CN214851864U - PTC electrical heating self-checking circuit and air conditioner - Google Patents
PTC electrical heating self-checking circuit and air conditioner Download PDFInfo
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- CN214851864U CN214851864U CN202120581936.3U CN202120581936U CN214851864U CN 214851864 U CN214851864 U CN 214851864U CN 202120581936 U CN202120581936 U CN 202120581936U CN 214851864 U CN214851864 U CN 214851864U
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Abstract
The utility model provides a PTC electric heating self-checking circuit and an air conditioner, wherein the circuit comprises an electric heating control module and an electric heating monitoring module; the electric heating control module comprises an electric heating coil, a control switch and a first fuse, and the electric heating monitoring module comprises an optical coupler and an electric heating monitoring element; the electric heating coil is connected with a first end of the control switch, and a second end of the control switch is connected with the power supply end through the first fuse; the positive electrode of the input end of the optical coupler is connected with the power supply end, and the negative electrode of the input end of the optical coupler is connected with the first end of the control switch; the positive electrode and the negative electrode of the output end of the optical coupler are respectively connected with a working voltage end and a grounding end; the electric heating monitoring element is connected with the anode of the output end and used for monitoring the on-off state of the optical coupler. The utility model discloses can detect the operating condition of PTC coil circular telegram operating condition, fuse, realize PTC electric heating circuit work self-checking.
Description
Technical Field
The utility model relates to an air conditioner technical field particularly, relates to a PTC electrical heating self-checking circuit and air conditioner.
Background
The electric heater of the current air conditioner usually adopts a PTC (Positive Temperature Coefficient) electric heater or an electric heating tube heater. The PTC electric heater can change the heat productivity according to the change of the room temperature and the air volume of the indoor unit, thereby properly adjusting the indoor temperature, achieving the purpose of rapid and powerful heating and enabling the air conditioner to be normally used in severe cold areas.
The control circuit of the existing PTC electric heater can only realize double disconnection/double connection of a zero line and a live line, so that the integral use safety of the PTC electric heater is ensured, but whether the PTC coil works normally or not and overheat/overcurrent protection cannot be detected.
SUMMERY OF THE UTILITY MODEL
The utility model provides a problem be current PTC electric heater's control circuit, can't detect whether normal work of PTC coil, overheated/overcurrent protection's problem.
In order to solve the above problems, the present invention provides a PTC electrical heating self-checking circuit, which comprises an electrical heating control module and an electrical heating monitoring module; the electric heating control module comprises an electric heating coil, a control switch and a first fuse, and the electric heating monitoring module comprises an optical coupler and an electric heating monitoring element; the electric heating coil is connected with a first end of the control switch, and a second end of the control switch is connected with a power supply end through the first fuse; the positive electrode of the input end of the optical coupler is connected with the power supply end, and the negative electrode of the input end of the optical coupler is connected with the first end of the control switch; the positive electrode and the negative electrode of the output end of the optical coupler are respectively connected with a working voltage end and a grounding end; the electric heating monitoring element is connected with the positive electrode of the output end and used for monitoring the on-off state of the optical coupler.
The utility model provides a PTC electrical heating self-checking circuit can detect the operating condition of PTC coil circular telegram operating condition, fuse to judge whether normal work of PTC electrical heating circuit realizes PTC electrical heating circuit work self-checking, uses less components and parts, and simple structure and reliability are high, are applicable to integrated in the circuit board.
Optionally, the electrical heating monitoring module further comprises a thermal protector; the thermal protector is arranged between the positive electrode of the input end and the power supply end, or between the negative electrode of the input end and the first end of the control switch.
The utility model provides a PTC electrical heating self-checking circuit, electrical heating monitoring module still include the thermal protector, can carry out temperature monitoring to electrical heating coil, and the disconnection leads to the optical coupler disconnection when electrical heating coil is overheated to monitor work abnormal signal, realize thermal protector and electrical heating coil's self-checking.
Optionally, the electrical heating monitoring module further comprises a second fuse; the second fuse set up in the input positive pole with between the supply end, perhaps, set up in the input negative pole with between control switch's the first end.
