Power supply protection circuit and power supply protection method of electrolysis generation device

Abstract

The invention provides a power supply protection circuit and a power supply protection method for an electrolysis generation device. The power supply protection circuit comprises a main control module, a state monitoring module and a switch control module. According to the invention, the state monitoring module outputs high and low levels to detect the working state of the electrode module, the switch control module controls the on-off of the power supply circuit, and the state monitoring mode replaces a traditional current acquisition mode, so that the working state of the electrode module is more accurate; the problem of protection failure or false triggering caused by inaccurate current sampling is effectively avoided, and compared with the adoption of a precise current acquisition chip, the cost is lower.

Description

Technical Field

[0001] The present invention relates to the field of circuit design, and particularly to a power supply protection circuit and a power supply protection method for an electrolysis generating device. Background Art

[0002] With the development of technologies in the small household appliance field, the electrolyzed water technology is increasingly used in the design of small household appliances. The electrolyzed water technology electrolyzes water or salts in water through electrodes to generate negative oxygen ions, hydroxide ions, etc. These ions have high permeability and the function of decomposing and adsorbing stains and dust, thereby achieving the cleaning and sterilization effects.

[0003] Currently, most floor washing machine products on the market use an electrolyzed water generating device for sterilization and disinfection functions. The electrolyzed water generating device usually includes an electrolytic cell and an electrode module. By applying power to the electrode module placed in the electrolyte, electrolysis is achieved. However, the working current of the existing electrolyzed water generating device is unstable, often resulting in damage to the controller, especially the circuit that controls the power supply to the electrolyzed water.

[0004] In order to achieve the protection of the power supply circuit, the following several methods are usually adopted in the prior art:

[0005] (1) As shown in the appendix Figure 1 , a power supply MOS is set in the power supply circuit, and at the same time, the current of the current acquisition module is collected. When the collected current value is greater than the protection value, the main control module turns off the power supply MOS, thereby playing a protection role; but usually, the working current of the electrolyzed water generating device is small. By sampling the electrolyzed water working current through a resistor, the current sampling deviation is large, and the current value that is expected to be obtained cannot be accurately collected. Furthermore, due to the large current acquisition error, the current protection effect cannot be achieved.

[0006] (2) On the basis of the above method, as shown in the appendix Figure 2 , the method of sampling the current with a sampling resistor and adding a comparator is used to achieve it. To a certain extent, it can effectively prevent the overcurrent and short - circuit working scenarios of the electrolyzed water module. However, the biggest drawback of this method is that it is prone to false triggering. A pulsed current can easily cause false triggering, and consumers often encounter the situation where the electrolyzed water module is protected during use.

[0007] (3) Using a precise current acquisition chip. Although this method can reduce errors and avoid false triggering, the cost of collecting current is often very high, and the cost is 1 - 2 times that of the traditional solution. It is often unrealistic to apply it to consumer electronic products such as floor washing machines. Summary of the Invention

[0008] To solve the above problems, the present invention proposes a power supply protection circuit and a power supply protection method for an electrolysis generating device.

[0009] The main content of the present invention includes:

[0010] A power supply protection circuit for an electrolysis generating device, the electrolysis generating device includes an electrolytic cell, an electrode module, and a power supply circuit for supplying power to the electrode module, and the short - circuit protection circuit includes:

[0011] A main control module;

[0012] A status monitoring module, connected to the main control module, and the status monitoring module outputs a feedback signal to the main control module according to the working status of the electrode module;

[0013] A switch control module, connected to the main control module, and the switch control module is arranged on the power supply circuit; the main control module controls the on - off of the power supply circuit through the switch control module according to the feedback signal transmitted by the status detection module;

[0014] Wherein, the working status of the electrode module includes a normal status, an over - current status, and a short - circuit status; the feedback signal output by the status monitoring module is a high level or a low level.

[0015] Preferably, the status monitoring module includes an over - current monitoring unit and a short - circuit monitoring unit. The over - current unit is connected in series on the power supply circuit. The short - circuit monitoring unit includes a monitoring access end, a monitoring output end, and a monitoring main unit connected between the monitoring access end and the monitoring output end. The monitoring input end is connected to the power supply circuit, and the monitoring output end is connected to the main control module; the monitoring main unit is used to output a corresponding feedback signal to the main control module through the detection output end according to the working status of the electrode module.

