A high-voltage direct-current fan control circuit for a gas water heater

Abstract

The utility model discloses a kind of high-voltage direct-current fan control circuits of gas water heater, including main control board and drive board, the main control board includes main power module, main control module and isolation communication module, drive board includes auxiliary power module, vice control module, fan port and three-phase inverter module, vice control module and three-phase inverter module are matched and the high-voltage direct-current electricity output by main power module is converted into three-phase alternating current, and high-voltage brushless direct-current motor connected with motor port is powered, for this auxiliary power module only needs to be configured as the circuit of vice control module and three-phase inverter module power supply, without additional voltage conversion circuit for motor configuration, reduce development and production cost, and avoid low-voltage direct-current brushless fan in running process Energy transmission loss is larger, improve the overall energy efficiency of device.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and more specifically to a high-voltage DC fan control circuit for gas water heaters. Background Technology

[0002] Gas water heaters are the most common choice for hot water installation in households. They are equipped with a fan that provides oxygen for combustion, exhausts combustion gases, and resists external wind pressure to prevent backflow of flue gas, ensuring efficient and safe operation of the water heater.

[0003] Traditional gas water heaters are equipped with low-voltage DC brushless fans. Because they use low-voltage power supply, they cannot be directly driven by mains power. In practical applications, an additional voltage conversion circuit is required, which increases development and production costs to some extent. In addition, low-voltage DC brushless fans have large energy transmission losses during operation, resulting in poor overall energy efficiency. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a high-voltage DC fan control circuit for gas water heaters.

[0005] The technical solution adopted by this utility model to solve the problem is: A high-voltage DC fan control circuit for a gas water heater includes a main control board and a drive board; The main control board includes a main power module, a main control module, and an isolated communication module. The main power module is connected to both the main control module and the isolated communication module. The main control module is connected to the isolated communication module. The drive board includes an auxiliary power supply module, an auxiliary control module, a fan port, and a three-phase inverter module. The auxiliary power supply module is connected to both the auxiliary control module and the three-phase inverter module. The auxiliary control module is connected to the three-phase inverter module, and the three-phase inverter module is connected to the fan port. The main power module is connected to the three-phase inverter module; The main power module is connected to the auxiliary power module; The main control module communicates with the secondary control module through the isolation communication module.

[0006] As a further improvement to the above technical solution, the isolated communication module includes optocoupler U1, optocoupler U2, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, capacitor C1 and capacitor C2. The main control module is configured with a first connection terminal and a second connection terminal, and the secondary control module is configured with a first connection terminal and a second connection terminal. The first connection terminal of the main control module is connected to the collector of the optocoupler U1 through the resistor R1. The first connection terminal of the main control module is connected to the ground through the capacitor C1. The collector of the optocoupler U1 is connected to the main power supply module through the resistor R2. The emitter of the optocoupler U1 is connected to the ground. The anode of the optocoupler U1 is connected to the auxiliary power supply module through the resistor R3. The cathode of the optocoupler U1 is connected to the first connection terminal of the auxiliary control module. The second connection terminal of the main control module is connected to the cathode of the optocoupler U2. The anode of the optocoupler U2 is connected to the main power supply module through the resistor R4. The emitter of the optocoupler U2 is connected to ground. The collector of the optocoupler U2 is connected to the auxiliary power supply module through the resistor R6. The collector of the optocoupler U2 is connected to the second connection terminal of the auxiliary control module through the resistor R5. The second connection terminal of the auxiliary control module is connected to ground through the capacitor C2.

[0007] As a further improvement to the above technical solution, the main power module includes an AC power input terminal and a rectifier and filter unit, wherein the AC power input terminal is connected to the rectifier and filter unit. The three-phase inverter module includes three single-phase intelligent power units. The auxiliary control module is connected to each of the single-phase intelligent power units. The rectifier and filter unit is connected to each of the single-phase intelligent power units. Each of the single-phase intelligent power units is connected to the fan port.

