Reset control circuit and its control method, air conditioning unit

Abstract

This invention discloses a reset control circuit and its control method, as well as an air conditioning unit. The reset control circuit includes: a reset circuit comprising a reset resistor and a reset capacitor connected in series, the connection point of which is connected to a reset signal output port for outputting a reset control signal; and a control circuit connected to the reset circuit for short-circuiting the reset resistor after the reset circuit is powered on and reset. This invention solves the problem of inability to reset normally when components in the reset circuit malfunction, thus improving the stability of the reset circuit.

Description

Technical Field

[0001] This invention relates to the field of circuit technology, and more specifically, to a reset control circuit and its control method, and an air conditioning unit. Background Technology

[0002] Currently, in the review of after-sales issues of air conditioners, reset abnormalities are frequently encountered, and the cause of these abnormalities is mostly due to a faulty or damaged reset capacitor. Existing air conditioner circuits all contain a microprocessor (MCU), and ensuring the MCU's reset is crucial for the normal operation of the unit.

[0003] The reset control circuit in the prior art usually uses detection control to reset. However, this control circuit can only control the reset when the components of the reset control circuit are normal. It cannot reset when the components of the reset control circuit fail, such as when the reset capacitor fails. Therefore, it cannot guarantee that the unit reset will not be affected.

[0004] There is currently no effective solution to the problem of the inability to reset properly when the reset circuit components fail in related technologies. Summary of the Invention

[0005] This invention provides a reset control circuit and its control method, as well as an air conditioning unit, to at least solve the problem of failure to reset normally when the reset circuit components malfunction in the prior art.

[0006] To solve the above-mentioned technical problems, according to one aspect of the present invention, a reset control circuit is provided, comprising: a reset circuit including a reset resistor and a reset capacitor connected in series, the connection point of the reset resistor and the reset capacitor being connected to a reset signal output port for outputting a reset control signal; and a control circuit connected to the reset circuit for short-circuiting the reset resistor after the reset circuit is powered on and reset.

[0007] Furthermore, the first end of the reset resistor is connected to the reset power supply, the second end of the reset resistor is connected to the first end of the reset capacitor, and the second end of the reset capacitor is grounded.

[0008] Furthermore, the control circuit includes a shorting circuit connected in parallel with the reset resistor, used to short-circuit the reset resistor after the reset circuit is powered on and reset.

[0009] Furthermore, the short-circuit circuit includes: a first transistor, the emitter of the first transistor is connected to the first end of the reset resistor, the collector of the first transistor is connected to the second end of the reset resistor, the base of the first transistor is grounded, the first transistor conducts after power-on, and the reset resistor is short-circuited.

[0010] Furthermore, the control circuit also includes a microprocessor connected to the shorting circuit, used to output a control signal after the reset circuit is powered on and reset, to control the shorting circuit to short-circuit the reset resistor.

[0011] Furthermore, the short-circuit circuit includes: a first transistor, the emitter of which is connected to the first terminal of the reset resistor, and the collector of which is connected to the second terminal of the reset resistor; a second transistor, the emitter of which is grounded, and the collector of which is connected to the base of the first transistor, and the base of which is connected to the microprocessor; after the microprocessor is powered on and reset by the reset circuit, the control signal output by the microprocessor is high level, controlling the second transistor to conduct, and at the same time the first transistor conducts, short-circuiting the reset resistor.

[0012] Furthermore, the control circuit also includes a detection circuit, one end of which is connected to the microprocessor and the other end of which is connected to the reset signal output port, for detecting the reset control signal; the microprocessor is used to determine that the reset circuit is powered on and reset when the reset control signal is high, and then outputs the control signal.

[0013] Furthermore, the reset circuit also includes: a clamping diode connected in parallel with the reset resistor; a filter capacitor connected in parallel with the reset capacitor; the shorting circuit also includes: a pull-up resistor, one end of which is connected to the emitter of the first transistor and the other end of which is connected to the base of the first transistor; a first current-limiting resistor, one end of which is connected to the base of the first transistor and the other end of which is connected to the collector of the second transistor; a second current-limiting resistor, one end of which is connected to the microprocessor and the other end of which is connected to the base of the second transistor; the detection circuit includes: a third current-limiting resistor, one end of which is connected to the microprocessor and the other end of which is connected to the reset signal output port.