[0016] Preferably, the over - current unit is a PTC thermistor.

[0017] Preferably, the monitoring main unit includes a monitoring switch, and the monitoring switch outputs a corresponding feedback signal to the monitoring output end according to the input signal of the monitoring access end.

[0018] Preferably, the monitoring switch is an NPN - type triode. The base of the monitoring switch is connected to the monitoring input end through a shunt resistor. The collector of the monitoring switch is connected to the power supply through a first current - limiting resistor; the collector of the monitoring switch is connected to the monitoring output end through a second current - limiting resistor, and its emitter is grounded.

[0019] Preferably, the switch control module includes a switch input terminal, a first switch, and a second switch; the first switch is connected to the switch input terminal, and the second switch is arranged on the power supply circuit; according to the feedback signal of the state monitoring module, the main control module transmits a control signal to the first switch through the switch input terminal, controls the on / off of the second switch by controlling the on / off of the first switch, and controls the on / off of the power supply circuit by controlling the on / off of the second switch.

[0020] Preferably, the first switch is an NPN-type triode, and the second switch is a PMOS transistor; the base of the first switch is connected to the switch input terminal through a first protection resistor and a first protection diode; the collector of the first switch is connected to the gate of the second switch through a first current-limiting resistor, and the emitter of the first switch is grounded; the drain and source of the second switch are connected to the power supply circuit.

[0021] Preferably, an enable control module is further included, the enable control module is connected to the main control module and the power supply circuit, and the enable control module includes an enable input terminal; when the working state is a short-circuit state, the main control module transmits an enable signal to the power supply circuit through the enable input terminal, so that the state monitoring module outputs a high level to the main control module.

[0022] Preferably, the enable control module includes a first enable switch and a second enable switch; the first enable switch is an NPN-type triode, the second enable switch is a PNP-type triode, the base of the first enable switch is connected to the enable input terminal through a first enable resistor and an enable diode, its collector is connected to the base of the second enable switch through a second enable resistor, the emitter of the second enable switch is connected to the positive pole of the power supply circuit, and its collector is connected to the positive pole of the electrode module through a protection resistor; the emitter of the first enable switch is grounded.

[0023] The present invention also provides a power supply protection method for an electrolysis generation device, including the following steps:

[0024] Configure the power supply protection circuit of the electrolysis generation device as described above on the power supply circuit of the electrolysis generation device;

[0025] In the normal state, the state monitoring module obtains the voltage signal of the electrode module and outputs a low level to the main control module; the main control module transmits a high level through the switch control module to control the conduction of the power supply circuit;

[0026] In the short-circuit state, the state monitoring module obtains the voltage signal of the electrode module and outputs a high level to the main control module; the main control module transmits a low level through the switch control module to control the disconnection of the power supply circuit;

[0027] In an overcurrent state, the state monitoring module increases the resistance of the power supply circuit to the current transmitted to the electrode module.

[0028] The beneficial effects of the present invention are as follows: The present invention proposes a power supply protection circuit and a power supply protection method for an electrolytic generation device. The state monitoring module outputs high and low levels to detect the working state of the electrode module, and the switch control module controls the on and off of the power supply circuit. The state monitoring method of the present invention replaces the traditional current acquisition method, making the working state of the electrode module more accurate, effectively avoiding the problems of protection failure or false triggering caused by inaccurate current sampling, and having a lower cost compared to using a precision current acquisition chip. Description of the Drawings

[0029] Figure 1 is a schematic diagram of a power supply protection circuit in the prior art;

[0030] Figure 2 is a schematic diagram of another power supply protection circuit in the prior art;

[0031] Figure 3 is a functional block diagram of the present invention;

[0032] Figure 4 is a circuit diagram of the present invention. Detailed Embodiments

[0033] The following specifically describes the technical solutions protected by the present invention with reference to the accompanying drawings.

