whether the oscillation signal exists in the driving control signal output by the driving circuit according to the detection signal includes the following steps:
acquiring the state of a currently output driving control signal; and
and if the current driving control signal is in a high level and the current detection signal is in a low level, judging that the driving control signal at the control end of the switching tube has an oscillating signal.
According to some embodiments of the invention, the first output terminal is connected to an input terminal of the controller through a switching circuit, a control terminal of the switching circuit is connected to an output terminal of the controller, and the switching circuit is configured to be turned on when the controller outputs a high level;
the step of judging whether the driving control signal output by the driving circuit has an oscillation signal according to the detection signal comprises the following steps:
and if the acquired detection signal is in a low level, judging that the driving control signal of the control end of the switching tube has an oscillation signal.
The above steps may exclude the influence of the high level of the driving control signal on the detection result.
According to a seventh aspect of the present invention, there is provided a control apparatus. The control device includes: the driving control method of the switching tube according to the sixth aspect of the present invention is implemented by a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program.
According to an eighth aspect of the present invention, there is provided an air conditioner. The air conditioner comprises the control device according to the seventh aspect of the invention.
According to a ninth aspect of the present invention, there is provided a computer-readable storage medium storing computer-executable instructions for performing the driving control method of a switching tube according to the sixth aspect of the present invention.
One of the above technical solutions of the present disclosure has at least one of the following advantages or beneficial effects: the comparison circuit compares the first reference voltage with a switching tube driving control signal from a switching tube control end, and when the switching tube driving control signal generates an oscillation signal, the comparison circuit can detect the oscillation signal in the switching tube driving control signal by outputting a detection signal corresponding to the oscillation signal because the trough voltage of the oscillation signal is lower than the first reference voltage. Through the detection to shock signal in the switching tube drive control signal, can be convenient for the controller adjust the switching tube drive control signal of output, reduce its output, and then avoid the switching tube during operation because the switching shock signal damages, prolong the operating life of switching tube, reinforcing equipment's reliability.
Drawings
In order to more clearly illustrate the specific embodiments of the present disclosure or the solutions in the prior art, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to the structures shown in these drawings without inventive effort to a person having ordinary skill in the art.
FIG. 1 is an exemplary oscillating waveform diagram of a driving signal;
FIG. 2 is a schematic diagram of a signal detection circuit according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a signal detection circuit according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a signal detection circuit according to a third embodiment of the present invention;
FIG. 5 is a schematic diagram of a signal detection circuit according to a fourth embodiment of the present invention;
fig. 6 is a schematic diagram of a signal detection circuit according to a fifth embodiment of the present invention;
fig. 7 is a schematic diagram of a signal detection circuit according to a sixth embodiment of the present invention;
FIG. 8 is a circuit diagram of the signal detection circuit shown in FIG. 7;
fig. 9 is a schematic diagram of a signal detection circuit according to a seventh embodiment of the present invention;
FIG. 10 is a flow chart of a switching tube driving control method according to an embodiment of the present invention;
FIG. 11 is a flow chart of a switching tube driving control method according to another embodiment of the present invention;
FIG. 12 is a flow chart of a switching tube driving control method according to still another embodiment of the present invention;
fig. 13 is a schematic view of a control device according to an embodiment of the present invention.
Wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functions.
The achievement of the object, functional features and advantages of the present invention will be further described hereinafter with reference to the accompanying drawings by way of examples.
Detailed Description
Technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the present disclosure, which are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
It should be noted that in the description of the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may explicitly or implicitly include one or more features.
It should be further noted that, if directional indications are referred to in the embodiments of the present disclosure, such as up, down, left, right, front, rear, etc., the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (e.g., as shown in the drawings), and if the specific posture is changed, the directional indications should be correspondingly changed accordingly.
Furthermore, unless explicitly specified and limited otherwise, the term "coupled/connected" is to be interpreted broadly, as for example, being either fixedly coupled or movably coupled, being either detachably coupled or not detachably coupled, or being integrally coupled; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements.
Finally, in the description of the present disclosure, descriptions of terms "one embodiment/implementation," "another embodiment/implementation," or "certain embodiments/implementations," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or implementation of the present disclosure. In this disclosure, schematic representations of the above terms do not necessarily refer to the same illustrative embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.