[0014] According to another aspect of the present invention, a control method for a reset control circuit is provided, applied to the reset control circuit as described above, the method comprising:

[0015] Check if the reset circuit resets upon power-up;

[0016] After the reset circuit is powered on and reset, the reset resistor controlling the reset circuit is short-circuited.

[0017] Furthermore, the reset resistor of the control reset circuit is short-circuited, including:

[0018] The microprocessor in the control circuit outputs a high-level signal to control the short-circuit circuit to conduct, thus short-circuiting the reset resistor.

[0019] Furthermore, before detecting whether the reset circuit has been powered on and reset, the following steps are also included:

[0020] When the reset circuit is powered on, the microprocessor of the control circuit outputs a low-level signal to control the short-circuit circuit to cut off, thus preventing the reset resistor from being short-circuited.

[0021] According to another aspect of the present invention, an air conditioning unit is provided, including the reset control circuit as described above.

[0022] According to another aspect of the present invention, a storage medium containing computer-executable instructions is provided, which, when executed by a computer processor, are used to perform a control method for a reset control circuit as described above.

[0023] This invention provides a controllable circuit that short-circuits the reset resistor in the reset circuit, including a reset circuit and a control circuit. This circuit enables the short-circuiting of the resistor in the reset circuit after the unit completes its power-on reset. Compared to traditional reset control circuits, this avoids the reset capacitor from affecting the reset circuit and causing abnormal unit reset when it fails, thus ensuring the normal operation of the unit. It effectively solves the problem of inability to reset normally when components in the reset circuit fail, and improves the stability of the reset circuit. Attached Figure Description

[0024] Figure 1 This is an optional circuit diagram of the reset control circuit according to an embodiment of the present invention;

[0025] Figure 2 This is an optional flowchart of a control method for a reset control circuit according to an embodiment of the present invention;

[0026] Figure 3 This is another optional flowchart of the control method for the reset control circuit according to an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0029] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0030] It should be understood that although the terms first, second, third, etc., may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of embodiments of the present invention, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller.

[0031] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0032] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0033] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0034] Example 1

[0035] In a preferred embodiment 1 of the present invention, a reset control circuit is provided, specifically... Figure 1 An alternative circuit diagram of the reset control circuit is shown, such as... Figure 1 As shown, the reset control circuit includes:

[0036] The reset circuit includes a reset resistor R4 and a reset capacitor C2 connected in series. The connection point of the reset resistor R4 and the reset capacitor C2 is connected to the reset signal output port for outputting the reset control signal MCU-RST.

[0037] The control circuit, connected to the reset circuit, is used to short-circuit the reset resistor after the reset circuit is powered on and reset.

[0038] In the above embodiments, a controllable circuit for short-circuiting the reset resistor in the reset circuit is provided. The circuit includes a reset circuit and a control circuit. After the unit completes the power-on reset, the resistor in the reset circuit is short-circuited. Compared with the traditional reset control circuit, when the reset capacitor fails, it can prevent the reset capacitor from affecting the reset circuit and causing abnormal unit reset, thereby ensuring the normal operation of the unit. This effectively solves the problem of the reset circuit failing to reset normally when the components fail in the prior art, and improves the stability of the reset circuit.

[0039] The first terminal of the reset resistor R4 is connected to the reset power supply VCC, and the second terminal of the reset resistor R4 is connected to the first terminal of the reset capacitor C2. The second terminal of the reset capacitor C2 is grounded. The reset circuit also includes: a clamping diode D1, connected in parallel with the reset resistor R4; and a filter capacitor C1, connected in parallel with the reset capacitor C2. Figure 1 As shown, a typical reset circuit consists of Figure 1 The circuit shown, consisting of R4, C1, C2, and D1, forms a high-level active reset circuit. R1 and C2 work together to control the rising slope of the RST signal, i.e., the reset duration of the MCU. The reset duration is calculated using the formula t = R1 * C2, and its selection must meet the MCU's reset requirements. C1 and D1 serve as filters and protection; their inclusion in the circuit can be determined based on specific needs.