[0034] Please refer to Figure 3 and Figure 4 . The present invention proposes a power supply protection circuit for an electrolytic generation device, including a main control module, a state monitoring module 200, a switch control module 100, and an enable control module 300. The state monitoring module 200 is used to monitor the working state of the electrode module, including whether a short circuit occurs, whether it is working properly, and whether the supply current is too large. According to different working states, corresponding feedback signals are transmitted to the main control module. In the present invention, the power supply protection method is as follows:

[0035] The state monitoring module transmits high and low levels to the main control module. When the state monitoring module 200 outputs a low level, the main control module determines that the current is in the normal working state. When the state monitoring module 200 outputs a high level, the main control module determines that it is in a short - circuit state. At this time, the main control module controls the switch control module 100 to disconnect the power supply circuit, thereby preventing the power supply circuit from being damaged. To further ensure the safety of the power supply circuit in the short - circuit state, the main control module transmits an enable signal to the enable control module 300. The enable signal 300 makes the positive electrode of the electrode module always in a low - level state to ensure that the state monitoring module continuously detects a high level. Until the short - circuit fault is eliminated, the main control module no longer sends an enable signal to the enable control module. The state monitoring module detects a low level again, and the main control module controls the switch control module to restore power supply to the power supply circuit.

[0036] Please refer to Figure 4 , and the specific composition of each module will be introduced in detail below.

[0037] The state monitoring module 200 is connected to the main control module through the monitoring output terminal. One end of it is connected to the power supply circuit, and it outputs a feedback signal EPOWER_STATE to the main control module according to the working state of the electrode module. The state monitoring module includes an over - current monitoring unit and a short - circuit monitoring unit. The over - current unit is connected in series on the power supply circuit, and the over - current unit is a PTC thermistor PTC. When over - current occurs, the over - current unit protects the safety of the electrode module by increasing the resistance. The short - circuit monitoring unit includes a monitoring access terminal, a monitoring output terminal, and a monitoring main unit connected between the monitoring access terminal and the monitoring output terminal. The monitoring main unit is connected to the power supply circuit through the monitoring input terminal.

[0038] Specifically, the monitoring main unit includes a monitoring switch Q5. The monitoring switch Q5 is an NPN - type triode. The base of the monitoring switch Q5 is connected to the power supply circuit through shunt resistors (R20, R24) and the monitoring input terminal. Further, the monitoring input terminal is connected to the positive electrode EWATER + of the electrode module. The collector of the monitoring switch Q5 is connected to the power supply VDD through a first current - limiting resistor R25. The collector of the monitoring switch Q5 is connected to the monitoring output terminal through a second current - limiting resistor R27, and its emitter is grounded. Further still, one end of a first monitoring capacitor C13 is connected between the second current - limiting resistor R27 and the monitoring output terminal, and the other end of the first monitoring capacitor C13 is grounded. At the same time, a second monitoring capacitor C12 and a monitoring resistor R30 are connected in parallel between the base and the emitter of the monitoring switch Q5.

[0039] When the power supply circuit is working properly, the power supply circuit turns on the monitoring switch Q5. The power supply VDD connected to its collector is pulled to ground through the first current-limiting resistor R25, causing the monitoring output terminal to output a low level. The main control module thus determines that it is in the normal working state at this time.

[0040] The switch control module is connected to the main control module and is configured on the power supply circuit. The main control module controls the on / off of the power supply circuit through the switch control module according to the feedback signal EPOWER_STATE transmitted by the state detection module. Specifically, the switch control module 100 includes a switch input terminal, a first switch Q6, and a second switch Q4. The first switch Q6 is an NPN-type triode, and the second switch Q4 is a PMOS transistor. The first switch Q4 is connected to the switch input terminal and receives the control signal EWATER_CTR sent by the main control module. The second switch Q4 is configured on the power supply circuit and controls the on / off of the power supply circuit under the control of the first switch Q6. That is, the main control module, according to the feedback signal EPOWER_STATE of the state monitoring module, transmits the control signal to the first switch Q6 through the switch input terminal, controls the on / off of the second switch Q4 by controlling the on / off of the first switch Q6, and controls the on / off of the power supply circuit by controlling the on / off of the second switch Q4.

