CN210624841U - Reset circuit, control circuit and air conditioner - Google Patents
Reset circuit, control circuit and air conditioner Download PDFInfo
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- CN210624841U CN210624841U CN201921291699.6U CN201921291699U CN210624841U CN 210624841 U CN210624841 U CN 210624841U CN 201921291699 U CN201921291699 U CN 201921291699U CN 210624841 U CN210624841 U CN 210624841U
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Abstract
The utility model provides a reset circuit for reset to the controller, include: the voltage division circuit is connected with a power supply; the isolation circuit is connected with the voltage division circuit and the power supply; and the input end of the output circuit is connected with the isolation circuit, and the output end of the output circuit is connected with the reset pin of the controller. Through above-mentioned structure, isolating circuit plays the isolation, and the singlechip passes through isolating circuit and connects the power, and isolating circuit can prevent the electrostatic breakdown, improves reset circuit's reliability, for the singlechip provides the protection, improves the antistatic effect of singlechip.
Description
Technical Field
The utility model relates to an air conditioner technical field particularly, relates to a reset circuit, control circuit and air conditioner.
Background
For the single chip microcomputer, the program running disorder can be caused by the excessively low power supply voltage, and even the single chip microcomputer is damaged, so that the single chip microcomputer is generally connected with a reset circuit with low-voltage protection to monitor the power supply voltage. When the power supply voltage is reduced to be out of the working voltage range, the reset circuit unit generates a reset signal to stop the operation of the singlechip and return to the initial state.
At present, the reset circuit mostly adopts an RC loop. The RC circuit has weak anti-interference capability, and is easy to generate false triggering when being interfered. Meanwhile, the RC circuit is weak in antistatic capacity, so that the breakdown of an internal circuit of the single chip microcomputer is easily caused, and irreversible damage is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a problem how improve the reset circuit reliability, prevent the electrostatic breakdown, strengthen the protection to the singlechip.
In order to solve the above problem, the utility model provides a reset circuit for reset to the controller, include:
the voltage division circuit is connected with a power supply;
the isolation circuit is connected with the voltage division circuit and the power supply;
and the input end of the output circuit is connected with the isolation circuit, and the output end of the output circuit is connected with the reset pin of the controller.
Through above-mentioned structure, isolating circuit plays the isolation, and the singlechip passes through isolating circuit and connects the power, and isolating circuit can prevent the electrostatic breakdown, improves reset circuit's reliability, for the singlechip provides the protection, improves the antistatic effect of singlechip.
The embodiment of the utility model provides an in, isolating circuit receive mains voltage with the partial pressure voltage of bleeder circuit output, according to mains voltage with partial pressure voltage's relation, output mains voltage or reset signal.
In an embodiment of the present invention, the isolation circuit includes: PNP triode.
In an embodiment of the utility model, the PNP triode projecting pole connects the power, and the base connects bleeder circuit's output, collecting electrode connect output circuit the input.
The embodiment of the utility model provides an in, work as mains voltage is located when the operating voltage within range of controller, mains voltage with partial voltage makes the PNP triode is in the saturated condition, the voltage of collecting electrode is mains voltage, mains voltage warp output circuit outputs.
The embodiment of the utility model provides an in, work as supply voltage is less than during the operating voltage scope of controller, supply voltage with partial voltage makes the PNP triode is in the off-state, the voltage of collecting electrode is as reset signal, reset signal warp output circuit exports.
In an embodiment of the present invention, the voltage dividing ratio of the voltage dividing circuit is adjustable.
Through the structure, the single-chip microcomputer control circuit can be suitable for various single-chip microcomputers, and is high in universality.
In an embodiment of the present invention, the voltage dividing circuit includes: and the two voltage division resistors adjust the voltage division ratio of the voltage division circuit by adjusting the resistance values of the two voltage division resistors.
In an embodiment of the present invention, the reset signal is reduced to zero after a predetermined time.
In an embodiment of the present invention, the collector electrode is grounded via a first resistor; the output circuit includes: a second resistor and a capacitor;
the first end of the second resistor is connected with the collector;
one end of the capacitor is grounded, and the other end of the capacitor is connected with the other end of the second resistor and is used as the output end of the output circuit;
the predetermined time is equal to the product of the sum of the resistance value of the first resistor and the resistance value of the second resistor and the capacitance value of the capacitor.
