Temperature controller power-down memory circuit and temperature controller

Abstract

The utility model relates to the technical field of temperature controllers, and discloses a temperature controller power-down memory circuit and a temperature controller, and the temperature controller power-down memory circuit is characterized in that a control unit comprises a voltage input port and an input / output port; the power supply circuit is connected with the voltage input port; the power failure detection circuit comprises a first diode, a controllable switch and a first resistor; the cathode of the first diode is connected with the power supply circuit. The anode of the first diode is connected with the first end of the controllable switch and one end of the first resistor. The second end of the controllable switch is respectively connected with the input / output port and the power supply circuit; the third end of the controllable switch is connected with the other end of the first resistor and is grounded. The voltage generated by the parasitic capacitor in the power failure detection circuit is consumed through the first resistor, so that the on-off of the controllable switch can accurately reflect whether power failure exists, the accuracy and reliability of a level signal detected by an input / output port are improved, the timeliness of power failure protection action execution is improved, and the power failure protection effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to temperature controller technical field especially is related to temperature controller power -off memory circuit and temperature controller. BACKGROUND

[0002] In order to avoid the parameter zero of temperature controller when power failure, usually will set a power -off protection circuit, to detect the power failure and prompt temperature controller to backup relevant parameters. However, the anti -interference ability of current power -off protection circuit is weak, leading to the accuracy and reliability of power failure detection are low, influence power -off protection action execution timeliness. UTILITY MODEL CONTENTS

[0003] The first technical problem solved by the utility model is to provide a temperature controller power -off memory circuit, which effectively solves the low accuracy and reliability of power failure detection of power -off protection circuit, and the problem of not timely power -off protection action execution.

[0004] The second technical problem solved by the utility model is to provide a temperature controller, which effectively solves the low accuracy and reliability of power failure detection of power -off protection circuit, and the problem of not timely power -off protection action execution.

[0005] The first technical problem is solved by the following technical scheme:

[0006] A temperature controller power -off memory circuit, comprising:

[0007] The control unit of temperature controller includes voltage input port and input output port;The control unit is used for switching the working state based on the level signal detected by input output port;

[0008] The power supply circuit is connected with voltage input port;

[0009] Power failure detection circuit, including first diode D1, controllable switch Q1, first resistance R1 and capacitor C1;

[0010] The negative pole of first diode D1 is connected with power supply circuit, and the positive pole of first diode D1 is connected with the first end of controllable switch Q1 and one end of first resistance R1 respectively;

[0011] The second end of controllable switch Q1 is connected with input output port, one end of capacitor C1 and power supply circuit respectively, and input output port is used for detecting the level signal of the second end of controllable switch Q1;The third end of controllable switch Q1 is connected with the other end of first resistance R1, the other end of capacitor C1 and ground.

[0012] The utility model discloses a temperature controller power -down memory circuit with background art has the beneficial effect for: the negative pole of first diode D1 is connected with the power supply circuit, and the positive pole of first diode D1 is connected with the first end of controllable switch Q1, and controllable switch Q1 can open in the condition that the power supply voltage provided by power supply circuit is greater than the voltage that first diode D1 can conduct, and the input and output port of control unit detects the level signal that shows normal power supply voltage from the second end of controllable switch Q1, and controllable switch Q1 closes in the condition that the power supply voltage provided by power supply circuit is less than the voltage that first diode D1 can conduct, and the input and output port of control unit detects the level signal that shows power -down from the second end of controllable switch Q1, thereby realizes power -down detection, and simultaneously, the first resistance R1 is connected between the positive pole of first diode D1 and the third end of controllable switch Q1, and the third end of controllable switch Q1 is grounded, and the voltage produced in the parasitic capacitance of power -down detection circuit is consumed through first resistance R1, improves the detection speed of controllable switch Q1, makes the opening and closing of controllable switch Q1 can accurately and quickly reflect whether there is power -down, and the reliability is higher, thereby improves the timeliness of power -down protection action execution.

