CN204179018U - Relay protection circuit and electric cooker - Google Patents
Relay protection circuit and electric cooker Download PDFInfo
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- CN204179018U CN204179018U CN201420648669.7U CN201420648669U CN204179018U CN 204179018 U CN204179018 U CN 204179018U CN 201420648669 U CN201420648669 U CN 201420648669U CN 204179018 U CN204179018 U CN 204179018U
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Abstract
The utility model provides a kind of relay protection circuit and electric cooker, the first end of described relay is connected with the positive pole of power supply, second end of described relay is connected with the first end of load, second end of described load is connected with the negative pole of power supply, described protective circuit comprises: first circuit in parallel with described relay, and described first circuit comprises first electric capacity and the first resistance of connecting successively; With the second resistance of described first Capacitance parallel connection; The second circuit in parallel with described load, described second circuit comprise described first resistance and with the second electric capacity of described first resistant series or diode, thus the self induction voltage of relay can be eliminated by the first electric capacity and the first resistance, eliminated the self induction voltage of load by the second electric capacity or diode, and then solve and cause relay contact to burn distortion due to the existence of self induction voltage and damage the problem of the electric heating appliances such as electric cooker.
Description
Technical field
The utility model relates to electronic technology field, more particularly, relates to a kind of relay protection circuit and electric cooker.
Background technology
The electric heating appliances such as existing electric cooker, are all by the device drive such as control chip and transistor relay closes or disconnection, carry out control heater and whether heat.But, because relay exists electromagnetic induction phenomenon, therefore, when relay power or power-off, reverse self induction voltage can be there is in relay and heater even load.
Although existing electric cooker passes through the mode of an electric capacity in parallel on the heaters, eliminate the self induction voltage of heater.But, this electric capacity can not eliminate the self induction voltage of relay, therefore, when relay power or power-off, relay can be caused to occur the phenomenon that overtension, electric current are excessive due to the existence of self induction voltage, and then cause the contact of relay to burn distortion, even there is the problem damaging the electric heating appliances such as electric cooker.
Utility model content
In view of this; the utility model provides a kind of relay protection circuit and electric cooker; to eliminate too high voltages or super-high-current to the impact of relay, solve cause relay contact to burn due to the existence of self induction voltage problem that distortion even damages the electric heating appliances such as electric cooker.
For achieving the above object, the utility model provides following technical scheme:
A kind of relay protection circuit, the first end of described relay is connected with the positive pole of power supply, and the second end of described relay is connected with the first end of load, and the second end of described load is connected with the negative pole of power supply, and described protective circuit comprises:
First circuit in parallel with described relay, described first circuit comprises first electric capacity and the first resistance of connecting successively, the first end of described first electric capacity is connected with the first end of described relay, second end of described first electric capacity is connected with the first end of described first resistance, second end of described first resistance is connected with the second end of described relay, and the second end of described first resistance is connected with the first end of described load;
With the second resistance of described first Capacitance parallel connection, the first end of described second resistance is connected with the first end of described first electric capacity, and the second end of described second resistance is connected with the second end of described first electric capacity;
The second circuit in parallel with described load, described second circuit comprise described first resistance and with the second electric capacity of described first resistant series or diode, and the first end of described second electric capacity or diode is connected with the first end of described first resistance, the second end of described second electric capacity or diode is connected with the second end of described load.
Preferably, when described power supply is AC power, described second circuit comprises described first resistance and the second electric capacity with described first resistant series, the first end of described second electric capacity is connected with the first end of described first resistance, and the second end of described second electric capacity is connected with the second end of described load.
Preferably, described protective circuit also comprises:
Three electric capacity in parallel with described relay and load, the first end of described 3rd electric capacity is connected with the first end of described relay, and described second end of the 3rd electric capacity is connected with the second end of described load.
Preferably, described first electric capacity, the second electric capacity and the 3rd electric capacity are polarity free capacitor.
Preferably, the range of capacity of described first electric capacity is 0.2 μ F ~ 5 μ F, and the range of capacity of described second electric capacity is 0.01 μ F ~ 2 μ F, and the range of capacity of described 3rd electric capacity is 0.2 μ F ~ 20 μ F.