The utility model provides a PTC electrical heating self-checking circuit, electrical heating monitoring module still include the second fuse, can play the guard action to the optical coupler.
Optionally, the electric heating monitoring module further comprises a first resistor and/or a first diode connected in parallel with the input end of the optical coupler; the anode of the first diode is connected with the cathode of the input end of the optical coupler, and the cathode of the first diode is connected with the anode of the input end of the optical coupler.
The utility model provides a PTC electrical heating self-checking circuit, electrical heating monitoring module still include first resistance and/or first diode, play reposition of redundant personnel and one-way conduction restriction, play the guard action to the optical coupler.
Optionally, the electrical heating monitoring module further comprises a second resistor and/or a second diode connected in series with the input end of the optocoupler; and the anode of the second diode is connected with the cathode of the input end of the optical coupler, and the cathode of the second diode is connected with the thermal protector.
The utility model provides a PTC electrical heating self-checking circuit, electrical heating monitoring module still include second resistance and/or second diode, play voltage limiting and one-way conduction restriction, play the guard action to the optical coupler.
Optionally, the electrical heating monitoring module further comprises a third resistor connected in series with the output terminal of the optical coupler.
The utility model provides a PTC electrical heating self-checking circuit, electrical heating monitoring module still include the third resistance, play the voltage limiting guard action.
Optionally, the control switch comprises a first relay and a second relay; the first relay is connected between a phase line end of the power supply end and the electric heating coil, the second relay is connected between the first fuse and the electric heating coil, and the second relay is connected with a zero line end of the power supply end through the first fuse; and the positive electrode of the input end of the optical coupler is connected with the phase line end, and the negative electrode of the input end of the optical coupler is connected between the second relay and the zero line end.
The utility model provides a PTC electrical heating self-checking circuit, control switch can adopt the form of two independent relays, and the break-make state of being connected between control supply end and the electric heating coil realizes the effective control whether to the circular telegram of electric heating coil.
Optionally, the control switch comprises a two-way ac contactor, or two one-way ac contactors; the double-circuit alternating current contactor and the two single-circuit alternating current contactors are used for controlling the connection and disconnection of the lines between the electric heating coil and the phase line end and the zero line end of the power supply end.
The utility model provides a PTC electrical heating self-checking circuit, control switch can adopt multiple form, for example double-circuit ac contactor, perhaps two single-circuit ac contactor to the realization is to the effective control whether electric heating coil circular telegram.
Optionally, the control switch is connected with an electric heating controller; the electric heating controller comprises a triode or a field effect transistor.
The utility model provides a concrete components and parts of electric heating controller can realize the on-off control to control switch.
The utility model provides an air conditioner, including above-mentioned PTC electrical heating self-checking circuit.
The utility model provides an air conditioner can reach the same technological effect with above-mentioned PTC electrical heating self-checking circuit.
Drawings
Fig. 1 is a schematic structural diagram of a PTC electrical heating self-checking circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a control switch according to an embodiment of the present invention.
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.
Fig. 1 is a schematic structural diagram of the PTC electrical heating self-checking circuit of the present invention, showing an electrical heating control module 100 and an electrical heating monitoring module 200.
The electric heating control module 100 comprises an electric heating coil E1H, control switches K1M, K5M and a first fuse F2U, and the electric heating monitoring module comprises an optical coupler OC and an electric heating monitoring element a;
the electric heating coil E1H is connected with the first ends of the control switches K1M and K5M, and the second ends of the control switches K1M and K5M are connected with the power supply ends (including phase lines AC-L and neutral lines AC-N) through a first fuse F2U.
The positive electrode of the input end of the optical coupler OC is connected with the power supply end, and the negative electrode of the input end of the optical coupler OC is connected with the first end of the control switch; the positive electrode and the negative electrode of the output end of the optical coupler OC are respectively connected with a working voltage end (+5V) and a grounding end.
The electric heating monitoring element A is connected with the anode of the output end of the optical coupler OC and is used for monitoring the on-off state of the optical coupler OC.