[0013] In one of the embodiments, the power -down detection circuit further comprises a capacitor C1, the second end of the controllable switch Q1 is connected with one end of the capacitor C1, and the third end of the controllable switch Q1 is connected with the other end of the capacitor C1.

[0014] In one of the embodiments, the power -down detection circuit further comprises a second resistance R2.

[0015] One end of the second resistance R2 is connected with the negative pole of the first diode D1, and the other end of the second resistance R2 is connected with the power supply circuit.

[0016] In one of the embodiments, the power -down detection circuit further comprises a third resistance R3.

[0017] One end of the third resistance R3 is connected with the second end of the controllable switch Q1, the input and output port and one end of the capacitor C1 respectively, and the other end of the third resistance R3 is connected with the power supply circuit.

[0018] In one of the embodiments, the first diode D1 is a voltage stabilizing diode.

[0019] In one of the embodiments, the voltage stabilizing voltage value of the first diode D1 is less than the power supply voltage value of the control unit.

[0020] In one of the embodiments, the power supply circuit comprises an external power supply and a rechargeable battery C2.

[0021] The external power supply is connected with the positive pole of the rechargeable battery C2 and the voltage input port respectively.

[0022] The positive pole of the rechargeable battery C2 is also connected with the second end of the controllable switch Q1.

[0023] In one of the embodiments, the power supply circuit further comprises a second diode D2.

[0024] The positive pole of the second diode D2 is connected with the external power supply, and the negative pole of the second diode D2 is connected with the positive pole of the rechargeable battery C2 and the voltage input port respectively.

[0025] In one of the embodiments, the control unit further comprises a grounding port.

[0026] The negative pole of the external power supply and the negative pole of the rechargeable battery C2 are both connected with the grounding port and grounded.

[0027] In one of the embodiments, the controllable switch Q1 is a triode, the first end of the controllable switch Q1 is the base of the triode, the second end of the controllable switch Q1 is the collector of the triode, and the third end of the controllable switch Q1 is the emitter of the triode.

[0028] The second technical problem is solved by the following technical scheme:

[0029] A temperature controller comprises the temperature controller power failure memory circuit as described above. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 is a structural schematic diagram of a temperature controller power failure memory circuit according to an embodiment of the present application;

[0032] Figure 2 is a circuit schematic diagram of a temperature controller power failure memory circuit according to an embodiment of the present application.

[0033] EXPLANATION OF REFERENCE NUMERALS

[0034] 1, control unit; 2, power supply circuit; 3, power failure detection circuit. DETAILED DESCRIPTION

[0035] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0036] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0037] As described in the above background, the current power failure protection circuit has weak anti-interference ability, resulting in low accuracy and reliability of power failure detection, and the power failure protection action is not executed in time, and the protection effect is poor.

[0038] Based on this, the utility model provides a kind of temperature controller power failure memory circuit, the negative pole of first diode D1 is connected with power supply circuit, the positive pole of first diode is connected with the first end of controllable switch Q1, controllable switch Q1 can be opened in the case that the supply voltage provided by power supply circuit is greater than the voltage that first diode D1 can be turned on, the level signal representing normal supply voltage is detected from the second end of controllable switch Q1 in the input and output port of control unit, controllable switch Q1 is closed in the case that the supply voltage provided by power supply circuit is less than the voltage that first diode D1 can be turned on, the level signal representing power failure is detected from the second end of controllable switch Q1 in the input and output port of control unit, to realize power failure detection;Meanwhile, first resistor R1 is connected between the positive pole of first diode D1 and the third end of controllable switch Q1, and the third end of controllable switch Q1 is grounded, the voltage generated by parasitic capacitance in power failure detection circuit is consumed by first resistor R1, the detection speed and accuracy of the voltage of the first end of input controllable switch Q1 are improved, the opening and closing of controllable switch Q1 can accurately reflect whether there is power failure, so that the timeliness of power failure protection action is executed;Capacitor C1 is connected between the input and output port of control unit and the third end of controllable switch Q1, and the third end of controllable switch Q1 is grounded, filtering is carried out through capacitor C1, the anti-interference ability of input and output port is improved, so that the accuracy and reliability of level signal detected by input and output port are improved, whether there is power failure can be accurately judged, so that the timeliness of power failure protection action is improved, and the power failure protection effect is improved.