Preferably, when described power supply is DC power supply, described second circuit comprises described first resistance and the diode with described first resistant series, and the negative pole of described diode is connected with the first end of described first resistance, and the positive pole of described diode is connected with the second end of described load.
Preferably, described first electric capacity is electrochemical capacitor.
Preferably, the range of capacity of described first electric capacity is 0.05 μ F ~ 1000 μ F.
Preferably, the Standard resistance range of described first resistance is 10 Ω ~ 3000 Ω, and the Standard resistance range of described second resistance is 10K Ω ~ 2000K Ω.
Preferably, described load is heater.
A kind of electric cooker, comprises the relay protection circuit as above described in any one.
Compared with prior art, technical scheme provided by the utility model has the following advantages:
Relay protection circuit provided by the utility model and electric cooker; when relay power or power-off; the self induction voltage at relay two ends can due to the charging of the first electric capacity in the first circuit absorb and the first resistance consumption and decay totally; and; because load is in parallel with the first resistance and second circuit; therefore; the self induction voltage of load can be eliminated by the second electric capacity in the first resistance and second circuit or diode, thus avoid and cause relay contact to burn distortion due to the existence of self induction voltage and damage the problem of the electric heating appliances such as electric cooker.In addition, because the first electric capacity and the second resistance constitute discharge loop, therefore, the electricity in the first electric capacity after charging by the second resistance consumption totally, thus can limit the impact of the first capacitor discharge to relay.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
A kind of relay protection circuit figure that Fig. 1 provides for an embodiment of the present utility model;
A kind of relay protection circuit figure that Fig. 2 provides for another embodiment of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
An embodiment of the present utility model provides a kind of relay protection circuit; as shown in Figure 1; relay K is connected with load R; and; relay K after series connection is connected with the both positive and negative polarity of power supply M respectively with the two ends of load R; as shown in Figure 1; the protective circuit of relay K comprises first circuit 40 in parallel with relay K; and the first circuit 40 comprises the first electric capacity C1 and the first resistance R1 that connect successively; in addition, the protective circuit of relay K also comprises the second resistance R2 in parallel with the first electric capacity C1 and the second circuit 50 in parallel with load R.
Wherein, as shown in Figure 1, the first end of relay K is connected with the positive pole of power supply M the annexation of relay K, load R and power supply M, and the second end of relay K is connected with the first end of load R, and second end of load R is connected with the negative pole of power supply M.
The annexation of the first circuit 40 and relay K as shown in Figure 1, the first end of the first electric capacity C1 is connected with the first end of relay K, second end of the first electric capacity C1 is connected with the first end of the first resistance R1, second end of the first resistance R1 is connected with the second end of relay K, and second end of the first resistance R1 is connected with the first end of load R.Wherein, the first end of the second resistance R2 is connected with the first end of the first electric capacity C1, and second end of the second resistance R2 is connected with second end of the first electric capacity C1.
Also as shown in Figure 1, second circuit 50 comprises the first resistance R1 and second electric capacity of connecting with the first resistance R1 or diode to the annexation of second circuit 50 and load R.In the present embodiment, second circuit 50 preferably includes the first resistance R1 and the second electric capacity C2, and the first end of the second electric capacity C2 is connected with the first end of the first resistance R1, and second end of the second electric capacity C2 is connected with second end of load R.
In the present embodiment, power supply M is AC power, and load R is the heater of electric cooker.But because power supply M is AC power, therefore, in order to eliminate the surge current of AC power M, the protective circuit in the present embodiment also comprises the three electric capacity C3 in parallel with relay K and load R, effectively to prevent surge current to the impact of relay K.The first end of the 3rd electric capacity C3 is connected with the first end of relay K, second end of the 3rd electric capacity C3 is connected with second end of load R, namely as shown in Figure 1,3rd electric capacity C3 is between the both positive and negative polarity of power supply M, namely the first end of the 3rd electric capacity C3 is connected with the positive pole of power supply M, and second end of the 3rd electric capacity C3 is connected with the negative pole of power supply M.In addition, the first electric capacity C1 in the present embodiment, the first resistance R1, the second resistance R2 and the second electric capacity C2 also can play the effect of certain elimination surge current.