In the functional circuit applying the switching tube, a driving circuit is required to be arranged between the controller and the switching tube, so that the driving control signal output by the controller is amplified and then output (driving signal) to drive the switching tube to be conducted. However, due to improper design of the controller/driving circuit, external interference or degradation of device parameters, the driving signal reaching the switching tube may oscillate, as shown in the waveform diagram 100 of fig. 1. The drive signal is oscillated to cause the switching tube to be continuously turned on and off at high frequency in the conduction process, so that the switching tube is damaged due to overlarge loss.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention.
Fig. 2 is a schematic diagram of a first embodiment of the present invention, which shows a signal detection circuit 200 suitable for detecting a switching tube Q1. The signal detection circuit 200 includes a signal acquisition terminal 210, a first reference voltage source 220, a comparison circuit 230, and a signal output terminal 240. The signal acquisition end 210 is connected to the control end of the switching tube Q1, and is configured to acquire a driving control signal of the control end of the switching tube Q1. The first reference voltage source 220 is configured to provide a first reference voltage, which is less than or equal to the turn-on voltage of the switching transistor Q1. The comparison circuit 230 includes a first input terminal 231, a second input terminal 232, and a first output terminal 233, wherein the first input terminal 231 is connected to the signal acquisition terminal 210 to obtain a driving signal, and the second input terminal 232 is connected to the first reference voltage source 220 to obtain a first reference voltage. The comparison circuit 230 compares the voltage of the driving signal of the switching tube Q1 with the first reference voltage to detect the oscillation signal in the driving control signal. The first output end 233 of the comparison circuit 230 is connected to the signal output end 240, and is configured to output a detection signal corresponding to the oscillation signal.
The signal detection circuit in this embodiment is suitable for detecting a switching tube, for example, for a switching power supply circuit, compares a first reference voltage with a switching tube driving control signal from a switching tube control end through a comparison circuit, and when the switching tube driving control signal generates an oscillation signal, the comparison circuit can detect the oscillation signal in the switching tube driving control signal by outputting a detection signal corresponding to the oscillation signal because the trough voltage of the oscillation signal is lower than the first reference voltage. And outputs a signal indicative of the oscillation to a higher level circuit, such as a controller. The controller can thus make an adaptive adjustment, for example, to reduce the output power of the drive control signal, thereby reducing the current flowing through the switching tube and achieving the purpose of eliminating the oscillation.
As shown in fig. 3, in the second embodiment of the present invention, the comparing circuit 230 includes a first comparator U1, wherein a positive phase input terminal of the first comparator U1 is a first input terminal 231, a negative phase input terminal is a second input terminal 232, and an output terminal is a first output terminal 233. The comparison circuit 230 formed by the first comparator U1 has fewer peripheral elements, mature technology, and can reduce the cost of circuit development and production and improve the stability of the signal detection circuit.
As shown in fig. 4, in the third embodiment of the present invention, the first reference voltage source 220 includes a first voltage dividing circuit 221 and a first power input terminal 222, wherein the first power input terminal 222 is connected to the second input terminal 232 through the first voltage dividing circuit 221, and the input voltage is reduced and then supplied to the first comparator U1 as a first reference voltage, and the first reference voltage is equal to or less than the on voltage of the switching tube.
The following describes in detail the application of the signal detection circuit in a switching tube driving circuit.
As shown in the circuit diagram of fig. 5, a fourth embodiment of the present invention relates to a signal detection circuit 200, a switching circuit 300, and a controller 400. The switching circuit 300 includes a switching transistor Q1. A driving circuit (not shown in fig. 5) is generally further disposed between the controller 400 and the switching circuit 300, so that the driving control signal output by the controller 400 is amplified into a driving signal and then output to the switching tube Q1, and various functional circuits are realized by rapidly turning on/off the switching tube Q1. Since the driving circuit in this embodiment is common knowledge, the specific structure and principle thereof will not be described herein. In addition, an input terminal of the controller 400 is connected to the signal output terminal 240 of the signal detection circuit 200 to obtain a detection signal corresponding to the oscillation signal in the driving signal output by the signal detection circuit 200.