[0039] The embodiments of the utility model will be described below in combination with Figures 1 to 2 The embodiments of the utility model will be described below in combination with

[0040] According to the embodiment of the present application, on the one hand, a power-off memory circuit of a temperature controller is provided. Figure 1 is a structural schematic diagram of the power-off memory circuit of the temperature controller according to the embodiment of the present application, as Figure 1 indicated, the power-off memory circuit of the temperature controller comprises a control unit 1 of the temperature controller, a power supply circuit 2, and a power-off detection circuit 3, and the control unit 1, the power supply circuit 2, and the power-off detection circuit 3 are connected two by two.

[0041] In the embodiment, as Figure 1 indicated, the control unit 1 of the temperature controller, that is, the microcontroller (Micro Controller Unit, MCU) of the temperature controller, comprises a voltage input port (VDD port) and an input / output port (I / O port). The control unit 1 is used to switch the working state based on the level signal detected by the input / output port. If the level signal detected by the input / output port is a level signal representing that the power supply voltage is normal, the control unit 1 switches the working state to a normal working state, at which time the temperature controller normally works; if the level signal detected by the input / output port is a level signal representing that the power supply voltage is powered off, the control unit 1 switches the working state to a low-power-consumption state and saves the working data, so as to realize power-off protection.

[0042] In the embodiment, as Figure 1 indicated, the power supply circuit 2 is connected with the voltage input port on the one hand and supplies power to the control unit 1 through the voltage input port, and is connected with the power-off detection circuit 3 on the other hand and detects the power-off of the power supply voltage of the power supply circuit 2 through the power-off detection circuit 3.

[0043] In the embodiment, as Figure 1 indicated, the power-off detection circuit 3 comprises a first diode D1, a controllable switch Q1, a first resistor R1, and a capacitor C1. The second end of the controllable switch Q1 is connected with the input / output port and the power supply circuit 2. Among them, the input / output port detects the level signal of the second end of the controllable switch Q1.

[0044] In the embodiment, as Figure 1As shown, the negative pole of the first diode D1 is connected with the power supply circuit 2, and the positive pole of the first diode D1 is connected with the first end of the controllable switch Q1. Since the power supply voltage of the power supply circuit 2 is a continuous descending process after the power supply circuit 2 is powered off, if the first diode D1 is not used and the power supply voltage is directly detected through the controllable switch Q1, the controllable switch Q1 will enter into the off state only when the power supply voltage is descended to be less than the gate voltage of the controllable switch Q1, thus causing a long delay of the power-off detection, therefore, the first diode D1 is connected in series between the power supply circuit 2 and the controllable switch Q1. When the power supply voltage of the power supply circuit 2 is less than the voltage capable of conducting of the first diode D1, the first diode D1 enters into the off state, and the controllable switch Q1 enters into the off state, and the level of the second end of the controllable switch Q1 is high, thus the input and output port detects the high level and determines that the current power supply voltage is powered off; when the power supply voltage of the power supply circuit 2 is greater than the voltage capable of conducting of the first diode D1, the first diode D1 is conducted, the controllable switch Q1 is conducted, and the level of the second end of the controllable switch Q1 is low, thus the input and output port detects the low level and determines that the current power supply voltage is normal.

[0045] In the embodiment, as shown in the figure, Figure 1 the positive pole of the first diode D1 is also connected with one end of the first resistor R1, and the third end of the controllable switch Q1 is connected with the other end of the first resistor R1 and grounded. The voltage generated by the parasitic capacitance in the power-off detection circuit 3 is consumed through the first resistor R1, the detection speed and accuracy of the voltage input to the first end of the controllable switch Q1 are improved, the opening and closing of the controllable switch Q1 can accurately and quickly reflect whether there is power-off, the reliability is high, the timeliness of the execution of the power-off protection action is improved, and thus the power-off protection effect is improved.