When relay K energising or power-off, the self induction voltage of relay K can due to the charging of the first electric capacity C1 absorb and the first resistance R1 consumption and decay totally, and, because the first electric capacity C1 and the second resistance R2 constitutes discharge loop, therefore, electricity in the first electric capacity C1 after charging can pass through the second resistance R2 approach exhaustion, impacts relay K to limit the electric discharge of the first electric capacity C1.
In order to the effect making the first electric capacity C1, the first resistance R1 and the second resistance R2 give full play to protection relay K, in the present embodiment, the first electric capacity C1 is polarity free capacitor, and wherein, the range of capacity of the first electric capacity C1 is 0.2 μ F ~ 5 μ F, is preferably 1 μ F; The Standard resistance range of the first resistance R1 is 10 Ω ~ 3000 Ω, is preferably 100 Ω; The Standard resistance range of the second resistance R2 is 10K Ω ~ 2000K Ω, is preferably 1000K Ω.
In addition, because load R is in parallel with the first resistance R1 and the second electric capacity C2, therefore, the self induction voltage of load R can be eliminated by the first resistance R1 and the second electric capacity C2.Preferably, the second electric capacity C2 and the 3rd electric capacity C3 is polarity free capacitor, and the range of capacity of the second electric capacity C2 is 0.01 μ F ~ 2 μ F, is preferably 0.2 μ F; The range of capacity of the 3rd electric capacity is 0.2 μ F ~ 20 μ F, is preferably 2 μ F.
The relay protection circuit that the present embodiment provides; when relay power or power-off; the self induction voltage at relay two ends can due to the charging of the first electric capacity absorb and the first resistance consumption and decay totally; and; because load is in parallel with the first resistance and second circuit; therefore; the self induction voltage of load can be eliminated by the second electric capacity in the first resistance and second circuit, thus avoid and cause relay contact to burn distortion due to the existence of self induction voltage and damage the problem of the electric heating appliances such as electric cooker.In addition, because the first electric capacity and the second resistance constitute discharge loop, therefore, the electricity in the first electric capacity after charging by the second resistance consumption totally, thus can limit the impact of the first capacitor discharge to relay.
Of the present utility modelly another embodiment provides for a kind of relay protection circuit, the protective circuit general structure that the relay protection circuit that the present embodiment provides and above-described embodiment provide is identical, as shown in Figure 2, relay K is connected with load R, and, relay K after series connection is connected with the both positive and negative polarity of power supply M1 respectively with the two ends of load R, protective circuit in the present embodiment comprises first circuit 40 in parallel with relay K, this first circuit 40 comprises the first electric capacity C1 and the first resistance R1 that connect successively, in addition, the protective circuit of relay K also comprises the second resistance R2 in parallel with the first electric capacity C1, and the second circuit 50 in parallel with load R.
The difference of the relay protection circuit that the present embodiment provides and the protective circuit that above-described embodiment provides is; power supply M1 in the present embodiment is DC power supply; and second circuit 50 is diode S; as shown in Figure 2; the diode S that second circuit 50 comprises the first resistance R1 and connects with the first resistance R1; the negative pole of this diode S is connected with the first end of the first resistance R1; the positive pole of this diode S is connected with second end of load R, thus the second electric capacity C2 can be replaced to connect with the first resistance R1 eliminate the self induction voltage of load R by reverse diode S.
Because power supply M1 is DC power supply, therefore, the first electric capacity C1 in the present embodiment can be electrochemical capacitor, if power supply M1 is constant DC power supply certainly, then the first electric capacity C1 can adopt other electric capacity, as polarity free capacitor, but, when power supply M1 is Voltage pulsating direct-current supply, then need electrochemical capacitor to eliminate the crest voltage of power supply M1, therefore, the first electric capacity C1 is required to be electrochemical capacitor.Now, the range of capacity of the first electric capacity C1 is 0.05 μ F ~ 1000 μ F, is preferably 1 μ F.
In the present embodiment, the Standard resistance range of the first resistance R1 is 10 Ω ~ 3000 Ω, is preferably 100 Ω; The Standard resistance range of the second resistance R2 is 10K Ω ~ 2000K Ω, is preferably 1000K Ω.