[0040] The control circuit includes a shorting circuit connected in parallel with the reset resistor, used to short-circuit the reset resistor after the reset circuit is powered on and reset. The shorting circuit can take various forms, primarily used to implement the function of shorting the reset resistor. Optionally, the shorting circuit includes a first transistor Q1, with its emitter connected to the first terminal of the reset resistor, its collector connected to the second terminal of the reset resistor, and its base grounded. The first transistor conducts after power-on, shorting the reset resistor. That is, the above shorting circuit does not include... Figure 1 The content within the dashed box includes only the first transistor Q1 and resistors R5 and R1. R1 is connected to the second transistor Q2 and grounded. When the unit is powered on, the first transistor Q1 conducts. At this time, resistor R4 in the reset circuit is directly shorted, and the MCU-RST level is pulled high and exceeds the minimum reset level VIL. MCU-RST is the MCU's reset terminal, forcing the MCU to reset. In this implementation, regardless of whether the reset capacitor is faulty, the MCU can be reset upon power-on.

[0041] In another optional embodiment of the present invention, the control circuit further includes: a microprocessor connected to the shorting circuit, used to output a control signal after the reset circuit is powered on and reset, to control the shorting circuit to short-circuit the reset resistor. Figure 1As shown, the microprocessor refers to the MCU. As mentioned earlier, MCU-RST is the reset pin of the MCU. Here, the microprocessor can be the MCU being reset or another processor. When the detection circuit detects that MCU-RST is high, it can determine whether a power-on reset has occurred. If the MCU connected to the MCU-RST port is the same component, then only the level of the MCU-RST port needs to be obtained to determine whether a power-on reset has occurred.

[0042] Specifically, such as Figure 1 As shown, the shorting circuit includes: a first transistor Q1, whose emitter is connected to the first terminal of the reset resistor, and whose collector is connected to the second terminal of the reset resistor; a second transistor Q2, whose emitter is grounded, and whose collector is connected to the base of the first transistor, and whose base is connected to the microprocessor; after the microprocessor powers on and resets the circuit, the output control signal is high, controlling the second transistor to conduct, and simultaneously the first transistor conducts, shorting the reset resistor R4. This shorting circuit is a transistor control circuit, its function being to control the shorting of the reset resistor. Circuits with similar functions, or with some modifications and variations, can achieve the same result as long as the reset resistor is shorted when the output control signal of the reset circuit powers on and resets the circuit.

[0043] In conjunction with the microprocessor, the control circuit also includes a detection circuit, one end of which is connected to the microprocessor (MCU-AD) and the other end of which is connected to the reset signal output port (MCU-RST), used to detect the reset control signal; the microprocessor is used to determine that the reset circuit is powered on and reset when the reset control signal is high, and then outputs the control signal.

[0044] In the above embodiments, as shown in the appendix Figure 1 As shown, the reset control circuit of this invention consists of a general reset circuit, an AD detection port, and a transistor control circuit. Its function is to short-circuit the reset resistor in the reset circuit after the unit completes the power-on reset, so that the reset signal is not affected by the reset capacitor, thus ensuring the normal operation of the unit.

[0045] Optionally, the shorting circuit further includes: a pull-up resistor R5, one end of which is connected to the emitter of the first transistor and the other end of which is connected to the base of the first transistor; a first current-limiting resistor R1, one end of which is connected to the base of the first transistor and the other end of which is connected to the collector of the second transistor; a second current-limiting resistor R2, one end of which is connected to the microprocessor and the other end of which is connected to the base of the second transistor; the detection circuit includes: a third current-limiting resistor R3, one end of which is connected to the microprocessor and the other end of which is connected to the reset signal output port.

[0046] like Figure 1As shown, Q1, Q2, R5, R1, and R2 form a transistor control circuit. Q2 is an NPN transistor, and Q1 is a PNP transistor. The base (Q2-b) of Q2 is connected to the MCU's I / O port through the current-limiting resistor R2, the emitter (Q2-e) is grounded, and the collector (Q2-c) is connected to the base of Q1 through resistor R1. The emitter (Q1-e) of Q1 is directly connected to VCC, the base (Q1-b) is connected to VCC through the pull-up resistor R5, and the collector (Q1-c) is connected to the RST signal terminal and the AD detection port. The current at the base of transistor Q1 can be controlled by adjusting the resistance values ​​of R5 and R1, and the current at the collector of Q2 can be controlled by adjusting the resistance value of R2. Therefore, the values ​​of Q2, Q1, R5, R1, and R2 must ensure that when the MCU_RST_CONTROL output is high, the base current of Q2 does not exceed the output capability of the MCU's I / O port, and both transistors can conduct normally.