With continued reference to fig. 5, in this embodiment, a boost circuit is selected as an example of the switching circuit 300. The driving signal of the switching tube Q1 of the boost circuit 300 is introduced into the base electrode of the switching tube Q1 through the current limiting resistor R300. When the driving signal is high, the switching tube Q1 is conducted, and the inductor L300 stores energy; when the driving signal is at a low level, the switching tube Q1 is cut off, the inductor L300 discharges to the capacitor E300 through the diode D300, and the voltage at two ends of the capacitor E300 is increased, namely, the voltage which is output through the output end P+ and is added to the load can be higher than the input voltage V-IN, so that the switching boosting function is realized. Since the booster circuit 300 in this embodiment is of common general knowledge, the specific connection and principle of the components are not described here again.
With continued reference to fig. 5, the comparison circuit 230 shown in fig. 2 and 3 includes a first comparator U1, where a pin 5 (a positive end) of the first comparator U1 is a first input end 231, which is connected to a base of the switching tube Q1 through a current limiting resistor R231, and introduces a driving signal of the switching tube Q1. Pin 4 (negative side) of the first comparator U1 is a second input 232 connected to the first reference voltage source 220 for providing a first reference voltage. The first reference voltage source 220 shown in fig. 2 and fig. 4 includes a first voltage dividing circuit 221 and a first power input end 222, the first power input end 222 is introduced with +5v voltage, and the first voltage dividing circuit 221 formed by the resistors R221, R222 and the capacitor C221 is common knowledge and will not be described herein. Pin 3 of the first comparator U1 is connected to a +5V operating voltage, pin 2 (output end) is a first output end 233, and a pull-up resistor R232 is connected between the first output end 233 and pin 3 to output a high level when the voltage of pin 5 of the first comparator U1 is higher than that of pin 4. The capacitor C231 for reducing the interference signal is connected between the 3 and 4 pins of the first comparator U1.
As can be seen from the above, the driving signal of the switching tube Q1 is introduced into the comparator U1 through the current limiting resistor R231, and compared with the first reference voltage. The first reference voltage is related to a turn-off voltage threshold of the switching transistor Q1, which may be less than or equal to the turn-off voltage threshold of the switching transistor Q1. In this embodiment, the first reference voltage is equal to the off voltage threshold of the switching transistor Q1. In different embodiments, different reference voltages may be achieved by adjusting component parameters of the first reference voltage source 220. When the driving signal of the switching tube Q1 oscillates during the on process (the oscillation waveform is shown as a curve 100 in fig. 1), and when the oscillation trough occurs during the oscillation process and is lower than the threshold value of the off voltage of the switching tube Q301, the first comparator U1 triggers to output a pull-down signal, i.e. outputs a detection signal through the pin 2 thereof. It can be seen that the detection signal includes two states of a high level and a low level, and is used for reflecting the current state of the driving control signal of the switching tube, because the driving control signal is a frequency signal with alternating high and low levels, when the driving control signal is at the low level, the comparator U1 is triggered to output a pull-down signal, so that the controller 400 needs to combine the driving control signal condition output by itself to determine whether the detected oscillation signal is detected, after the controller 400 detects the pull-down signal, whether the driving control signal output currently is at the high level is confirmed, if the driving control signal is confirmed to be at the high level, the switching tube is confirmed to oscillate, and if the driving control signal is confirmed to be at the low level, the driving control signal is confirmed to be normal. After the switching oscillation occurs in the switching tube Q1 switching-on process, the output power of the driving control signal is reduced by reducing the duty ratio in the driving control signal, and the current flowing through the switching tube Q1 is reduced. Because the switch vibration is related to the current passing through the switching tube, after the current flowing through the switching tube Q1 is reduced, the switch vibration disappears, so that the vibration damage of the switching tube Q1 is avoided.
As shown in fig. 6, in the fifth embodiment of the present invention, the signal detection circuit 200 further includes a third input terminal 250 for connection to an output terminal of the controller 400. Since the output terminal of the controller 400 is used to send the driving control signal to the switching tube Q1, the signal detection circuit 200 can obtain the driving control signal through the third input terminal 250. A switch circuit 260 is disposed between the signal output terminal 250 and the first output terminal 233 of the comparison circuit 230, and a control terminal of the switch circuit 260 is connected to the third input terminal 250, so that the detection signal can be selectively output by controlling the conduction of the switch circuit 260 according to the level of the driving control signal. When the driving control signal is at a high level, the control switch circuit 260 is turned on, the signal output end 250 outputs a detection signal, when the driving control signal is at a low level, the control switch circuit 260 is turned off, and the signal output end 250 does not output the detection signal, so that the comparison circuit can avoid outputting the detection signal when the driving control signal is at the low level, the controller 400 can judge whether the switching tube oscillates or not only according to the presence or absence of the detection signal, and the controller 400 does not need to execute high-speed operation to judge the state of the switching tube, so that the hardware performance requirement of the controller 400 is reduced.