In the embodiment of the present invention, the method further comprises: and the anti-interference circuit is connected with the power supply.
In an embodiment of the present invention, the anti-jamming circuit includes: and one end of the filter capacitor is connected with the power supply, and the other end of the filter capacitor is grounded.
The utility model also provides a control circuit, which comprises a controller and the reset circuit; the reset circuit is connected with a reset pin of the controller.
In an embodiment of the present invention, the controller is a single chip microcomputer.
The utility model also provides an air conditioner, include: the control circuit is provided.
Drawings
Fig. 1 is a block diagram of a reset circuit according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a reset circuit according to an embodiment of the present invention.
Description of reference numerals:
VCC-power supply; Q1-PNP triode; r1-first divider resistor, R2-second divider resistor; r3 — first resistance; r4 — second resistance; c1-capacitance; GND-ground; b-base electrode; an E-emitter; c-a collector; Reset-Reset signal.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
An embodiment of the utility model provides a reset circuit, as shown in fig. 1, this reset circuit connects between power and controller for reset the controller. The reset circuit of the embodiment includes: bleeder circuit, isolation circuit, output circuit.
In this embodiment, the reset circuit is described by taking a single chip as an example, but the utility model is not limited thereto, and the controller may be any chip with a reset function, and the chips include but are not limited to: CPU, DSP, FPGA and other processors.
In the reset circuit of this embodiment, the input terminal of the voltage dividing circuit is connected to the power supply, and the output terminal is connected to the isolation circuit, so as to divide the power supply voltage. The power supply voltage is input into the voltage division circuit through the input end of the voltage division circuit, the voltage division circuit divides the power supply voltage, and the divided voltage is output through the output end of the voltage division circuit.
The isolation circuit is connected with the voltage division circuit and the power supply. The isolation circuit has two inputs: a first input terminal and a second input terminal. The first input end is connected with the power supply, and the second input end is connected with the output end of the voltage division circuit.
The power supply voltage and the divided voltage are respectively input into the isolation circuit through the first input end and the second input end, and the isolation circuit outputs the power supply voltage or a reset signal according to the relation between the power supply voltage and the divided voltage.
Specifically, the method comprises the following steps:
when the power supply voltage is within the working voltage range of the single chip microcomputer, the fact that the power supply voltage can enable the single chip microcomputer to normally work is shown, the single chip microcomputer does not need to reset, the power supply voltage and the divided voltage meet a first relation at the moment, and the output end of the isolation circuit outputs the power supply voltage.
When the power supply voltage is lower than the working voltage range of the single chip microcomputer, the fact that the power supply voltage cannot enable the single chip microcomputer to normally work is indicated, the single chip microcomputer needs to be reset, the power supply voltage and the divided voltage meet a second relation, and the output end of the isolation circuit outputs a reset signal.
Meanwhile, the isolation circuit plays an isolation role, the single chip microcomputer is connected with the power supply through the isolation circuit, the isolation circuit can prevent electrostatic breakdown, reliability of the reset circuit is improved, protection is provided for the single chip microcomputer, and antistatic capacity of the single chip microcomputer is improved.
The input end of the output circuit is connected with the isolation circuit, and the output end of the output circuit is connected with the reset pin of the single chip microcomputer and used for transmitting the power supply voltage or the reset signal output by the isolation circuit to the reset pin of the single chip microcomputer.
The input end of the output circuit is connected with the output end of the isolation circuit, when the power supply voltage is within the working voltage range of the single chip microcomputer, the output end of the isolation circuit transmits the power supply voltage to the input end of the output circuit, and the output circuit transmits the power supply voltage to the reset pin of the single chip microcomputer. When the power supply voltage is lower than the working voltage range of the single chip microcomputer, the output end of the isolation circuit transmits the reset signal to the input end of the output circuit, and the output circuit transmits the reset signal to the reset pin of the single chip microcomputer.
The reset pin of the singlechip is connected with the output end of the output circuit. When the output end of the output circuit outputs the power supply voltage, the reset pin of the single chip microcomputer is at a high level, and the single chip microcomputer works normally. When the output end of the output circuit outputs a reset signal, the reset pin of the singlechip is at low level, and the singlechip is reset.
As shown in fig. 2, in the reset circuit of the present embodiment, the voltage dividing circuit is a resistance voltage dividing circuit, and the resistance voltage dividing circuit includes: first and second voltage dividing resistors: r1 and R2. The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are connected in series between the power source VCC and the ground GND. One end of the first voltage-dividing resistor R1, which is connected with the power supply VCC, is an input end of the voltage-dividing circuit, and the connection end of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 is an output end of the voltage-dividing circuit.