The relay protection circuit that the present embodiment provides; when relay power or power-off; the self induction voltage at relay two ends can due to the charging of the first electric capacity in the first circuit absorb and the first resistance consumption and decay totally; and; because load is in parallel with the first resistance and second circuit; therefore; the self induction voltage of load can be eliminated by the diode in the first resistance and second circuit, thus avoid and cause relay contact to burn distortion due to the existence of self induction voltage and damage the problem of the electric heating appliances such as electric cooker.In addition, because the first electric capacity and the second resistance constitute discharge loop, therefore, the electricity in the first electric capacity after charging by the second resistance consumption totally, thus can limit the impact of the first capacitor discharge to relay.
Another embodiment of the present utility model provides a kind of electric cooker; comprise the relay protection circuit that as above any embodiment provides; due to this protective circuit can protection relay and heater by the impact of self induction voltage; therefore; avoid the problem causing electric cooker to damage due to the existence of self induction voltage, practicality and reliability are all better.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (11)
1. a relay protection circuit, the first end of described relay is connected with the positive pole of power supply, and the second end of described relay is connected with the first end of load, and the second end of described load is connected with the negative pole of power supply, it is characterized in that, described protective circuit comprises:
First circuit in parallel with described relay, described first circuit comprises first electric capacity and the first resistance of connecting successively, the first end of described first electric capacity is connected with the first end of described relay, second end of described first electric capacity is connected with the first end of described first resistance, second end of described first resistance is connected with the second end of described relay, and the second end of described first resistance is connected with the first end of described load;
With the second resistance of described first Capacitance parallel connection, the first end of described second resistance is connected with the first end of described first electric capacity, and the second end of described second resistance is connected with the second end of described first electric capacity;
The second circuit in parallel with described load, described second circuit comprise described first resistance and with the second electric capacity of described first resistant series or diode, and the first end of described second electric capacity or diode is connected with the first end of described first resistance, the second end of described second electric capacity or diode is connected with the second end of described load.
2. protective circuit according to claim 1; it is characterized in that; when described power supply is AC power; described second circuit comprises described first resistance and the second electric capacity with described first resistant series; the first end of described second electric capacity is connected with the first end of described first resistance, and the second end of described second electric capacity is connected with the second end of described load.
3. protective circuit according to claim 2, is characterized in that, described protective circuit also comprises:
Three electric capacity in parallel with described relay and load, the first end of described 3rd electric capacity is connected with the first end of described relay, and described second end of the 3rd electric capacity is connected with the second end of described load.
4. protective circuit according to claim 3, is characterized in that, described first electric capacity, the second electric capacity and the 3rd electric capacity are polarity free capacitor.
5. protective circuit according to claim 4, is characterized in that, the range of capacity of described first electric capacity is 0.2 μ F ~ 5 μ F, and the range of capacity of described second electric capacity is 0.01 μ F ~ 2 μ F, and the range of capacity of described 3rd electric capacity is 0.2 μ F ~ 20 μ F.
6. protective circuit according to claim 1; it is characterized in that; when described power supply is DC power supply; described second circuit comprises described first resistance and the diode with described first resistant series; and the negative pole of described diode is connected with the first end of described first resistance, the positive pole of described diode is connected with the second end of described load.
7. protective circuit according to claim 6, is characterized in that, described first electric capacity is electrochemical capacitor.
8. protective circuit according to claim 7, is characterized in that, the range of capacity of described first electric capacity is 0.05 μ F ~ 1000 μ F.
9. the protective circuit according to claim 5 or 8, is characterized in that, the Standard resistance range of described first resistance is 10 Ω ~ 3000 Ω, and the Standard resistance range of described second resistance is 10K Ω ~ 2000K Ω.
10. protective circuit according to claim 1, is characterized in that, described load is heater.
11. 1 kinds of electric cookers, is characterized in that, comprise the relay protection circuit described in any one of claim 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420648669.7U CN204179018U (en) | 2014-10-31 | 2014-10-31 | Relay protection circuit and electric cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420648669.7U CN204179018U (en) | 2014-10-31 | 2014-10-31 | Relay protection circuit and electric cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204179018U true CN204179018U (en) | 2015-02-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420648669.7U Active CN204179018U (en) | 2014-10-31 | 2014-10-31 | Relay protection circuit and electric cooker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204179018U (en) |
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2014
- 2014-10-31 CN CN201420648669.7U patent/CN204179018U/en active Active
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| GR01 | Patent grant |