As shown in fig. 7, in the sixth embodiment of the present invention, the signal detection circuit 200 further includes a first delay circuit 270, and the first delay circuit 270 is disposed between the control terminal of the switch circuit 260 and the third input terminal 250. The switching circuit 260 includes a first switching tube Q260, an input terminal of the first switching tube Q260 is connected to the first output terminal 233, an output terminal of the first switching tube Q260 is connected to the signal output terminal 240, and a control terminal of the first switching tube Q260 is connected to the third input terminal 250 through a first delay circuit 270.
Specifically, as shown in fig. 8, the first delay circuit 270 in fig. 7 is configured to output a detection signal in synchronization with the conduction of the switching transistor Q1, which is an RC delay circuit composed of a resistor R270 and a capacitor C270. The first switching tube Q260 is an NPN transistor, wherein an input end of the RC delay circuit is connected to an output end of the controller 400, and an output end of the RC delay circuit is connected to a base electrode of the first switching tube Q105, that is, the driving control signal is introduced to delay the conduction of the transistor Q260. Specifically, the controller 400 outputs a high-level driving control signal to turn on the switching transistor Q1, and the base of the first switching transistor Q260 is also introduced with the driving control signal, so that the first switching transistor Q260 is also turned on during the turn-on process of the switching transistor Q301. However, in practical applications, the driving circuit 500 may have a delay time for amplifying the driving control signal, and the driving signal of the switching tube Q1 may be delayed from the conduction of the first switching tube Q260. By setting the first delay circuit 270 to delay the control signal, the on time of the first switching tube Q260 and the driving signal of the switching tube Q1 can be adjusted to be consistent, that is, the delay of the resistor R270 and the capacitor C270 to the detection signal is equal to the delay of the driving circuit to the amplifying process of the driving control signal. Therefore, when the control signal is at low level, the pull-down signal output by the comparator U1 does not enter the next stage.
Fig. 9 shows a schematic diagram of a seventh embodiment of the invention. The embodiment of fig. 9 differs from the embodiment of fig. 7 in that the embodiment of fig. 9 further includes a second delay circuit 280 that delays the detection signal. The second delay circuit 280 is disposed between the output terminal of the switching circuit 260 and the signal output terminal 240, and is configured to lengthen the time of the detection signal output from the first comparator U1.
Referring specifically to fig. 8, the second delay circuit 280 includes a second comparator U2, a second voltage divider circuit 281, and a second power supply input 282. The non-inverting input end (pin 8) of the second comparator U2 and the output end of the first switching tube Q260 introduce the comparison signal output by the first comparator U1. In this embodiment, the first switching tube Q260 is an NPN transistor, that is, the pin 8 of the second comparator U2 is connected to the collector of the first switching tube Q260. The negative input (pin 7) of the second comparator is connected to the second power input 282 through a second voltage divider circuit 281 to introduce a second reference voltage. The output (pin 6) of the second comparator U2 is connected to the signal output 240. The output (pin 6) of the second comparator U2 is also connected to a second power input 282 via an impedance element R280. The second delay circuit 280 further includes a first capacitor C280, where a first end of the first capacitor 280 is connected to the output end (pin 6) of the second comparator U2, and a second end of the first capacitor C280 is connected to the non-inverting input end (pin 8) of the second comparator U2.
