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CN-224204760-U - Protection detection circuit and coffee machine

CN224204760UCN 224204760 UCN224204760 UCN 224204760UCN-224204760-U

Abstract

The application discloses a protection detection circuit and a coffee machine, wherein the protection detection circuit comprises a switch unit, a single-pole double-throw switch, a signal output unit and a signal output unit, wherein the first end of the switch unit is connected with a target chip, the second end of the switch unit is connected with a zero line, the zero line is connected with a first direct current power supply, the switch unit can enter a conducting state under the condition that a starting signal of the target chip to a target load is received, the single-pole double-throw switch comprises a public end, a normal open end, a normal closed end and a disconnecting link, the disconnecting link can enable the public end to be conducted with the normal open end or enable the public end to be conducted with the normal open end, the public end is connected with the zero line, the normal open end is connected with a third end of the switch unit, the fourth end of the switch unit is connected with a zero line access end of the target load, the third end and the fourth end of the switch unit are conducted after the switch unit enters the conducting state, the first end of the signal output unit is connected with the normal open end, and the second end of the signal output unit is connected with the target chip. Therefore, the dual functions of safety protection and signal detection are realized by a simple circuit structure, and the cost is reduced.

Inventors

  • GUO JIANGANG
  • LU GUOFANG

Assignees

  • 广东新宝电器股份有限公司

Dates

Publication Date
20260505
Application Date
20250425

Claims (10)

  1. 1. A protection detection circuit, comprising: The first end of the switch unit is connected with the target chip, the second end of the switch unit is connected with a zero line, the zero line is connected with a first direct current power supply, and the switch unit can enter a conducting state under the condition that a starting signal of the target chip to a target load is received; The single-pole double-throw switch comprises a public end, a normally-open end, a normally-closed end and a disconnecting link, wherein the disconnecting link can enable the public end to be conducted with the normally-closed end or enable the public end to be conducted with the normally-open end, the public end is connected with the zero line, the normally-closed end is connected with the third end of the switch unit, the fourth end of the switch unit is connected with the zero line access end of the target load, and the third end and the fourth end of the switch unit are conducted after the switch unit enters a conducting state; and the first end of the signal output unit is connected with the normally open end, and the second end of the signal output unit is connected with the target chip.
  2. 2. The protection detection circuit of claim 1, wherein the switching unit comprises a first triode and a relay, wherein a base electrode of the first triode is connected with a first end of a coil of the relay, a collector electrode of the first triode is connected with a first end of the coil of the relay, an emitter electrode of the first triode is grounded, a second end of the coil of the relay is a second end of the switching unit, a first end of a switch of the relay is a third end of the switching unit, and a second end of the switch of the relay is a fourth end of the switching unit.
  3. 3. The protection detection circuit of claim 2, wherein the switching unit further comprises a diode, an anode of the diode being connected to a first end of the coil of the relay, and a cathode of the diode being connected to the zero line.
  4. 4. The protection detection circuit of claim 2, wherein the switching unit further comprises a first resistor and a second resistor, a base of the first triode is connected to the first end of the switching unit through the first resistor, one end of the second resistor is connected to the base of the first triode, and the other end of the second resistor is grounded.
  5. 5. The protection detection circuit according to claim 2, wherein the switch unit further includes a third resistor, a fourth resistor, a fifth resistor, and a first capacitor, one end of the third resistor is connected to the first end of the switch of the relay, one end of the fourth resistor and the other end of the third resistor are connected to one end of the first capacitor in common, the other end of the fourth resistor is connected to one end of the fifth resistor, and the other end of the fifth resistor and the other end of the first capacitor are connected to the second end of the switch of the relay.
  6. 6. The protection detection circuit according to claim 1, wherein the signal output unit includes a second triode and a sixth resistor, a base electrode of the second triode is connected to the first end of the signal output unit, a collector electrode of the second triode is the second end of the signal output unit, one end of the sixth resistor is connected to a second direct current power supply, the other end of the sixth resistor is connected to a collector electrode of the second triode, and an emitter electrode of the second triode is grounded.
  7. 7. The protection detection circuit of claim 6, wherein the signal output unit further comprises a seventh resistor, an eighth resistor, and a second capacitor, the seventh resistor being connected in series between the base of the second transistor and the first end of the signal output unit, one end of the eighth resistor and one end of the second capacitor being connected to the base of the second transistor, and the other end of the eighth resistor and the other end of the second capacitor being grounded.
  8. 8. The protection detection circuit of claim 1, further comprising: And the fuse is connected in series between the fourth end of the switch unit and the zero line access end.
  9. 9. The protection detection circuit of claim 8, wherein the fuse is a self-healing fuse.
  10. 10. A coffee machine comprising the protection detection circuit of claim 1, further comprising: The coffee machine comprises a cavity, a public end, a normally-closed end, a normally-open end, a knife switch, a cover body, a switch and a switch, wherein the cavity can accommodate coffee beans, the cavity is provided with the cover body capable of covering the cavity, and the public end is communicated with the normally-closed end through the knife switch when the cover body is in a closed state; The grinding component is arranged in the cavity and is used for grinding coffee beans; and the motor is used as the target load and connected with the grinding assembly and used for driving the grinding assembly.

