CN214375962U - Control circuit of commercial soybean milk machine - Google Patents
Control circuit of commercial soybean milk machine Download PDFInfo
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- CN214375962U CN214375962U CN202120635757.3U CN202120635757U CN214375962U CN 214375962 U CN214375962 U CN 214375962U CN 202120635757 U CN202120635757 U CN 202120635757U CN 214375962 U CN214375962 U CN 214375962U
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Abstract
The utility model discloses a control circuit of commercial soybean milk machine, belong to life electrical apparatus field, the problem of load end short circuit lead to components and parts easily overheated burning out has been solved, the technical scheme who solves this problem mainly includes voltage stabilizing circuit and overcurrent protection circuit, voltage stabilizing circuit includes the switch chip, overcurrent protection circuit includes first switch element and second switch element, two terminals that can switch on or break off on the first switch element respectively with control circuit's input, the oscillation pin electricity of switch chip is connected, two terminals that can switch on or break off on the second switch element respectively with another terminal of first switch element, control circuit's output electricity is connected, control circuit's output voltage is Vout, another terminal of second switch element is connected with the load circuit electricity and voltage is Vb3, Vb3 ≈ Vout and Vb3 are little than Vout. The utility model discloses mainly used protection control circuit's power device can not overheated burnout when the short circuit condition appears in the light-emitting strip.
Description
Technical Field
The utility model relates to a life electrical apparatus, especially a control circuit of commercial soybean milk machine.
Background
In current commercial soybean milk machine, can set up the advertising light boxes on the quick-witted door, for advertising light boxes's visual effect is better, can install the light strip in advertising light boxes the inside to control light strip work through corresponding control circuit. When the short circuit condition of the light-emitting strip occurs, the temperature of a power device of the control circuit can be rapidly increased, and potential safety hazards such as smoking, fire and the like can occur.
SUMMERY OF THE UTILITY MODEL
The utility model aims to reach provides a control circuit of commercial soybean milk machine, and protection control circuit's power device can not overheated burnout when the short circuit condition appears in the light-emitting strip.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a control circuit of a commercial soybean milk machine comprises a voltage stabilizing circuit and an overcurrent protection circuit, wherein the voltage stabilizing circuit comprises a switch chip, the overcurrent protection circuit comprises a first switch element and a second switch element, the first switch element and the second switch element are both three-terminal transistors, two terminals which can be conducted or disconnected on the first switch element are respectively and electrically connected with an input end of the control circuit and an oscillation pin of the switch chip, two terminals which can be conducted or disconnected on the second switch element are respectively and electrically connected with the other terminal of the first switch element and an output end of the control circuit, the voltage of the output end of the control circuit is Vout, the other terminal of the second switch element is electrically connected with a load circuit and has the voltage of Vb3, 3 is approximately equal to Vout, and Vb3 is smaller than Vout, the abnormal drop of Vout enables the second switch element to be conducted, and further enables the first switch element to be conducted, so that the voltage of the input end of the control circuit is loaded to the oscillation pin to enable the switch chip to stop working.
Furthermore, the first switch element is a PNP type triode, a C pole of the PNP type triode is electrically connected to an oscillation pin of the switch chip, an E pole of the PNP type triode is electrically connected to an input end of the control circuit, a B pole of the PNP type triode is electrically connected to the second switch element, and a pull-up resistor is electrically connected between the E pole and the B pole of the PNP type triode.
Furthermore, the first switching element is a P-channel MOS transistor, a D pole of the P-channel MOS transistor is electrically connected to an oscillation pin of the switching chip, an S pole of the P-channel MOS transistor is electrically connected to an input end of the control circuit, a G pole of the P-channel MOS transistor is electrically connected to the second switching element, and a pull-up resistor is electrically connected between the S pole and the G pole of the P-channel MOS transistor.
Further, the second switching element is an NPN type triode, an E pole of the NPN type triode is electrically connected to the output end of the control circuit, a C pole of the NPN type triode is electrically connected to the first switching element, and a B pole of the NPN type triode is electrically connected to the load circuit.
Furthermore, the second switching element is an N-channel MOS transistor, an S-pole of the N-channel MOS transistor is electrically connected to the output terminal of the control circuit, a D-pole of the N-channel MOS transistor is electrically connected to the first switching element, and a G-pole of the N-channel MOS transistor is electrically connected to the load circuit.
Further, the load circuit includes an eighth resistor and a ninth resistor for voltage division, a driving power supply of the load circuit is grounded via the eighth resistor and the ninth resistor, and the other terminal of the second switching element is electrically connected between the eighth resistor and the ninth resistor.