[0046] In the embodiment, as shown in the figure, Figure 1 the second end of the controllable switch Q1 is connected with one end of the capacitor C1, and the third end of the controllable switch Q1 is connected with the other end of the capacitor C1 and grounded. The capacitor C1 is used for filtering, the anti-interference ability of the input and output port is improved, the accuracy and reliability of the level signal detected by the input and output port are improved, whether there is power-off can be accurately judged, and thus the power-off protection effect is improved.

[0047] In one embodiment, the first diode D1 can be a stabilized diode. The voltage value of the first diode D1 is less than the power supply voltage value of the control unit 1, so that when the power supply voltage output by the power supply circuit 2 is less than the power supply voltage value of the control unit 1, the first diode D1 is cut off, the controllable switch Q1 is cut off, and the second end of the controllable switch Q1 is high.

[0048] In one embodiment, Figure 1 is a circuit schematic diagram of the power-off memory circuit of the temperature controller according to the embodiment of the utility model, as shown in the figure, Figure 2As shown, the power failure detection circuit 3 further comprises a second resistor R2. One end of the second resistor R2 is connected with the negative electrode of the first diode D1, and the other end of the second resistor R2 is connected with the power supply circuit 2. The second resistor R2 serves as a current limiting resistor to protect the first diode D1 from being broken down.

[0049] In one embodiment, as shown in FIG. 1, the power supply circuit 2 further comprises a second diode D2. The positive electrode of the second diode D2 is connected with the external power supply, and the negative electrode of the second diode D2 is connected with the positive electrode of the rechargeable battery C2 and the voltage input port respectively. Figure 2 As shown, the power failure detection circuit further comprises a third resistor R3. One end of the third resistor R3 is connected with the second end of the controllable switch Q1, the input and output port and one end of the capacitor C1 respectively, and the other end of the third resistor R3 is connected with the power supply circuit 2. The third resistor R3 serves as a protection resistor to protect the controllable switch Q1 and the control unit 1.

[0050] In one embodiment, as shown in FIG. 1, the power supply circuit 2 further comprises a second diode D2. The positive electrode of the second diode D2 is connected with the external power supply, and the negative electrode of the second diode D2 is connected with the positive electrode of the rechargeable battery C2 and the voltage input port respectively. Figure 2 As shown in FIG. 1, the power supply circuit 2 comprises an external power supply and a rechargeable battery C2. The external power supply is connected with the positive electrode of the rechargeable battery C2 and the voltage input port respectively. The positive electrode of the rechargeable battery C2 is also connected with the second end of the controllable switch Q1. When the external power supply normally supplies power, the external power supply provides power supply voltage for the control unit 1 on one hand, and charges the rechargeable battery C2 on the other hand.

[0051] In one embodiment, the power supply circuit further comprises a second diode D2. The positive electrode of the second diode D2 is connected with the external power supply, and the negative electrode of the second diode D2 is connected with the positive electrode of the rechargeable battery C2 and the voltage input port respectively. The one-way conduction of the second diode D2 can make the current flow between the external power supply and the rechargeable battery C2 be one-way, that is, the external power supply can charge the rechargeable battery C2, but the current when the rechargeable battery C2 discharges cannot flow to the external power supply, thereby ensuring that the rechargeable battery C2 only supplies power to the control unit 1 and cannot flow to the external circuit.

[0052] In one embodiment, as shown in FIG. 1, the power supply circuit 2 further comprises a second diode D2. The positive electrode of the second diode D2 is connected with the external power supply, and the negative electrode of the second diode D2 is connected with the positive electrode of the rechargeable battery C2 and the voltage input port respectively. Figure 2 Figure 2 As shown in FIG. 1, the control unit 1 further comprises a ground port (GND port), and the negative electrode of the external power supply is connected with the ground port through the second diode D2 and the rechargeable battery C2 and grounded.