In the reset circuit of the present embodiment, the divided voltage output by the voltage dividing circuit is determined by the resistance values of the first voltage dividing resistor R1 and the second voltage dividing resistor R2, that is, the following formula is satisfied:
where Vcc is the supply voltage, VIs divided intoIs a divided voltage, R1Is the resistance value of the resistor R1, R2Is the resistance value of the resistor R2,
is the voltage division ratio of the voltage division circuit.
Taking fig. 2 as an example, the power supply voltage Vcc is 5V, that is, the operating voltage of the single chip microcomputer is 5V. R1Is 2K ohm, R2At 10K ohm, the divided voltage
By selecting different first voltage-dividing resistor R1 and second voltage-dividing resistor R2, the resistance value R of the voltage-dividing resistor1、R2The voltage division ratio of the voltage division circuit can be adjusted to obtain different voltage division voltages. Therefore, the method is suitable for various single-chip microcomputers and has strong universality.
As shown in fig. 2, in the reset circuit of the present embodiment, the isolation circuit includes: a PNP transistor Q1. The base B of the triode Q1 is connected with the output end of the voltage division circuit, the emitter E is connected with the power supply VCC, and the collector C is grounded GND through the resistor R3 and is connected with the output circuit.
In the isolation circuit of this embodiment, when the transistor Q1 is in saturation, the short circuit is formed between the emitter E and the collector C, and the voltage of the collector C can be considered to be equal to the voltage of the emitter E. When the triode is in an off state, the connection between the emitter E and the collector C is equivalent to an open circuit, and the voltage of the collector C can be considered to be equal to zero. The present embodiment utilizes the above-mentioned characteristics of the triode, and the triode is used as a switch to generate the power voltage or the Reset signal Reset to the single chip according to the numerical relationship between the power voltage and the divided voltage.
As shown in fig. 2, in the reset circuit of the present embodiment, the base B of the triode is connected to the output terminal of the voltage divider circuit, so that the voltage V at the base BBIs equal to the divided voltage VIs divided intoThe emitter E is connected to a power supply VCC, so the emitter E voltage is equal to the power supply VCC. If the voltage of the power supply VCC is unstable and the voltage of the power supply changes, the voltage of the emitter E of the transistor Q1 will change accordingly. Meanwhile, the voltage dividing circuit divides the power supply voltage, so the divided voltage also changes. Thus, the base B voltage and the emitter E voltage of the transistor Q1 change, i.e., the numerical relationship between them changes. By selecting the resistance values of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, the triode Q1 is in a saturated state when the power supply voltage is within the working voltage range of the single chip microcomputer, and the triode Q1 is in a cut-off state when the power supply voltage is lower than the working voltage range of the single chip microcomputer. The output terminal of the isolation circuit, i.e. the collector C of the transistor Q1, exhibits different voltage values and outputs the voltageThe path is sent to the singlechip.
In the example of fig. 2, the switching voltage of the PNP transistor Q1 between the saturation state and the cut-off state is considered to be 0.8V, i.e., when the emitter junction voltage drop of the transistor Q1 is greater than 0.8V, the transistor Q1 is considered to be in the saturation state, and when the emitter junction voltage drop of the transistor Q1 is less than 0.8V, the transistor Q1 is considered to be in the cut-off state.
When the power supply voltage Vcc is 5V stable, R1Is 2K ohm, R2At 10K ohm, the divided voltage
Namely, the voltage of the base B of the transistor Q1 is 4.16V, the voltage of the emitter E is 5V, the emitter drop of the transistor Q1 is 5-4.16-0.84V, namely, the emitter drop is greater than 0.8V, at this time, the transistor Q1 is in a saturation state, the drop between the emitter E and the collector C is extremely small, and the voltage of the collector C is equal to the voltage of the emitter E and is equal to the power supply voltage when the emitter E and the collector C are considered to be short-circuited.