Furthermore, the input end of the control circuit is electrically connected with the eighth resistor as a driving power supply of the load circuit.
Further, the oscillation pin of the switch chip is grounded through a timing capacitor, and the first switch element is electrically connected between the timing capacitor and the oscillation pin.
Furthermore, a driving power supply of the voltage stabilizing circuit is connected with a first diode and an active capacitor, and an input end of the control circuit is connected between the first diode and the active capacitor.
Furthermore, the second switching element is replaced by a voltage comparator, the output end of the voltage comparator is electrically connected with the other terminal of the first switching element, the input end of the voltage comparator is electrically connected with the output end of the control circuit, the input end of the voltage comparator is electrically connected with the load circuit, the voltage of the input end is Vb4, the voltage of the output end of the control circuit is Vout, Vb4 is approximately equal to Vout, Vb4 is smaller than Vout, the abnormal drop of Vout is lower than Vb4, the output end of the voltage comparator outputs low level, the first switching element is further conducted, and therefore the voltage of the input end of the control circuit is loaded on the oscillation pin to stop the operation of the switching chip.
After the technical scheme is adopted, the utility model has the advantages of as follows: when the light-emitting strip connected with the output end of the control circuit is in a short-circuit condition, the voltage Vout of the output end of the control circuit is reduced and is obviously lower than Vb3, the second switch element is conducted, the first switch element is conducted, and therefore the voltage of the input end of the control circuit is loaded to the oscillation pin to stop the switch chip from working, and therefore the power device of the control circuit is protected from being burnt out due to overheating. The second switch element is directly electrically connected with the output end of the control circuit, the voltage of the input end of the control circuit is reduced to directly enable the second switch element to be conducted, the whole process of the protection function is realized, the response is rapid, when the light-emitting strip returns to be normal, the load impedance returns to be normal, Vout rises to exceed Vb3, the second switch element is disconnected again, the first switch element is further disconnected, the switch chip can work normally, and the whole control circuit can automatically recover after the fault of the light-emitting strip is eliminated.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
fig. 1 is a schematic diagram of a control circuit of a commercial soymilk machine according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a control circuit of a commercial soymilk machine in the fourth embodiment of the present invention;
fig. 3 is a schematic view of a commercial soymilk machine of the present invention.
Detailed Description
The first embodiment is as follows:
as shown in figure 3, the commercial soymilk machine comprises a machine body 1 and a machine door 11, wherein an advertising lamp box 12 is arranged on the front side of the machine door 11, and for better visual effect of the advertising lamp box 12, a light-emitting strip is arranged in the advertising lamp box 12 and is controlled to work by a corresponding control circuit. Specifically, as shown in fig. 1, the control circuit of a commercial soymilk machine comprises a voltage stabilizing circuit 100 and an overcurrent protection circuit 200, wherein the voltage stabilizing circuit 100 comprises a switch chip U1, the overcurrent protection circuit 200 comprises a first switch element and a second switch element, both the first switch element and the second switch element are three-terminal transistors, two terminals which can be switched on or off on the first switch element are respectively and electrically connected with an input terminal of the control circuit and an oscillation pin TC of a switch chip U1, two terminals which can be switched on or off on the second switch element are respectively and electrically connected with the other terminal of the first switch element and an output terminal of the control circuit, an output terminal of the control circuit has a voltage Vout, the other terminal of the second switch element is electrically connected with a load circuit and has a voltage Vb3, Vb3 is approximately equal to Vout and Vb3 is smaller than Vout, and the Vout abnormally drops to switch on the second switch element so as to switch on the first switch element, Therefore, the input end voltage Vin of the control circuit is loaded to the oscillation pin TC to stop the operation of the switch chip U1. When the light-emitting strip connected with the output end of the control circuit is in a short circuit condition, the voltage Vout of the output end of the control circuit is reduced and is obviously lower than Vb3, the second switch element is conducted, the first switch element is conducted, and therefore the voltage Vin of the input end of the control circuit is loaded to the oscillation pin TC to enable the switch chip U1 to stop working, and therefore the power device of the control circuit is protected from being burnt out due to overheating. The second switch element is directly electrically connected with the output end of the control circuit, the voltage Vin at the input end of the control circuit is reduced to directly enable the second switch element to be conducted, the whole process of the protection function is quick in response, when the light-emitting strip returns to be normal, the load impedance returns to be normal, Vout rises to exceed Vb3, the second switch element is disconnected again, the first switch element is further disconnected, the switch chip U1 can work normally, and the whole control circuit can automatically recover after the light-emitting strip is cleared of faults. Vb3 is smaller than Vout and the difference is not large in general, and can be determined according to the actual magnitude of the voltage at the output end of the control circuit.