[0053] In one embodiment, the controllable switch Q1 can be a triode. The first end of the controllable switch Q1 is the base of the triode, the second end of the controllable switch Q1 is the collector of the triode, and the third end of the controllable switch Q1 is the emitter of the triode.

[0054] According to the embodiments of the utility model, on the other hand, a temperature controller is also provided, which comprises the temperature controller power failure memory circuit as any one of the above.

[0055] In the specific contents of the foregoing specific embodiments, each technical feature can be combined arbitrarily without contradiction, and to make the description brief, all possible combinations of the foregoing technical features are not described, however, as long as the combinations of the technical features do not exist contradiction, it should be considered that it is within the scope of the description.

[0056] The specific contents of the foregoing specific embodiments only express several embodiments of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled person in the art, on the premise of not departing from the utility model concept, a number of modifications and improvements can be made, which belong to the protection scope of the utility model.

Claims

1. A thermostat power fail memory circuit, comprising: The temperature controller comprises: a control unit (1) of the temperature controller, comprising a voltage input port and an input-output port; the control unit (1) is configured to switch the working state based on the level signal detected by the input-output port; a power supply circuit (2) connected to the voltage input port; a power failure detection circuit (3) comprising a first diode D1, a controllable switch Q1 and a first resistor R1; the negative electrode of the first diode D1 is connected to the power supply circuit (2), and the positive electrode of the first diode D1 is connected to the first end of the controllable switch Q1 and one end of the first resistor R1, respectively; the second end of the controllable switch Q1 is connected to the input-output port and the power supply circuit (2), respectively, and the input-output port is configured to detect the level signal at the second end of the controllable switch Q1; the third end of the controllable switch Q1 is connected to the other end of the first resistor R1 and grounded.

2. The thermostat power fail memory circuit of claim 1, wherein, The power failure detection circuit (3) further comprises a capacitor C1, the second end of the controllable switch Q1 is connected to one end of the capacitor C1, and the third end of the controllable switch Q1 is connected to the other end of the capacitor C1.

3. The thermostat power fail memory circuit of claim 1, wherein, The power failure detection circuit (3) further comprises a second resistor R2; one end of the second resistor R2 is connected to the negative electrode of the first diode D1, and the other end of the second resistor R2 is connected to the power supply circuit (2).

4. The thermostat power fail memory circuit of claim 1, wherein, The power failure detection circuit (3) further comprises a third resistor R3; one end of the third resistor R3 is connected to the second end of the controllable switch Q1, the input-output port and one end of the capacitor C1, respectively, and the other end of the third resistor R3 is connected to the power supply circuit (2).

5. The thermostat power fail memory circuit of claim 1, wherein, The first diode D1 is a voltage stabilizing diode, and the voltage stabilizing value of the first diode D1 is less than the power supply voltage value of the control unit (1).

6. The thermostat power fail memory circuit of claim 1, wherein, The power supply circuit (2) comprises an external power supply and a rechargeable battery C2; the external power supply is connected to the positive electrode of the rechargeable battery C2 and the voltage input port, respectively; the positive electrode of the rechargeable battery C2 is also connected to the second end of the controllable switch Q1.

7. The thermostat power fail memory circuit of claim 6 wherein, The power supply circuit (2) further comprises a second diode D2; the positive electrode of the second diode D2 is connected to the external power supply, and the negative electrode of the second diode D2 is connected to the positive electrode of the rechargeable battery C2 and the voltage input port, respectively.

8. The thermostat power fail memory circuit of claim 6, wherein, The control unit (1) further comprises a grounding port; the negative electrode of the external power supply and the negative electrode of the rechargeable battery C2 are both connected to the grounding port and grounded.

9. The thermostat power fail memory circuit of any of claims 1-8, wherein, The controllable switch Q1 is a triode, the first end of the controllable switch Q1 is the base of the triode, the second end of the controllable switch Q1 is the collector of the triode, and the third end of the controllable switch Q1 is the emitter of the triode.

10. A thermostat, characterized by The temperature controller comprises: a power failure memory circuit of the temperature controller as claimed in any one of claims 1-9.

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