In this embodiment, since the pull-down time of the oscillation of the switching tube Q1 is relatively short, the controller 400 may not detect the oscillation, so the second delay circuit 280 can lengthen the pull-down time of the output signal of the comparator U1 to ensure that the controller 400 can detect the pull-down signal. Specifically, as shown in fig. 8, when oscillation occurs during the switching process of the switching tube Q1, the output of the pin 2 of the first comparator U1 is triggered to be pulled down to 0V, the first switching tube Q260 is turned on, the input voltage of the pin 8 of the second comparator U2 is also 0V, which is lower than the voltage of the pin 7 of the second comparator U2, at this time, the output of the pin 6 of the second comparator U2 is pulled down to 0V, after the output of the first comparator U1 is pulled down and returns to the high level, the resistor R280 charges the capacitor C280, and when the charging voltage is higher than the voltage division value of the R282 and the resistor R283 (the R282 and the resistor R283 form the second voltage division circuit 281), the pin 2 of the second comparator U2 outputs the high level, thereby prolonging the pull-down time. After detecting the pull-down signal, the controller 400 determines that switching oscillation occurs in the switching-on process of the switching tube Q1, and reduces the output power of the driving control signal by reducing the duty ratio in the driving control signal, thereby reducing the current flowing through the switching tube Q1.
The embodiment of the invention also provides a switching tube driving control circuit, which comprises a switching tube Q1, a controller 400 and any of the signal detection circuits 200, wherein the output end of the controller 400 is electrically connected with the control end of the Q1 switching tube to provide a driving control signal for the switching tube Q1, the signal acquisition end 210 of the signal detection circuit 200 is connected with the control end of the switching tube Q1, and the signal output end 240 of the signal detection circuit 200 is connected with the input end of the controller 400.
The embodiment of the invention also provides a switching power supply, which comprises any of the signal detection circuits 200 or the switching tube driving control circuit.
The embodiment of the invention also provides a power factor correction circuit, which comprises any of the signal detection circuits 200 or the switching tube driving control circuit, and the power factor correction circuit adjusts the power factor of the whole circuit by utilizing the quick on-off of the switching tube Q1.
The embodiment of the invention also provides an air conditioner, which comprises any of the signal detection circuit 200, the switching tube driving control circuit, the switching power supply or the power factor correction circuit.
The switch power supply, the power factor correction circuit and the air conditioner all adopt all the technical schemes of all the embodiments, so that the switch power supply, the power factor correction circuit and the air conditioner have at least all the beneficial effects brought by the technical schemes of the embodiments, and are not repeated herein.
The embodiment of the invention also provides a switching tube driving control method which is applied to the switching tube driving control circuit, wherein the switching tube driving control circuit comprises the following components:
switching tube Q1, controller 400, and signal detection circuit 200. The output end of the controller 400 is electrically connected to the control end of the switching tube Q1, and provides a driving control signal for the switching tube Q1. The signal detection circuit 200 includes a comparison circuit 230 and a first reference voltage source 220, wherein the first reference voltage source 220 is configured to provide a first reference voltage to the comparison circuit 230, and the first reference voltage is less than or equal to a turn-on voltage of the switching tube Q1. Furthermore, the comparison circuit 230 comprises a first input 231, a second input 232 and a first output 233, wherein the first input 231 is connected to the control terminal of the switching tube Q1, the second input 232 is connected to the first reference voltage source, and the first output 233 is connected to the input of the controller 400. The comparing circuit 230 is configured to compare the voltage of the driving signal with the first reference voltage to detect the oscillation signal in the driving control signal. The first output terminal 233 is configured to output a detection signal corresponding to the oscillation signal.
The specific implementation of the switching tube driving control circuit can refer to the above description, and is not repeated here.
As shown in fig. 10, the switching tube driving control method includes the steps of:
step S100: acquiring a detection signal from the comparison circuit 200;
step S200: judging whether a driving control signal input to the control end of the switching tube Q1 has an oscillating signal or not according to the detection signal; and
step S300: and responding to the oscillation signal, and adjusting the driving control signal to reduce the output power of the switching tube Q1.
According to the switching tube driving control method provided by the embodiment of the invention, the controller 400 acquires the detection signal according to the signal detection circuit 200, the detection signal reflects whether the driving control signal of the control end of the switching tube has an oscillation signal or not, and the output power of the switch Q1 is reduced according to the adjustment of the output driving control signal in response to the oscillation signal, so that the switching tube Q1 is protected from being damaged due to the oscillation signal.
Specifically, step S300 includes reducing the duty cycle of the driving control signal in response to the oscillation signal, so as to reduce the current passing through the switching tube Q1, thereby reducing the occurrence of switching oscillation.