[0008] As a further improvement to the above technical solution, the single-phase intelligent power unit includes a power chip of model LKS1D5003D, resistors R7 and R8, capacitors C3, C4, C5 and C6. The power chip is configured with a high-side power supply terminal, a low-side power supply terminal, a ground terminal, a high-side input terminal, a low-side input terminal, a DC voltage input terminal, an output terminal and a reference terminal. The secondary control module is configured with a third connection terminal and a fourth connection terminal. The low-side power supply terminal (pin 3) of the power chip is connected to the auxiliary power supply module. The ground terminal (pins 4 and 5) of the power chip is connected to ground. The third connection terminal of the auxiliary control module is connected to the high-side input terminal (pin 6) of the power chip through resistor R7. The high-side input terminal of the power chip is connected to ground through capacitor C3. The fourth connection terminal of the auxiliary control module is connected to the low-side input terminal (pin 7) of the power chip through resistor R8. The low-side input terminal of the power chip is connected to ground through capacitor C4. The reference terminal (pins 8 and 9) of the power chip is connected to ground through capacitor C5. The output terminal (pins 10, 11, and 14) of the power chip is connected to the fan port. The high-side power supply terminal (pin 1) of the power chip is connected to its output terminal through capacitor C6. The DC voltage input terminal (pins 12, 13, and 15) of the power chip is connected to the rectifier and filter unit.

[0009] As a further improvement to the above technical solution, the three-phase inverter module also includes resistor R9, resistor R10, capacitor C7 and diode D1, and the sub-control module is configured with a fifth connection terminal; The DC voltage input terminal of the power chip is connected to ground through resistor R9 and resistor R10. The positive terminal of diode D1 is connected to the connection point of resistor R9 and resistor R10. The negative terminal of diode D1 is connected to the auxiliary power supply module. The positive terminal of diode D1 is connected to ground through capacitor C7. The positive terminal of diode D1 is connected to the fifth connection terminal of the auxiliary control module.

[0010] As a further improvement to the above technical solution, the drive board also includes a back EMF detection module, which is connected to the fan port, and the secondary control module is connected to the back EMF detection module.

[0011] As a further improvement to the above technical solution, the back EMF detection module includes three detection units, each of which includes resistors R11, R12, and R13, capacitor C8, and capacitor C9. The sub-control module is equipped with a sixth connection terminal and a seventh connection terminal. One end of resistor R11 is connected to ground through capacitor C8, and the other end of resistor R11 is connected to the sixth connection terminal of the sub-control module. The seventh connection terminal of the sub-control module is connected to the connection point of resistor R11 and capacitor C8. One end of resistor R12 is connected to the fan port, and the other end of resistor R12 is connected to ground through resistor R13. Capacitor C8 is connected in parallel with resistor R13. One end of capacitor C9 is connected to the connection point of resistor R12 and fan port, and the other end of capacitor C9 is connected to ground.

[0012] As a further improvement to the above technical solution, the drive board also includes an overheat protection module, the auxiliary power supply module is connected to the overheat protection module, and the auxiliary control module is connected to the overheat protection module.

[0013] As a further improvement to the above technical solution, the overheat protection module includes a thermistor RT, a resistor R14, a resistor R15 and a capacitor C10, and the sub-control module is configured with an eighth connection terminal. One end of resistor R14 is connected to the auxiliary power supply module, and the other end of resistor R14 is connected to ground through the thermistor RT. One end of resistor R15 is connected to the connection point of resistor R14 and the thermistor RT, and the other end of resistor R15 is connected to the eighth connection terminal of the auxiliary control module. The eighth connection terminal of the auxiliary control module is connected to ground through the capacitor C10.

[0014] The beneficial effects of this utility model are as follows: This technical solution includes a main control board and a drive board, wherein the drive board includes an auxiliary power supply module, an auxiliary control module, a fan port, and a three-phase inverter module. The auxiliary control module and the three-phase inverter module cooperate to convert the high-voltage DC power output by the main power supply module into three-phase AC power to power the high-voltage brushless DC motor connected to the motor port. Therefore, the auxiliary power supply module only needs to be configured with a circuit to power the auxiliary control module and the three-phase inverter module, without the need to configure an additional voltage conversion circuit for the motor, thereby reducing development and production costs and avoiding large energy transmission losses during the operation of the low-voltage DC brushless fan, thus improving the overall energy efficiency of the device. Attached Figure Description

[0015] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a circuit module framework diagram of this utility model; Figure 2 This is the circuit schematic diagram of the isolation communication module in this utility model; Figure 3 This is the circuit schematic diagram of the three-phase inverter module in this utility model; Figure 4 This is the circuit diagram of the back electromotive force detection module in this utility model; Figure 5 This is the circuit diagram of the overheat protection module in this utility model. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the description of the textual part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] Reference Figures 1 to 5 This application discloses a high-voltage DC fan control circuit for a gas water heater. Its first embodiment includes a main control board and a drive board. The main control board includes a main power module, a main control module, and an isolated communication module. The main power module is connected to the main control module and the isolated communication module respectively. The main control module is connected to the isolated communication module. The main power module is used to convert 220V AC to high voltage DC, and then convert the high voltage DC to multiple low voltage DC such as 27V, 18V, 15V and 5V. The drive board includes an auxiliary power supply module, an auxiliary control module, a fan port, and a three-phase inverter module. The auxiliary power supply module is connected to both the auxiliary control module and the three-phase inverter module. The auxiliary control module is connected to the three-phase inverter module. The three-phase inverter module is connected to the fan port. The auxiliary voltage module can be a power supply port connected to the main power supply module, or it can be used to convert low-voltage DC power such as 27V, 18V, and 15V into other DC power with even lower amplitude (such as 5V). The fan port is used to connect to an external high-voltage DC brushless fan. The main power module is connected to the three-phase inverter module; The main power module is connected to the auxiliary power module; The main control module communicates with the secondary control module through the isolation communication module.