As a possible solution, the first switching element in this embodiment is a PNP transistor Q2, a C electrode of the PNP transistor Q2 is electrically connected to the oscillation pin TC of the switching chip U1, an E electrode is electrically connected to the input terminal of the control circuit, a B electrode is electrically connected to the second switching element, and a pull-up resistor R6 is electrically connected between the E electrode and the B electrode of the PNP transistor Q2. When the second switching element is in an off state, a voltage Vb2 of a B pole of the PNP transistor Q2 is equal to Vin, and when the second switching element is in an on state, under the influence of the pull-up resistor R6, Vb2 < Vin and a difference value exceeds an on voltage of the PNP transistor Q2, so that the PNP transistor Q2 is turned on.
Specifically, the second switching element in this embodiment is an NPN transistor Q3, an E electrode of the NPN transistor Q3 is electrically connected to the output terminal of the control circuit, a C electrode of the NPN transistor Q3 is electrically connected to a B electrode of the PNP transistor Q2, and the B electrode of the NPN transistor Q3 is electrically connected to the load circuit. Since Vb3 remains substantially unchanged, when Vout drops sufficiently to turn on Q3, Q3 turns on, which causes Vb2 to drop, and then Q2 turns on in saturation,
in order to set Vb3 to meet the conditions that Vb3 ≈ Vout and Vb3 is smaller than Vout, the load circuit includes an eighth resistor R8 and a ninth resistor R9 for voltage division, a driving power supply of the load circuit is grounded through the eighth resistor R8 and the ninth resistor R9, and a B electrode of the NPN-type triode Q3 is electrically connected between the eighth resistor R8 and the ninth resistor R9. The Vb3 can be easily controlled to meet the conditions by designing the resistance values of the eighth resistor R8 and the ninth resistor R9, and the load circuit is simple in structure, not prone to failure and capable of guaranteeing the stability of the voltage Vb 3. In order to simplify the circuit, the input terminal of the control circuit may be directly electrically connected to the eighth resistor R8 as a driving power source of the load circuit.
The oscillation pin TC of the switch chip U1 is grounded through the timing capacitor C4, and the first switching element is electrically connected between the timing capacitor C4 and the oscillation pin TC.
The driving power supply of the voltage stabilizing circuit 100 is connected with a first diode D1 and a polar capacitor C2, and the input end of the control circuit is connected between the first diode D1 and the polar capacitor C2.
Example two:
besides adopting the PNP type triode Q2, the first switching element can also select a P-channel MOS transistor, specifically, the D-pole of the P-channel MOS transistor is electrically connected to the oscillation pin TC of the switching chip U1, the S-pole is electrically connected to the input terminal of the control circuit, the G-pole is electrically connected to the second switching element, and the pull-up resistor R6 is electrically connected between the S-pole and the G-pole of the P-channel MOS transistor.
Other contents not described in this embodiment may refer to embodiment one.
Example three:
in addition to the NPN transistor Q3, the second switching element may also be an N-channel MOS transistor, specifically, the N-channel MOS transistor is connected to the output terminal of the control circuit at its S-pole, the first switching element at its D-pole, and the load circuit at its G-pole.
The present embodiment can also be implemented in combination with the embodiments.
Other contents not described in this embodiment may refer to embodiment one.
Example four:
as shown in fig. 2, in addition to using the NPN type triode Q3 and the N-channel MOS transistor, the second switching element may also be replaced by a voltage comparator U2, the output terminal of the voltage comparator U2 is electrically connected to the other terminal of the first switching element, the "+" input terminal of the voltage comparator U2 is electrically connected to the output terminal of the control circuit, the "-" input terminal of the voltage comparator U2 is electrically connected to the load circuit, the voltage of the "-" input terminal is Vb4, the output terminal of the control circuit is Vout, Vb4 ≈ Vout and Vb4 is smaller than Vout, an abnormal drop of Vout is lower than Vb4 to make the output terminal of the voltage comparator U2 output a low level, thereby making the first switching element conductive, and making the input terminal voltage of the control circuit load to the oscillation pin TC to stop the operation of the switching chip U1.
Other contents not described in this embodiment may refer to the first embodiment and the second embodiment.
In addition to the preferred embodiments described above, other embodiments of the present invention are also possible, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope of the present invention defined by the appended claims.