When the power supply VCC is unstable, and the power supply voltage Vcc is lower than 4.8V, for example, 4V, the single chip microcomputer can not work normally at this moment and needs to be reset. R1Is 2K ohm, R2At 10K ohm, the divided voltage
Namely, the voltage of the base B of the transistor Q1 is 3.33V, the voltage of the emitter E is 4V, the emitter drop of the transistor Q1 is 4-3.33 ═ 0.67V, that is, the emitter drop is less than 0.8V, at this time, the transistor Q1 is in the off state, the resistance between the emitter E and the collector C is extremely large, it is considered that the two are disconnected, the collector C is grounded to GND through the first resistor R3, and the voltage of the collector C is used as the Reset signal Reset.
The above is merely an exemplary description, and the present embodiment is not limited thereto. The working voltage of the single chip microcomputer is generally in a range of 4.8V-5V for example. The supply voltage may be other than 5V because the operating voltage varies from one single chip or controller to another, depending on the type of controller to which the reset circuit is to be reset.
The reset circuit of this embodiment, through setting up isolating circuit, the singlechip connect the power VCC through triode Q1, triode Q1 can prevent the electrostatic breakdown, improves reset circuit's reliability, for the singlechip provides the protection, improves the antistatic effect of singlechip.
In the reset circuit of the present embodiment, as shown in fig. 2, the output circuit includes: a second resistor R4 and a capacitor C1. One end of the second resistor R4 is connected to the collector C of the transistor Q1. One end of the capacitor C1 is connected to the ground GND, and the other end is connected to the other end of the second resistor R4. The other end of the second resistor R4 and the other end of the capacitor C1 are connected together and used as the output end of the output circuit, and the output end of the output circuit is connected with a reset pin of the single chip microcomputer.
When the power supply voltage is in the working voltage range of the single chip microcomputer, the triode Q1 is in a saturated state, and the voltage of the collector C of the triode Q1 is equal to the power supply voltage. The power voltage is output to the reset pin of the singlechip through a second resistor R4. When the voltage at the collector C of the transistor Q1 is equal to the supply voltage, the capacitor C1 of the output circuit is also charged, and the voltage across the capacitor C1 is also equal to the supply voltage.
When the power supply voltage is lower than the working voltage range of the single chip microcomputer, the triode Q1 is in a cut-off state, the collector C of the triode Q1 is grounded GND through the first resistor R3, and the first resistor R3, the second resistor R4 and the capacitor C1 form a loop. Due to the presence of the capacitor C1 in the loop, the voltage at the output of the output circuit does not immediately drop to zero. The capacitor C1 in the loop discharges through the first resistor R3 and the second resistor R4, and the voltage at the connection end of the second resistor R4 and the capacitor C1 is zero after the discharge is completed.
Wherein, the fall time of the output end voltage of the output circuit is determined by the parameters of the output circuit, namely, the resistance value of the first resistor R3, the resistance value of the second resistor R4 and the capacitance value of the capacitor C1, wherein:
t＝(R3+R4)*C1(2)
wherein t is the fall time, R3Is the resistance value of the first resistor, R4Is the resistance value of the second resistor, C1Is the capacitance value of the capacitor.
For the example shown in FIG. 2, the first resistor R3 has a resistance value of 10K ohms and the second resistor R3 has a resistance value of 10K ohmsThe resistance of the resistor R4 is 2K ohm, and the capacitance of the capacitor C1 is 10-7In the method, the falling time t is (10+2) × 103*10-71.2 ms. Namely, when the power supply voltage is lower than the working voltage range of the single chip microcomputer, the Reset signal Reset is zero after 1.2ms, and the single chip microcomputer is Reset.
The capacitor C1 in the output circuit of the reset circuit of the present embodiment can also play a role in interference resistance. Because the capacitor C1 has the characteristic of direct connection and intersection, the capacitor C1 is connected between the reset pin of the single chip microcomputer and the ground GND, and the function of a filter is achieved. When the reset circuit is interfered by the outside and generates a high-frequency signal, the high-frequency signal can be filtered by the capacitor C1 and can not be output to the singlechip, so that the anti-interference capability of the reset circuit is improved, and the condition of false triggering is avoided.
In addition, the reset circuit of the present embodiment may further include: and an anti-interference circuit. The anti-interference circuit is connected with a power supply VCC. The high frequency signal of the power supply VCC is filtered. The anti-jamming circuit includes: and one end of the filter capacitor is connected with a power supply VCC, and the other end of the filter capacitor is grounded GND. When the power VCC has high-frequency signals, the filter capacitor filters the high-frequency signals, so that the high-frequency signals cannot enter the reset circuit, the anti-interference capability of the reset circuit is further improved, and the condition of false triggering is avoided.