In fig. 1, the control switch including the first relay K1M and the second relay K2M is described as an example. The first relay K1M is connected between a phase line end AC-L of the power supply end and an electric heating coil E1H, the second relay K2M is connected between a first fuse F2U and the electric heating coil E1H, and the second relay K2M is connected with a zero line end AC-N of the power supply end through the first fuse F2U.
The positive pole of the input end of the optical coupler OC is connected with the phase line end AC-L, and the negative pole of the input end of the optical coupler OC is connected between the second relay K2M and the zero line end AC-N.
If the PTC electric heater needs heating, K1M and K5M are attracted, and the optical coupler OC is connected with AC-L, AC-N through E1H, F2U, K5M and K1M. At this time, if all of E1H, F2U, K5M and K1M are normally operated, the light emitting device (e.g., light emitting diode) of the optocoupler OC emits light, the photosensor (e.g., photodiode, phototransistor, photoresistor, etc.) is turned on, the operating voltage +5V is grounded through the photosensor, and the electric heating monitor element detects a low level signal.
Specifically, for a 50Hz power supply, the electrical heating monitoring element will get a low level signal of about 10ms every 20ms, and for a 60Hz power supply, the electrical heating monitoring element will get a low level signal of about 8.33ms every 16.67 ms. On the contrary, if any one of the devices E1H, F2U, K5M, K1M fails (open circuit), the light emitting device of the photo coupler OC does not emit light, the photo sensor is turned off, and the operating voltage +5V is connected to the electric heating monitor element, which detects a continuous high level signal.
The PTC electrical heating self-checking circuit that this embodiment provided can detect the operating condition of PTC coil circular telegram operating condition, fuse through the operating condition who monitors optical coupler to judge whether normal work of PTC electrical heating circuit realizes PTC electrical heating circuit work self-checking, uses less components and parts, and simple structure and reliability are high, are applicable to and integrate in the circuit board.
As shown in fig. 1, a thermal protector Q1L is also included in the electrical heating monitoring module 200. In fig. 1, the thermal protector Q1L is disposed between the negative terminal of the OC input terminal and the first terminal of the control switch K5M, or between the positive terminal of the OC input terminal and the power supply terminal.
It is also shown in FIG. 1 that the electrical heating monitoring module 200 may also include a second fuse F1T. The second fuse F1T may be disposed between the positive terminal of the OC input terminal and the power supply terminal, or between the negative terminal of the OC input terminal and the first terminal of the control switch. In fig. 1, a second fuse F1T is connected in series with a thermal protector Q1L, then connected in series with the negative terminal of the OC input terminal, and further connected to K5M between E1H.
As shown in fig. 1, the electrical heating monitoring module 200 may further include a first resistor R1 and/or a first diode D1 connected in parallel with the input terminal of the optocoupler OC; the anode of the first diode D1 is connected to the cathode of the input terminal of the optocoupler OC, and the cathode of the first diode D1 is connected to the anode of the input terminal of the optocoupler. The electrical heating monitoring module may further comprise a second resistor R2 and/or a second diode D2 in series with the input of the optocoupler OC; the anode of the second diode D2 is connected to the cathode of the input of the optocoupler, and the cathode of the second diode D2 is connected to the thermal protector.
As shown in fig. 1, the electrical heating monitoring module may further include a third resistor R3 connected in series with the output of the optocoupler OC.
Fig. 2 shows a schematic structural diagram of the control switch, and taking the example that the control switch includes two relays K1M and K5M linked together, the electric heating controller is connected to both K1M and K5M, and is controlled to be turned on or off at the same time. The electric heating controller can comprise a control element such as a triode or a field effect transistor. As shown in fig. 2, the electric heating controller further includes a protection resistor R5.
Alternatively, the control switch may also adopt a two-way ac contactor, or two one-way ac contactors, where the two-way ac contactor and the two one-way ac contactor are used to control on/off of a line between the electric heating coil E1H and the phase line end and the neutral line end of the power supply end.