Referring to fig. 11, step S200 includes the steps of:
s201: acquiring the state of a currently output driving control signal;
s202: if the current driving control signal is at a high level and the current detection signal is at a low level, determining that the driving control signal at the control end of the switching tube Q1 has an oscillation signal.
Since the detection signal includes two states of high level and low level, and is used for reflecting the current state of the driving control signal of the switching tube, since the driving control signal is a frequency signal with alternating high level and low level, when the driving control signal is low level, the comparator U1 is triggered to output a pull-down signal, so in this embodiment, the controller 400 needs to combine the driving control signal condition output by itself to determine whether the detected oscillation signal, after the controller 400 detects the pull-down signal, whether the driving control signal output currently is high level is confirmed, if the driving control signal is confirmed to be high level, the switching tube is determined to oscillate, and if the driving control signal is confirmed to be low level, the driving control signal is determined to be normal. That is, the controller 400 needs to determine that the oscillation signal exists in the driving control signal at the control terminal of the switching tube Q1 when the driving control signal is at the high level and the detection signal is at the low level, and reduces the current flowing through the switching tube Q1 by reducing the output power of the driving control signal. Because the switch vibration is related to the current passing through the switching tube, after the current flowing through the switching tube Q1 is reduced, the switch vibration disappears, so that the vibration damage of the switching tube Q1 is avoided.
In another embodiment, the first output 233 is connected to an input of the controller 400 through the switching circuit 260, and a control terminal of the switching circuit 260 is connected to an output of the controller 400. The switching circuit 260 is configured to be turned on when the controller 400 outputs a high level. This embodiment is described in the above embodiments, and will not be described in detail herein.
Further, referring to fig. 12, step S200 includes the steps of:
s203: if the acquired detection signal is at a low level, it is determined that the oscillation signal exists in the driving control signal at the control end of the switching tube Q1.
In this embodiment, when the driving control signal is at a high level, the control switch circuit 260 is turned on, the signal output end 250 outputs the detection signal, when the driving control signal is at a low level, the control switch circuit 260 is turned off, the signal output end 250 does not output the detection signal, so that the comparison circuit can avoid outputting the detection signal when the driving control signal is at a low level, the controller 400 can judge whether the switching tube oscillates or not only according to the presence or absence of the detection signal, and the controller 400 does not need to perform high-speed operation to judge the state of the switching tube, thereby reducing the hardware performance requirement of the controller 400.
Fig. 13 is a control device 1300 provided in an embodiment of the present application, which includes a processor 1310, a memory 1320, and a computer program stored on the memory and executable on the processor, where the processor executes the program to implement any of the above-described switching tube driving control methods, for example, to perform the above-described method steps S100 to S300 in fig. 10, the method steps S201 to 202 in fig. 11, and the method step S203 in fig. 12.
Wherein the processor 1310 and the memory 1320 may be connected by a bus or otherwise, as exemplified in fig. 13 by a bus connection.
The embodiment of the invention also provides an air conditioner, which comprises the control device.
The embodiment of the invention also provides a computer readable storage medium, which stores computer executable instructions for executing the switching tube driving control method.
The computer-readable storage medium stores computer-executable instructions that are executed by one or more processors, for example, by one processor 1310 in fig. 13, which may cause the one or more processors to perform the circuit fault detection method in the above-described method embodiment, for example, perform the method steps S100 to S300 in fig. 10, the method steps S201 to 202 in fig. 11, and the method step S203 in fig. 12 described above.
The control device, the air conditioner and the computer readable storage medium described above are implemented by referring to the description of the method for controlling the driving of the switch tube, and are not described herein.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
It will be apparent that the above-described embodiments of the present disclosure are only some, but not all, embodiments of the invention. It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations may be made to these embodiments or implementations without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (7)
1. A switching tube driving control method applied to a switching tube driving control circuit, characterized in that the switching tube driving control circuit comprises:
a switching tube;
the output end of the controller is electrically connected with the control end of the switching tube and is used for providing a driving control signal for the switching tube;
the signal detection circuit comprises a comparison circuit and a first reference voltage source, wherein the first reference voltage source is used for providing a first reference voltage for the comparison circuit, and the first reference voltage is smaller than or equal to the conduction voltage of the switching tube;
the comparison circuit comprises a first input end, a second input end and a first output end, wherein the first input end is connected with the control end of the switching tube, the second input end is connected with the first reference voltage source, the first output end is connected with the input end of the controller, the comparison circuit is used for comparing the voltage of the driving control signal with the first reference voltage so as to detect an oscillation signal in the driving control signal, and the first output end is used for outputting a detection signal corresponding to the oscillation signal;
The method comprises the following steps:
acquiring a detection signal from the comparison circuit;
judging whether a driving control signal input to the control end of the switching tube has an oscillating signal or not according to the detection signal;
adjusting the drive control signal in response to the oscillation signal to reduce the output power of the drive control signal;
the method comprises the following steps of:
acquiring the state of a currently output driving control signal;
and if the current driving control signal is in a high level and the current detection signal is in a low level, judging that the driving control signal at the control end of the switching tube has an oscillating signal.