[0047] By employing the transistor control circuit and AD detection of this invention, and utilizing the conduction characteristics of the transistor, the resistor in the reset circuit is short-circuited after the unit completes the power-on reset state, thus avoiding reset abnormalities when the reset capacitor fails.

[0048] Example 2

[0049] In a preferred embodiment 2 of the present invention, a control method for a reset control circuit is provided, which is applied to the reset control circuit in embodiment 1 above. Specifically, Figure 2 An optional flowchart of the method is shown, such as Figure 2 As shown, the method includes the following steps S202-S204:

[0050] S202: Detect whether the reset circuit is powered on and reset;

[0051] S204: After the reset circuit is powered on and reset, the reset resistor of the control reset circuit is short-circuited.

[0052] In the above implementation, after the unit completes the power-on reset, the resistor in the reset circuit is short-circuited. Compared with the traditional reset control circuit, when the reset capacitor fails, it can prevent the reset circuit from being affected and causing abnormal unit reset, thereby ensuring the normal operation of the unit. This effectively solves the problem of the reset circuit failing to reset normally when the components fail in the prior art, and improves the stability of the reset circuit.

[0053] Specifically, controlling the short-circuiting of the reset resistor in the reset circuit includes: controlling the short-circuiting circuit to conduct by outputting a high-level signal through the microprocessor of the control circuit, thereby short-circuiting the reset resistor.

[0054] Before detecting whether the reset circuit is powered on and reset, the following steps are also included: when the reset circuit is powered on and reset, the microprocessor of the control circuit outputs a low-level signal to control the short-circuit circuit to be cut off, so as to avoid short-circuiting the reset resistor.

[0055] In a preferred embodiment 2 of the present invention, another control method for the reset control circuit is also provided. Specifically... Figure 3 An optional flowchart of the method is shown, such as Figure 3 As shown, the method includes the following steps S302-S310:

[0056] S302: Unit powered on;

[0057] S304: The MCU is reset. At this time, MCU_RST_CONTROL outputs a low level, and the transistor cannot be turned on.

[0058] S306: MCU_AD detects the RST signal;

[0059] S308: Is the level high? If yes, proceed to S310; otherwise, proceed to S306.

[0060] S310: Controls MCU_RST_CONTROL to output a high level, turns on the transistor, and shorts the reset resistor R1.

[0061] When the unit is powered on, a normal reset operation is performed. The MCU_RST_CONTROL output is low, transistors Q1 and Q2 are cut off, and the reset resistor R4 is not shorted. The MCU_AD detects the level of the RST signal. Due to the non-instantaneous voltage characteristic of capacitors, at the moment of power-on, the reset capacitor C2 does not charge, and its voltage is zero, so MCU_RST is low. Next, VCC charges C2 through resistor R4 until the RST voltage reaches VCC, and the circuit enters normal operating mode. Once the circuit enters normal operating mode, the MCU_AD detects that the RST signal is high, and then controls the MCU_RST_CONTROL output to be high. Transistor Q2 conducts, and Q1 conducts simultaneously. MCU_RST is directly connected to VCC through Q1, and resistor R4 is shorted. The AD detection of the RST signal will remain high. Subsequent damage or malfunction of the reset capacitor will not affect MCU_RST.

[0062] In the above implementation, after the unit completes the power-on reset, the resistor in the reset circuit is short-circuited. Compared with the traditional reset control circuit, when the reset capacitor fails, it can prevent the reset circuit from being affected and causing abnormal unit reset, thereby ensuring the normal operation of the unit. This effectively solves the problem of the reset circuit failing to reset normally when the components fail in the prior art, and improves the stability of the reset circuit.

[0063] Example 3

[0064] Based on the reset control circuit provided in Embodiment 1 above, an air conditioning unit is also provided in a preferred embodiment 3 of the present invention, including the reset control circuit as described in Embodiment 1 above.