[0022] Specifically, in this embodiment, the entire control circuit is divided into a main control board and a drive board. The drive board includes an auxiliary power supply module, an auxiliary control module, a fan port, and a three-phase inverter module. The auxiliary control module and the three-phase inverter module work together to convert the high-voltage DC power output from the main power supply module into three-phase AC power to power the high-voltage brushless DC motor connected to the motor port. Therefore, the auxiliary power supply module only needs to be configured with a circuit to power the auxiliary control module and the three-phase inverter module, without the need to configure an additional voltage conversion circuit for the motor, which reduces development and production costs and avoids large energy transmission losses during the operation of the low-voltage DC brushless fan, thus improving the overall energy efficiency of the device.

[0023] As a further preferred embodiment, in this embodiment, the isolated communication module includes optocoupler U1, optocoupler U2, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, capacitor C1, and capacitor C2. The main control module is configured with a first connection terminal and a second connection terminal, and the secondary control module is configured with a first connection terminal and a second connection terminal. The first connection terminal of the main control module is connected to the collector of the optocoupler U1 through the resistor R1. The first connection terminal of the main control module is connected to the ground through the capacitor C1. The collector of the optocoupler U1 is connected to the main power supply module through the resistor R2. The emitter of the optocoupler U1 is connected to the ground. The anode of the optocoupler U1 is connected to the auxiliary power supply module through the resistor R3. The cathode of the optocoupler U1 is connected to the first connection terminal of the auxiliary control module. The second connection terminal of the main control module is connected to the cathode of the optocoupler U2. The anode of the optocoupler U2 is connected to the main power supply module through the resistor R4. The emitter of the optocoupler U2 is connected to ground. The collector of the optocoupler U2 is connected to the auxiliary power supply module through the resistor R6. The collector of the optocoupler U2 is connected to the second connection terminal of the auxiliary control module through the resistor R5. The second connection terminal of the auxiliary control module is connected to ground through the capacitor C2.

[0024] As a further preferred embodiment, in this embodiment, the main power module includes an AC power input terminal and a rectifier and filter unit, wherein the AC power input terminal is connected to the rectifier and filter unit; The three-phase inverter module includes three single-phase intelligent power units. The auxiliary control module is connected to each of the single-phase intelligent power units. The rectifier and filter unit is connected to each of the single-phase intelligent power units. The fan port is configured with three connection terminals, and each of the single-phase intelligent power units is connected to each connection terminal of the fan port in a one-to-one correspondence.

[0025] Specifically, in this embodiment, the single-phase intelligent power unit includes a power chip of model LKS1D5003D, resistors R7 and R8, capacitors C3, C4, C5, and C6. The power chip is configured with a high-side power supply terminal, a low-side power supply terminal, a ground terminal, a high-side input terminal, a low-side input terminal, a DC voltage input terminal, an output terminal, and a reference terminal. The sub-control module is configured with a third connection terminal and a fourth connection terminal, and the sub-control module has three third connection terminals and three fourth connection terminals. The low-side power supply terminal (pin 3) of the power chip is connected to the auxiliary power supply module. The ground terminal (pins 4 and 5) of the power chip is connected to ground. The third connection terminal of the auxiliary control module is connected to the high-side input terminal (pin 6) of the power chip through resistor R7. The high-side input terminal of the power chip is connected to ground through capacitor C3. The fourth connection terminal of the auxiliary control module is connected to the low-side input terminal (pin 7) of the power chip through resistor R8. The low-side input terminal of the power chip is connected to ground through capacitor C4. The reference terminal (pins 8 and 9) of the power chip is connected to... The capacitor C5 is connected to ground. The output terminal (pins 10, 11, and 14) of the power chip is connected to the fan port. The high-side power supply terminal (pin 1) of the power chip is connected to its output terminal through the capacitor C6. The DC voltage input terminal (pins 12, 13, and 15) of the power chip is connected to the rectifier and filter unit. Each third connection terminal of the sub-control module corresponds one-to-one with the high-side input terminal of the power chip in each single-phase intelligent power unit. Each fourth connection terminal of the sub-control module corresponds one-to-one with the low-side input terminal of the power chip in each single-phase intelligent power unit.