Description

Protection detection circuit and coffee machine Technical Field The application relates to the technical field of household appliances, in particular to a protection detection circuit and a coffee machine. Background In order to ensure safety, some household appliances are provided with a protection circuit and a detection circuit, and the driving device of the rotating assembly can be immediately stopped through the protection circuit under the condition that the rotating assembly is exposed to the environment, so that the rotating assembly is prevented from damaging a user, and corresponding signals are output to a control chip of the household appliance through the detection circuit. At present, a protection circuit and a detection circuit are generally arranged respectively, the circuit is complex and has higher cost, for example, patent publication No. CN211427106U discloses a control circuit of a dish washer, which comprises a gating switch, a gating detection circuit, a driving circuit and a switching device, wherein the gating switch comprises a normally-closed gating switch which is connected or disconnected along with the opening and closing of a door of the dish washer, the gating detection circuit is connected with the gating switch and outputs a first electric signal when the door is closed and outputs a second electric signal when the door is opened, the driving circuit is connected with the gating detection circuit and amplifies the first electric signal when the door is opened, the switching device is connected with the driving circuit and is controllably connected or disconnected according to the signal output by the driving circuit, the switching device is connected according to the amplified first electric signal so as to be connected with the power supply of the commercial power to the load of the dish washer, and the switching device is controlled to be disconnected when the driving circuit receives the second electric signal output by the gating detection circuit so as to disconnect the power supply of the commercial power to the load. It can be seen that the gate control switch, the gate control detection circuit, the driving circuit and the switching device are required to be arranged, the circuit is complex, and the cost is high. Disclosure of utility model The embodiment of the application provides a protection detection circuit and a coffee machine, wherein a common end of a single-pole double-throw switch is connected with a zero line, a normally closed end of the single-pole double-throw switch is connected with a third end of a switch unit, a fourth end of the switch unit is connected with a zero line access end of a target load, a normally open end of the single-pole double-throw switch is connected with a signal output unit, and a first direct current power supply is connected to the zero line so as to reduce the complexity of the circuit on the basis of realizing the functions of safety protection and signal detection. The protection detection circuit comprises a switch unit, a single-pole double-throw switch, a signal output unit and a signal output unit, wherein the first end of the switch unit is connected with a normal-closed end or the common end of the switch unit is connected with the normal-open end, the common end of the switch unit is connected with a zero line, the second end of the switch unit is connected with a zero line access end of a target load, the third end and the fourth end of the switch unit are connected after the switch unit enters the on state, the single-pole double-throw switch comprises the common end, the normal-open end, the normal-closed end and the disconnecting link, the common end of the disconnecting link can be connected with the normal-closed end or the normal-open end, the normal-closed end of the common end is connected with the zero line, the fourth end of the switch unit is connected with a zero line access end of the target load, and the third end and the fourth end of the switch unit are connected after the switch unit enters the on state. In some embodiments, the switching unit includes a first triode and a relay, a base of the first triode is connected to a first end of the switching unit, a collector of the first triode is connected to a first end of a coil of the relay, an emitter of the first triode is grounded, a second end of the coil of the relay is a second end of the switching unit, a first end of a switch of the relay is a third end of the switching unit, and a second end of the switch of the relay is a fourth end of the switching unit. Through setting up first triode and relay, realize making the switch unit reliable break-make, guaranteed the reliability of switch unit. In some embodiments, the switching unit further includes a diode, an anode of the diode is connected to a first end of the coil of the relay, and a cathode of the diode is connected to the zero line. By arranging the diode, the reverse electromotive for