[0065] In the above embodiments, a controllable circuit for short-circuiting the reset resistor in the reset circuit is provided. The circuit includes a reset circuit and a control circuit. After the unit completes the power-on reset, the resistor in the reset circuit is short-circuited. Compared with the traditional reset control circuit, when the reset capacitor fails, it can prevent the reset capacitor from affecting the reset circuit and causing abnormal unit reset, thereby ensuring the normal operation of the unit. This effectively solves the problem of the reset circuit failing to reset normally when the components fail in the prior art, and improves the stability of the reset circuit.

[0066] Example 4

[0067] Based on the control method of the reset control circuit provided in Embodiment 2 above, in the preferred embodiment 4 of the present invention, a storage medium containing computer-executable instructions is also provided. When the computer-executable instructions are executed by a computer processor, they are used to execute the control method of the reset control circuit as described above.

[0068] In the above embodiments, a controllable circuit for short-circuiting the reset resistor in the reset circuit is provided. The circuit includes a reset circuit and a control circuit. After the unit completes the power-on reset, the resistor in the reset circuit is short-circuited. Compared with the traditional reset control circuit, when the reset capacitor fails, it can prevent the reset capacitor from affecting the reset circuit and causing abnormal unit reset, thereby ensuring the normal operation of the unit. This effectively solves the problem of the reset circuit failing to reset normally when the components fail in the prior art, and improves the stability of the reset circuit.

[0069] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0070] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A reset control circuit, characterized by comprising: include: A reset circuit includes a reset resistor and a reset capacitor connected in series. The first end of the reset resistor is connected to a reset power supply, the second end of the reset resistor is connected to the first end of the reset capacitor, the second end of the reset capacitor is grounded, and the connection point of the reset resistor and the reset capacitor is connected to a reset signal output port for outputting a reset control signal. A control circuit, comprising a shorting circuit and a microprocessor, wherein the shorting circuit is connected in parallel with the reset resistor and is used to short the reset resistor after the reset circuit is powered on and reset. The microprocessor is connected to the shorting circuit and is used to output a control signal after the reset circuit is powered on and reset, to control the shorting circuit to short-circuit the reset resistor; The short-circuit circuit includes: a first transistor, the emitter of which is connected to the first end of the reset resistor, and the collector of which is connected to the second end of the reset resistor; The second transistor has its emitter grounded, its collector connected to the base of the first transistor, and its base connected to the microprocessor. After the microprocessor is powered on and reset by the reset circuit, the control signal output by it is at a high level, which controls the second transistor to turn on. At the same time, the first transistor turns on and shorts the reset resistor.

2. The reset control circuit of claim 1, wherein The control circuit also includes: The detection circuit has one end connected to the microprocessor and the other end connected to the reset signal output port, and is used to detect the reset control signal. The microprocessor is used to determine that the reset circuit is powered on and reset when the reset control signal is high, and then outputs the control signal.

3. The reset control circuit according to claim 2, characterized in that, The reset circuit further includes: a clamping diode connected in parallel with the reset resistor; and a filter capacitor connected in parallel with the reset capacitor; The shorting circuit further includes: a pull-up resistor, one end of which is connected to the emitter of the first transistor and the other end of which is connected to the base of the first transistor; a first current-limiting resistor, one end of which is connected to the base of the first transistor and the other end of which is connected to the collector of the second transistor; and a second current-limiting resistor, one end of which is connected to the microprocessor and the other end of which is connected to the base of the second transistor. The detection circuit includes a third current-limiting resistor, one end of which is connected to the microprocessor and the other end of which is connected to the reset signal output port.

4. A control method of a reset control circuit applied to the reset control circuit according to any one of claims 1 to 3, characterized by, The method includes: Check if the reset circuit resets upon power-up; After the reset circuit is powered on and reset, the reset resistor controlling the reset circuit is short-circuited.

5. The method of claim 4, wherein, Controlling the short-circuiting of the reset resistor in the reset circuit includes: The microprocessor of the control circuit outputs a high-level signal to control the short-circuit circuit to conduct, thereby short-circuiting the reset resistor.

6. The method of claim 5, wherein, Before detecting whether the reset circuit has been powered on and reset, the following steps are also included: When the reset circuit is powered on and reset, the microprocessor of the control circuit outputs a low-level signal to control the short-circuit circuit to be cut off, thereby preventing the reset resistor from being short-circuited.

7. An air conditioning unit characterized by, Includes the reset control circuit as described in any one of claims 1 to 3.

8. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the control method of the reset control circuit as described in any one of claims 4 to 6.

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