[0026] As a further preferred embodiment, in this embodiment, the three-phase inverter module further includes resistor R9, resistor R10, capacitor C7 and diode D1, and the sub-control module is configured with a fifth connection terminal; The DC voltage input terminal of the power chip is connected to ground through resistor R9 and resistor R10. The positive terminal of diode D1 is connected to the connection point of resistor R9 and resistor R10. The negative terminal of diode D1 is connected to the auxiliary power supply module. The positive terminal of diode D1 is connected to ground through capacitor C7. The positive terminal of diode D1 is connected to the fifth connection terminal of the auxiliary control module.

[0027] As a further preferred embodiment, in this embodiment, the drive board further includes a back EMF detection module, which is connected to the fan port, and the secondary control module is connected to the back EMF detection module.

[0028] Specifically, in this embodiment, the back EMF detection module includes three detection units, each including resistor R11, resistor R12, resistor R13, capacitor C8, and capacitor C9. The sub-control module is configured with a sixth connection terminal and a seventh connection terminal, and the seventh connection terminal of the sub-control module is configured with three terminals. One end of resistor R11 is connected to ground through capacitor C8, and the other end of resistor R11 is connected to the sixth connection terminal of the sub-control module. The seventh connection terminal of the sub-control module is connected to the connection point of resistor R11 and capacitor C8. One end of resistor R12 is connected to the fan port, and the other end of resistor R12 is connected to ground through resistor R13. Capacitor C8 is connected in parallel with resistor R13. One end of capacitor C9 is connected to the connection point of resistor R12 and fan port, and the other end of capacitor C9 is connected to ground. Each seventh connection terminal of the sub-control module corresponds to each of the detection units, and each end of resistor R12 in each detection unit corresponds to each connection terminal of the fan port.

[0029] As a further preferred embodiment, in this embodiment, the drive board further includes an overheat protection module, the auxiliary power supply module is connected to the overheat protection module, and the auxiliary control module is connected to the overheat protection module.

[0030] Specifically, in this embodiment, the overheat protection module includes a thermistor RT, a resistor R14, a resistor R15, and a capacitor C10, and the sub-control module is configured with an eighth connection terminal. One end of resistor R14 is connected to the auxiliary power supply module, and the other end of resistor R14 is connected to ground through the thermistor RT. One end of resistor R15 is connected to the connection point of resistor R14 and the thermistor RT, and the other end of resistor R15 is connected to the eighth connection terminal of the auxiliary control module. The eighth connection terminal of the auxiliary control module is connected to ground through the capacitor C10.

[0031] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A high-voltage DC fan control circuit for a gas water heater, characterized in that: Including the main control board and the driver board; The main control board includes a main power module, a main control module, and an isolated communication module. The main power module is connected to both the main control module and the isolated communication module. The main control module is connected to the isolated communication module. The drive board includes an auxiliary power supply module, an auxiliary control module, a fan port, and a three-phase inverter module. The auxiliary power supply module is connected to both the auxiliary control module and the three-phase inverter module. The auxiliary control module is connected to the three-phase inverter module, and the three-phase inverter module is connected to the fan port. The main power module is connected to the three-phase inverter module; The main power module is connected to the auxiliary power module; The main control module communicates with the secondary control module through the isolation communication module.

2. The high-voltage DC fan control circuit for a gas water heater according to claim 1, characterized in that: The isolated communication module includes optocoupler U1, optocoupler U2, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, capacitor C1, and capacitor C2. The main control module is configured with a first connection terminal and a second connection terminal, and the secondary control module is configured with a first connection terminal and a second connection terminal. The first connection terminal of the main control module is connected to the collector of the optocoupler U1 through the resistor R1. The first connection terminal of the main control module is connected to the ground through the capacitor C1. The collector of the optocoupler U1 is connected to the main power supply module through the resistor R2. The emitter of the optocoupler U1 is connected to the ground. The anode of the optocoupler U1 is connected to the auxiliary power supply module through the resistor R3. The cathode of the optocoupler U1 is connected to the first connection terminal of the auxiliary control module. The second connection terminal of the main control module is connected to the cathode of the optocoupler U2. The anode of the optocoupler U2 is connected to the main power supply module through the resistor R4. The emitter of the optocoupler U2 is connected to ground. The collector of the optocoupler U2 is connected to the auxiliary power supply module through the resistor R6. The collector of the optocoupler U2 is connected to the second connection terminal of the auxiliary control module through the resistor R5. The second connection terminal of the auxiliary control module is connected to ground through the capacitor C2.