[0041] Specifically, the base of the first switch Q6 is connected to the switch input terminal through the first protection resistor R29 and the first protection diode D6. The collector of the first switch Q6 is connected to the gate of the second switch Q4 through the first current-limiting resistor R26, and the emitter of the first switch Q6 is grounded. The drain and source of the second switch Q4 are connected to the power supply circuit and are respectively connected to the positive electrode P+ of the power supply circuit and the positive electrode EWATER+ of the electrode module. Further, a filter capacitor C14 and a filter resistor R31 are connected in parallel between the base and the emitter of the first switch Q6.

[0042] The enabling control module 300 is connected to the main control module and the power supply circuit. The enabling control module 300 includes an enabling input terminal. When the working state is a short - circuit state, the main control module transmits an enabling signal to the power supply circuit through the enabling input terminal, so that the state monitoring module outputs a high level to the main control module. Specifically, the enabling control module 300 includes a first enabling switch Q8 and a second enabling switch Q7. The first enabling switch Q8 is an NPN - type triode, and the second enabling switch Q7 is a PNP - type triode. The base of the first enabling switch Q8 is connected to the enabling input terminal through a first enabling resistor R33 and an enabling diode D7. Its collector is connected to the base of the second enabling switch Q7 through a second enabling resistor R32. The emitter of the second enabling switch Q7 is connected to the positive pole P+ of the power supply circuit, and its collector is connected to the positive pole EWATER+ of the electrode module through a protection resistor R22. The emitter of the first enabling switch Q8 is grounded.

[0043] In the normal working state, the control signal EWATER_CTR sent by the main control module is at a high level, providing a bias voltage to the first switch Q6 through the first protection diode D6 and the first protection resistor R29, making the first switch Q6 conduct. At this time, the positive pole P+ of the power supply circuit divides the voltage through the power supply resistor R19, the voltage - dividing resistor R21, and the first current - limiting resistor R26 to provide a bias voltage to the second switch Q4, making the second switch Q4 conduct. Thus, the power supply circuit remains conducting and supplies power to the electrode module through the over - current unit PTC, enabling the electrolytic water generation device to start working.

[0044] When a short - circuit occurs in the electrolytic water generation device, the positive pole EWATER+ of the electrode module is pulled to the ground. At this time, the shunt resistors (R20, R24) are also pulled low, making the detection switch Q5 cut off. The power supply VDD passes through the first current - limiting resistor R25 and the second current - limiting resistor R27, making the monitoring output terminal output a high level, that is, the feedback signal EPOWER_STATE is at a high level. The main control module determines that the electrolytic generation device is in a short - circuit state and sends a low - level control signal EWATER_CTR to the switch control module through the switch input terminal, making the second switch Q4 turn off, thereby cutting off the power supply circuit and stopping the electrolytic generation device from working.

[0045] After the second switch Q4 is turned off, the main control module outputs a high level to the enable control module, and makes the first enable switch Q8 conduct through the enable diode D7 and the first enable resistor R33. After the first enable switch Q8 conducts, it provides a bias voltage for the second enable switch Q7, making the second enable switch Q7 conduct. As a result, the power supply circuit can be connected to the monitoring input terminal of the status monitoring module through the protection resistor R22. The protection resistor R22 is a large resistor, so that the monitoring input terminal of the status detection module is always at a low level, and the output of the status monitoring module is always at a high level, ensuring the stability of the protection circuit in the short-circuit state and further improving the safety of the power supply circuit.

[0046] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A power supply protection circuit for an electrolytic generation device, the electrolytic generation device comprising an electrolytic cell, an electrode module and a power supply circuit for supplying power to the electrode module, characterized in that: The short circuit protection circuit comprises: Main control module; A state monitoring module, connected to the main control module, wherein the state monitoring module outputs a feedback signal to the main control module according to the working state of the electrode module; a switch control module connected to the main control module, the switch control module being configured on the power supply circuit; the main control module controls the on and off of the power supply circuit through the switch control module according to the feedback signal transmitted by the state detection module; Among them, the working state of the electrode module includes a normal state, an overcurrent state and a short circuit state; the feedback signal output by the state monitoring module is a high level or a low level.