Claims (10)
1. A control circuit of a commercial soymilk machine comprises a voltage stabilizing circuit and an overcurrent protection circuit, wherein the voltage stabilizing circuit comprises a switch chip, the overcurrent protection circuit is characterized by comprising a first switch element and a second switch element, wherein the first switch element and the second switch element are both three-terminal transistors, two terminals which can be conducted or disconnected on the first switch element are respectively and electrically connected with an input end of a control circuit and an oscillation pin of a switch chip, two terminals which can be conducted or disconnected on the second switch element are respectively and electrically connected with the other terminal of the first switch element and an output end of the control circuit, the voltage of the output end of the control circuit is Vout, the other terminal of the second switch element is electrically connected with a load circuit, the voltage is Vb3, Vb3 is approximately equal to Vout, the Vvb 3 is smaller than Vout, and due to abnormal drop of the Vout, the second switch element is conducted, the first switch element is further conducted, and the voltage of the input end of the control circuit is loaded to the oscillation pin to stop the operation of the switch chip.
2. The control circuit of the commercial soymilk machine according to claim 1, wherein the first switching element is a PNP type triode, the C pole of the PNP type triode is electrically connected with the oscillation pin of the switching chip, the E pole of the PNP type triode is electrically connected with the input end of the control circuit, the B pole of the PNP type triode is electrically connected with the second switching element, and a pull-up resistor is electrically connected between the E pole and the B pole of the PNP type triode.
3. The control circuit of the commercial soymilk machine according to claim 1, wherein the first switching element is a P-channel MOS tube, the D pole of the P-channel MOS tube is electrically connected to the oscillation pin of the switching chip, the S pole is electrically connected to the input end of the control circuit, the G pole is electrically connected to the second switching element, and a pull-up resistor is electrically connected between the S pole and the G pole of the P-channel MOS tube.
4. The control circuit of the commercial soymilk machine according to claim 2 or 3, characterized in that the second switching element is an NPN-type triode, the E pole of the NPN-type triode is electrically connected to the output end of the control circuit, the C pole of the NPN-type triode is electrically connected to the first switching element, and the B pole of the NPN-type triode is electrically connected to the load circuit.
5. The control circuit of the commercial soymilk machine according to claim 2 or 3, characterized in that the second switching element is an N-channel MOS tube, the S pole of the N-channel MOS tube is electrically connected to the output end of the control circuit, the D pole is electrically connected to the first switching element, and the G pole is electrically connected to the load circuit.
6. The control circuit of a commercial soymilk machine according to claim 1, characterized in that the load circuit comprises an eighth resistor and a ninth resistor for voltage division, the driving power supply of the load circuit is grounded through the eighth resistor and the ninth resistor, and the other terminal of the second switching element is electrically connected between the eighth resistor and the ninth resistor.
7. The control circuit of the commercial soymilk machine according to claim 6, characterized in that the input end of the control circuit is electrically connected with the eighth resistor as the driving power supply of the load circuit.
8. The control circuit of a commercial soymilk machine according to claim 1, characterized in that the oscillation pin of said switch chip is grounded through a timing capacitor, and the first switch element is electrically connected between the timing capacitor and the oscillation pin.
9. The control circuit of the commercial soymilk machine according to claim 1, characterized in that the driving power supply of the voltage stabilizing circuit is connected with a first diode and a polar capacitor, and the input end of the control circuit is connected between the first diode and the polar capacitor.
10. The control circuit of a commercial soymilk machine according to claim 2 or 3, characterized in that the second switching element is replaced by a voltage comparator, the output terminal of the voltage comparator is electrically connected with the other terminal of the first switching element, the "+" input terminal of the voltage comparator is electrically connected with the output terminal of the control circuit, the "-" input terminal of the voltage comparator is electrically connected to the load circuit, the voltage of the "-" input terminal is Vb4, the output terminal voltage of the control circuit is Vout, Vb4 ≈ Vout and Vb4 is smaller than Vout, the abnormal drop of Vout is lower than Vb 25 to make the output terminal of the voltage comparator output low level, further make the first switching element conduct, thereby making the input terminal voltage of the control circuit load to the oscillation pin 353535 4 to stop the operation of the switch chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120635757.3U CN214375962U (en) | 2021-03-29 | 2021-03-29 | Control circuit of commercial soybean milk machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120635757.3U CN214375962U (en) | 2021-03-29 | 2021-03-29 | Control circuit of commercial soybean milk machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214375962U true CN214375962U (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120635757.3U Active CN214375962U (en) | 2021-03-29 | 2021-03-29 | Control circuit of commercial soybean milk machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214375962U (en) |
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2021
- 2021-03-29 CN CN202120635757.3U patent/CN214375962U/en active Active
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