3. The high-voltage DC fan control circuit for a gas water heater according to claim 1, characterized in that: The main power module includes an AC power input terminal and a rectifier and filter unit, wherein the AC power input terminal is connected to the rectifier and filter unit; The three-phase inverter module includes three single-phase intelligent power units. The auxiliary control module is connected to each of the single-phase intelligent power units. The rectifier and filter unit is connected to each of the single-phase intelligent power units. Each of the single-phase intelligent power units is connected to the fan port.

4. The high-voltage DC fan control circuit for a gas water heater according to claim 3, characterized in that: The single-phase intelligent power unit includes a power chip of model LKS1D5003D, resistors R7 and R8, capacitors C3, C4, C5, and C6. The power chip is configured with a high-side power supply terminal, a low-side power supply terminal, a ground terminal, a high-side input terminal, a low-side input terminal, a DC voltage input terminal, an output terminal, and a reference terminal. The sub-control module is configured with a third connection terminal and a fourth connection terminal. The low-side power supply terminal of the power chip is connected to the auxiliary power supply module, the ground terminal of the power chip is connected to ground, the third connection terminal of the auxiliary control module is connected to the high-side input terminal of the power chip through the resistor R7, the high-side input terminal of the power chip is connected to ground through the capacitor C3, the fourth connection terminal of the auxiliary control module is connected to the low-side input terminal of the power chip through the resistor R8, the low-side input terminal of the power chip is connected to ground through the capacitor C4, the reference terminal of the power chip is connected to ground through the capacitor C5, the output terminal of the power chip is connected to the fan port, the high-side power supply terminal of the power chip is connected to its output terminal through the capacitor C6, and the DC voltage input terminal of the power chip is connected to the rectifier and filter unit.

5. The high-voltage DC fan control circuit for a gas water heater according to claim 4, characterized in that: The three-phase inverter module also includes resistor R9, resistor R10, capacitor C7 and diode D1, and the sub-control module is equipped with a fifth connection terminal; The DC voltage input terminal of the power chip is connected to ground through resistor R9 and resistor R10. The positive terminal of diode D1 is connected to the connection point of resistor R9 and resistor R10. The negative terminal of diode D1 is connected to the auxiliary power supply module. The positive terminal of diode D1 is connected to ground through capacitor C7. The positive terminal of diode D1 is connected to the fifth connection terminal of the auxiliary control module.

6. The high-voltage DC fan control circuit for a gas water heater according to claim 1, characterized in that: The drive board also includes a back EMF detection module, which is connected to the fan port, and the secondary control module is connected to the back EMF detection module.

7. The high-voltage DC fan control circuit for a gas water heater according to claim 6, characterized in that: The back EMF detection module includes three detection units, each including resistor R11, resistor R12, resistor R13, capacitor C8, and capacitor C9. The sub-control module is equipped with a sixth connection terminal and a seventh connection terminal. One end of resistor R11 is connected to ground through capacitor C8, and the other end of resistor R11 is connected to the sixth connection terminal of the sub-control module. The seventh connection terminal of the sub-control module is connected to the connection point of resistor R11 and capacitor C8. One end of resistor R12 is connected to the fan port, and the other end of resistor R12 is connected to ground through resistor R13. Capacitor C8 is connected in parallel with resistor R13. One end of capacitor C9 is connected to the connection point of resistor R12 and fan port, and the other end of capacitor C9 is connected to ground.

8. The high-voltage DC fan control circuit for a gas water heater according to claim 1, characterized in that: The drive board also includes an overheat protection module, the auxiliary power supply module is connected to the overheat protection module, and the auxiliary control module is connected to the overheat protection module.

9. The high-voltage DC fan control circuit for a gas water heater according to claim 8, characterized in that: The overheat protection module includes a thermistor RT, a resistor R14, a resistor R15, and a capacitor C10. The sub-control module is equipped with an eighth connection terminal. One end of resistor R14 is connected to the auxiliary power supply module, and the other end of resistor R14 is connected to ground through the thermistor RT. One end of resistor R15 is connected to the connection point of resistor R14 and the thermistor RT, and the other end of resistor R15 is connected to the eighth connection terminal of the auxiliary control module. The eighth connection terminal of the auxiliary control module is connected to ground through the capacitor C10.

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