The embodiment of the utility model provides a PTC electrical heating protection self-checking circuit design, this circuit is simple, and the reliability is high, is applicable to less power PTC electrical heating work self-checking, and used components and parts are few, are fit for the integration in the circuit board.
The embodiment of the utility model provides an air conditioner is still provided, including above-mentioned PTC electrical heating self-checking circuit.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
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.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
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 (10)
1. A PTC electric heating self-checking circuit is characterized by comprising an electric heating control module and an electric heating monitoring module; the electric heating control module comprises an electric heating coil, a control switch and a first fuse, and the electric heating monitoring module comprises an optical coupler and an electric heating monitoring element;
the electric heating coil is connected with a first end of the control switch, and a second end of the control switch is connected with a power supply end through the first fuse;
the positive electrode of the input end of the optical coupler is connected with the power supply end, and the negative electrode of the input end of the optical coupler is connected with the first end of the control switch;
the positive electrode and the negative electrode of the output end of the optical coupler are respectively connected with a working voltage end and a grounding end;
the electric heating monitoring element is connected with the positive electrode of the output end and used for monitoring the on-off state of the optical coupler.
2. The PTC electrical-heating self-test circuit according to claim 1, wherein the electrical-heating monitoring module further comprises a thermal protector;
the thermal protector is arranged between the positive electrode of the input end and the power supply end, or between the negative electrode of the input end and the first end of the control switch.
3. The PTC electrical-heating self-test circuit according to claim 2, wherein the electrical-heating monitoring module further comprises a second fuse;
the second fuse set up in the input positive pole with between the supply end, perhaps, set up in the input negative pole with between control switch's the first end.
4. A PTC electrically heated self-test circuit as claimed in claim 3, wherein the electrical heating monitoring module further comprises a first resistor and/or a first diode connected in parallel with the input terminal of the optocoupler;
the anode of the first diode is connected with the cathode of the input end of the optical coupler, and the cathode of the first diode is connected with the anode of the input end of the optical coupler.
5. The PTC electrical heating self-test circuit according to claim 4, wherein the electrical heating monitoring module further comprises a second resistor and/or a second diode connected in series with the input terminal of the optocoupler;
and the anode of the second diode is connected with the cathode of the input end of the optical coupler, and the cathode of the second diode is connected with the thermal protector.
6. A PTC electrical heating self-test circuit according to claim 4 or 5, wherein the electrical heating monitoring module further comprises a third resistor in series with the output of the optocoupler.
7. A PTC electrical heating self-test circuit according to any of claims 1-5, wherein the control switch comprises a first relay and a second relay;
the first relay is connected between a phase line end of the power supply end and the electric heating coil, the second relay is connected between the first fuse and the electric heating coil, and the second relay is connected with a zero line end of the power supply end through the first fuse;
and the positive electrode of the input end of the optical coupler is connected with the phase line end, and the negative electrode of the input end of the optical coupler is connected between the second relay and the zero line end.
8. A PTC electrical heating self-test circuit according to any of claims 1-5, wherein the control switch comprises a two-way AC contactor, or two one-way AC contactors;
the double-circuit alternating current contactor and the two single-circuit alternating current contactors are used for controlling the connection and disconnection of the lines between the electric heating coil and the phase line end and the zero line end of the power supply end.
9. The PTC electrical-heating self-test circuit according to claim 7, wherein the control switch is connected to an electrical-heating controller;
the electric heating controller comprises a triode or a field effect transistor.
10. An air conditioner characterized by comprising the PTC electrical heating self-test circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120581936.3U CN214851864U (en) | 2021-03-22 | 2021-03-22 | PTC electrical heating self-checking circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120581936.3U CN214851864U (en) | 2021-03-22 | 2021-03-22 | PTC electrical heating self-checking circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214851864U true CN214851864U (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120581936.3U Active CN214851864U (en) | 2021-03-22 | 2021-03-22 | PTC electrical heating self-checking circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214851864U (en) |
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2021
- 2021-03-22 CN CN202120581936.3U patent/CN214851864U/en active Active
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