Another embodiment of the present invention further provides a control circuit, which includes a controller and the reset circuit of the above embodiment; the reset circuit is connected with a reset pin of the controller. The controller may be a single chip microcomputer.
The utility model discloses another embodiment provides an air conditioner, include: the control circuit of the above embodiment.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (15)
1. A reset circuit for resetting a controller, comprising:
a voltage dividing circuit connected to a power supply (VCC);
an isolation circuit connecting the voltage dividing circuit and the power supply (VCC);
and the input end of the output circuit is connected with the isolation circuit, and the output end of the output circuit is connected with the reset pin of the controller.
2. The Reset circuit of claim 1, wherein the isolation circuit receives a power supply voltage and a divided voltage output by the voltage dividing circuit, and outputs the power supply voltage or a Reset signal (Reset) according to a relationship between the power supply voltage and the divided voltage.
3. The reset circuit of claim 2, wherein the isolation circuit comprises: a PNP transistor (Q1).
4. The reset circuit of claim 3 wherein the emitter (E) of the PNP transistor (Q1) is coupled to the power supply (VCC), the base (B) is coupled to the output of the voltage divider circuit, and the collector (C) is coupled to the input of the output circuit.
5. The reset circuit of claim 4, wherein the supply voltage and the divided voltage cause the PNP transistor (Q1) to be in saturation when the supply voltage is within the operating voltage range of the controller, the voltage at the collector (C) is a supply voltage, and the supply voltage is output through the output circuit.
6. The Reset circuit of claim 4, wherein when the power supply voltage is lower than the operating voltage range of the controller, the power supply voltage and the divided voltage cause the PNP transistor (Q1) to be in an OFF state, the voltage at the collector (C) being used as a Reset signal (Reset), the Reset signal (Reset) being output via the output circuit.
7. The reset circuit of any one of claims 1 to 6, wherein a voltage division ratio of the voltage division circuit is adjustable.
8. The reset circuit of claim 7, wherein the voltage divider circuit comprises: the first voltage division resistor and the second voltage division resistor adjust the voltage division ratio of the voltage division circuit by adjusting the resistance values of the first voltage division resistor and the second voltage division resistor.
9. The Reset circuit of claim 4 wherein the Reset signal (Reset) falls to zero over a predetermined time.
10. The reset circuit of claim 9 wherein the collector (C) is connected to Ground (GND) via a first resistor (R3); the output circuit includes: a second resistor (R4) and a capacitor (C1);
the second resistor (R4) is connected with the collector (C) at one end;
one end of the capacitor (C1) is Grounded (GND), and the other end of the capacitor (C1) is connected with the other end of the second resistor (R4) and is used as the output end of the output circuit;
the predetermined time is equal to a product of a sum of a resistance value of the first resistor (R3) and a resistance value of the second resistor (R4) and a capacitance value of the capacitor (C1).
11. The reset circuit of claim 1, further comprising: and the anti-interference circuit is connected with the power supply (VCC).
12. The reset circuit of claim 11, wherein the immunity circuit comprises: and one end of the filter capacitor is connected with the power supply (VCC), and the other end of the filter capacitor is Grounded (GND).
13. A control circuit comprising a controller and the reset circuit of any one of claims 1 to 12; the reset circuit is connected with a reset pin of the controller.
14. The control circuit of claim 13, wherein the controller is a single-chip microcomputer.
15. An air conditioner, comprising: the control circuit of claim 13 or 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921291699.6U CN210624841U (en) | 2019-08-09 | 2019-08-09 | Reset circuit, control circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921291699.6U CN210624841U (en) | 2019-08-09 | 2019-08-09 | Reset circuit, control circuit and air conditioner |
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| CN210624841U true CN210624841U (en) | 2020-05-26 |
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| CN201921291699.6U Active CN210624841U (en) | 2019-08-09 | 2019-08-09 | Reset circuit, control circuit and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332683A (en) * | 2019-08-09 | 2019-10-15 | 宁波奥克斯电气股份有限公司 | A kind of reset circuit, control circuit and air conditioner |
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2019
- 2019-08-09 CN CN201921291699.6U patent/CN210624841U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332683A (en) * | 2019-08-09 | 2019-10-15 | 宁波奥克斯电气股份有限公司 | A kind of reset circuit, control circuit and air conditioner |
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