2. The switching tube driving control method according to claim 1, wherein the adjusting the driving control signal in response to the oscillation signal includes:
and responding to the oscillation signal, and reducing the duty ratio of the driving control signal.
3. A switching tube driving control method applied to a switching tube driving control circuit, characterized in that the switching tube driving control circuit comprises:
A switching tube;
the output end of the controller is electrically connected with the control end of the switching tube and is used for providing a driving control signal for the switching tube;
the signal detection circuit comprises a comparison circuit and a first reference voltage source, wherein the first reference voltage source is used for providing a first reference voltage for the comparison circuit, and the first reference voltage is smaller than or equal to the conduction voltage of the switching tube;
the comparison circuit comprises a first input end, a second input end and a first output end, wherein the first input end is connected with the control end of the switching tube, the second input end is connected with the first reference voltage source, the first output end is connected with the input end of the controller, the comparison circuit is used for comparing the voltage of the driving control signal with the first reference voltage so as to detect an oscillation signal in the driving control signal, and the first output end is used for outputting a detection signal corresponding to the oscillation signal;
the method comprises the following steps:
acquiring a detection signal from the comparison circuit;
judging whether a driving control signal input to the control end of the switching tube has an oscillating signal or not according to the detection signal;
Adjusting the drive control signal in response to the oscillation signal to reduce the output power of the drive control signal;
the first output end is connected with the input end of the controller through a switch circuit, the control end of the switch circuit is connected with the output end of the controller, and the switch circuit is configured to be conducted when the controller outputs a high level;
the step of judging whether the driving control signal input to the control end of the switching tube has an oscillation signal according to the detection signal comprises the following steps:
and if the acquired detection signal is in a low level, judging that the driving control signal of the control end of the switching tube has an oscillation signal.
4. A switching tube driving control method according to claim 3, wherein said adjusting said driving control signal in response to said oscillating signal comprises:
and responding to the oscillation signal, and reducing the duty ratio of the driving control signal.
5. A control apparatus comprising: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the switching tube driving control method according to any one of claims 1 to 4 when executing the program.
6. An air conditioner comprising the control device according to claim 5.
7. A computer-readable storage medium storing computer-executable instructions for performing the switching tube driving control method according to any one of claims 1 to 4.
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| CN102195495A (en) * | 2010-03-03 | 2011-09-21 | 比亚迪股份有限公司 | Switch power control circuit and switch power |
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| TWI395125B (en) * | 2009-07-14 | 2013-05-01 | Sonix Technology Co Ltd | Capacitive touch sensing circuit |
| JP5170117B2 (en) * | 2010-01-18 | 2013-03-27 | 株式会社村田製作所 | Switching control circuit and switching power supply device |
| US20120286750A1 (en) * | 2011-05-10 | 2012-11-15 | Peng Xu | Switching regulators with adaptive clock generators and associated methods of control |
| CN104363013B (en) * | 2014-09-02 | 2018-06-08 | 中国科学院国家授时中心 | A kind of FV convertor of low additional noise |
| CN104811174B (en) * | 2015-05-15 | 2017-12-26 | 上海新时达电气股份有限公司 | The power switch tube drives circuit of regulating power switching tube switching speed |
| CN105226943B (en) * | 2015-07-07 | 2018-07-31 | 深圳创维－Rgb电子有限公司 | Supply convertor and switching power unit |
| CN109245053A (en) * | 2018-08-30 | 2019-01-18 | 广州金升阳科技有限公司 | A kind of overload protecting circuit |
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