2. The power supply protection circuit of the electrolysis generating device according to claim 1, characterized in that: The status monitoring module includes an overcurrent monitoring unit and a short-circuit monitoring unit. The overcurrent unit is connected in series to the power supply circuit. The short-circuit monitoring unit includes a monitoring access terminal, a monitoring output terminal and a monitoring main unit connected between the monitoring access terminal and the monitoring output terminal. The monitoring input terminal is connected to the power supply circuit, and the monitoring output terminal is connected to the main control module. The monitoring main unit is used to output a corresponding feedback signal to the main control module through the detection output terminal according to the working status of the electrode module.

3. The power supply protection circuit of the electrolysis generating device according to claim 2, characterized in that: The overcurrent unit is a PTC thermistor.

4. The power supply protection circuit of the electrolysis generating device according to claim 2, characterized in that: The monitoring main unit includes a monitoring switch, and the monitoring switch outputs a corresponding feedback signal to the monitoring output end according to an input signal of the monitoring access end.

5. The power supply protection circuit of the electrolysis generating device according to claim 4, characterized in that: The monitoring switch is an NPN transistor, the base of the monitoring switch is connected to the monitoring input terminal through a shunt resistor, the collector of the monitoring switch is connected to the power supply through a first current limiting resistor; the collector of the monitoring switch is connected to the monitoring output terminal through a second current limiting resistor, and its emitter is grounded.

6. The power supply protection circuit of the electrolysis generating device according to claim 1, characterized in that: The switch control module includes a switch input end, a first switch and a second switch; the first switch is connected to the switch input end, and the second switch is configured on the power supply circuit; the main control module transmits a control signal to the first switch through the switch input end according to the feedback signal of the state monitoring module, controls the on-off of the first switch to control the on-off of the second switch, and controls the on-off of the power supply circuit by controlling the on-off of the second switch.

7. The power supply protection circuit of the electrolysis generating device according to claim 6, characterized in that: The first switch is an NPN transistor, and the second switch is a PMOS transistor; the base of the first switch is connected to the switch input terminal through a first protection resistor and a first protection diode; the collector of the first switch is connected to the gate of the second switch through a first current limiting resistor, and the emitter of the first switch is grounded; the drain and source of the second switch are connected to the power supply circuit.

8. The power supply protection circuit of the electrolysis generating device according to claim 1, characterized in that: It also includes an enable control module, which is connected to the main control module and the power supply circuit, and includes an enable input terminal; when the working state is a short circuit state, the main control module transmits an enable signal to the power supply circuit through the enable input terminal, so that the state monitoring module outputs a high level to the main control module.

9. The power supply protection circuit of the electrolysis generating device according to claim 8, characterized in that: The enable control module includes a first enable switch and a second enable switch; the first enable switch is an NPN transistor, the second enable switch is a PNP transistor, the base of the first enable switch is connected to the enable input terminal through a first enable resistor and an enable diode, the collector is connected to the base of the second enable switch through a second enable resistor, the emitter of the second enable switch is connected to the positive electrode of the power supply circuit, and the collector is connected to the positive electrode of the electrode module through a protective resistor; the emitter of the first enable switch is grounded.

10. A power supply protection method for an electrolytic generation device, characterized in that: The steps include: A power supply protection circuit for the electrolysis generation device as claimed in any one of claims 1 to 9 is arranged on the power supply circuit of the electrolysis generation device; Under normal conditions, the state monitoring module obtains the voltage signal of the electrode module and outputs a low level to the main control module; the main control module transmits a high level through the switch control module to control the power supply circuit to be turned on; In the short-circuit state, the state monitoring module obtains the voltage signal of the electrode module and outputs a high level to the main control module; the main control module transmits a low level through the switch control module to control the power supply circuit to be disconnected; In an overcurrent state, the state monitoring module increases the resistance of the power supply circuit to transmit current to the electrode module.

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