Electric heating table

Abstract

According to the electric heating table, the middle-layer electric heating device can be independently used as an emergency heating device and can also be used for normal heating at ordinary times, and it can be guaranteed that the total heating power is not higher than the rated power of a product. The electric heating table comprises table legs, a power supply control board, an operation panel and a power supply input end, table leg electric heating devices are arranged on the table legs, and when a detection circuit on the power supply control board detects that a middle-layer electric heating device and the table leg electric heating devices are turned on together, the table leg electric heating devices are turned on; the central processing unit of the power supply control board can reduce the power of the table leg electric heating device so that the total power of the electric heating table does not exceed the rated power, the middle layer heating device and the detection circuit have multiple connection modes, the detection circuit is electrically connected with the middle layer electric heating device, and the detection circuit is provided with a component for reducing the current intensity. According to the other connection mode, the detection circuit is divided into a connection circuit and an independent power supply circuit, and the two circuits are connected through an isolation optocoupler. The middle-layer electric heating device is detected through the detection circuit, then the power of the table leg electric heating device is regulated and controlled through the central processing unit, the two electric heating devices can be used at the same time, and the practicability of the equipment is improved.

Description

Technical Field

[0001] The utility model relates to an electric heating table. Background Art

[0002] At present, electric heating tables are equipped with electric heating devices, but the circuit board that controls the operation of the heating device is easily damaged. Therefore, a middle-layer electric heating device for emergency heating and an emergency switch that controls its on and off are also added to the electric heating table. Since the middle-layer electric heating device is usually not used at the same time as other electric heating devices, if the emergency switch is operated by mistake, the middle-layer electric heating device and other electric heating devices will work at the same time, which will exceed the rated power of the electric heating table. There are safety hazards in using these electric heating devices together for a long time. Utility Model Content

[0003] The purpose of the utility model is to provide an electric heating table with a middle-layer electric heating device which can be used alone as an emergency heating device and can also be used for normal heating, and can ensure that the total heating power is not higher than the rated power of the product.

[0004] An electric heating table comprises table legs, a power control board, an operation panel, and a power input terminal. The table legs are provided with table leg electric heating devices, the operation panel is electrically connected to the power control board, the table leg electric heating device is electrically connected to the power control board, and the power input terminal is electrically connected to the power control board.

[0005] The electric heating table also includes a middle-layer electric heating device, which is provided with a push-button switch, which controls the start and stop of the middle-layer electric heating device, and the middle-layer electric heating device is electrically connected to the power input terminal; the independent power supply can enable the middle-layer electric heating device to replace the table leg electric heating device for heating and heating when the table leg electric heating device cannot be started.

[0006] Furthermore, the power control board is provided with a detection circuit. After the key switch is closed, the detection circuit detects that the middle-layer electric heating device is activated. The detection circuit sends the detected signal of the middle-layer electric heating device being activated to the central processor of the power control board, and the central processor automatically calculates the total power of the current electric heating table. When the table foot electric heating device and the middle-layer electric heating device are started at the same time, the rated power will be exceeded. Through the calculation and regulation of the central processor, the power of the table foot electric heating device is reduced to ensure that the total power of the middle-layer electric heating device and the table foot electric heating device when used at the same time is not higher than the rated power of the electric heating table.

[0007] Furthermore, the middle-layer electric heating device is provided with a power regulating part, which includes a power regulating switch and a diode. The power regulating switch is connected in series with the push switch, and the diode is connected in parallel to the power regulating switch. When the power regulating switch is disconnected, the middle-layer electric heating device starts to heat with half the power. After the power regulating switch is closed, the middle-layer electric heating device starts to heat with full load power.

[0008] Furthermore, a connection method between the middle-layer electric heating device and the detection circuit is that the middle-layer electric heating device is electrically connected to the power input terminal, one end of the detection circuit is electrically connected to the middle-layer electric heating device, and the detection chip of the power circuit board is electrically connected to the detection circuit. The detection chip is used to detect whether the circuit of the middle-layer electric heating device is turned on. The detection circuit is provided with a resistor and a Zener diode circuit. The detection circuit includes 3 series resistors, and the total ohm is ≥300000Ω. The Zener diode circuit is connected in parallel to the first and second series resistors and before the third series resistor. A capacitor is also connected in parallel to the Zener diode circuit. One end of the capacitor is connected after the third series resistor. When the current passes through these components, the circuit current decreases so that it reaches the rated working current range of the detection chip.

[0009] Furthermore, another connection method between the middle-layer electric heating device and the detection circuit is that the middle-layer electric heating device is electrically connected to the power input terminal, the detection circuit includes a connecting circuit and an independent power supply circuit, one end of the connecting circuit is electrically connected to the middle-layer electric heating device, the independent power supply circuit is electrically connected to the detection chip of the power control board, and the connecting circuit and the independent power supply circuit are connected through an isolation optocoupler.

[0010] The isolation optocoupler includes a light emitting diode and a phototransistor. The connection circuit is connected in parallel with the middle-layer electric heating device, the connection circuit includes three series resistors and a diode, the total ohm number of the series resistors is ≥99000Ω, and the light emitting diode inside the isolation optocoupler is connected in parallel to the diode of the connection circuit.

[0011] The independent power supply circuit is independently powered by a 5 volt-ampere power supply and is grounded. A resistor and a phototransistor inside an isolation optical coupler are provided in the circuit.

[0012] The independent power supply circuit and the connecting circuit are connected through an isolating optocoupler. When the light-emitting diode on the connecting circuit inside the isolating optocoupler emits light, the phototransistor on the independent power supply circuit inside the isolating optocoupler receives the light signal, and the phototransistor turns on the circuit. After the circuit is turned on, current will flow through, and the detection chip connected to the detection circuit detects the current change and transmits the electrical signal to the central processing unit of the power control board.

[0013] The utility model reasonably regulates the power of the table leg electric heating device and the middle layer electric heating device so that the middle layer electric heating device can be turned on and used at the same time as the table leg electric heating device, and the middle layer electric heating device can also be used normally when the table leg electric heating device or the power circuit board fails, thereby improving the practicability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the circuit principle of Example 1.

[0015] Figure 2 A schematic diagram of the detection circuit implementation.

[0016] Figure 3 FIG. 2 is a schematic diagram of another implementation of the detection circuit.

[0017] Figure 4 Schematic diagram of the circuit principle of Example 2. DETAILED DESCRIPTION

[0018] Embodiment 1, combination Figure 1 to Figure 2 An electric heating table includes table legs, a power control board 9, an operation panel 8, a power input terminal 10, a middle-layer electric heating device 1, a table leg electric heating device 7 is provided on the table leg, the operation panel 8 is electrically connected to the power control board 9, the table leg electric heating device 7 is electrically connected to the power control board 9, and the power input terminal 10 is electrically connected to the power control board 9.

[0019] The middle-layer electric heating device 1 is electrically connected to the power input terminal 10 , and is provided with a key switch K2 , which controls the start and stop of the middle-layer electric heating device 1 , and the start and stop of the middle-layer electric heating device 1 are not affected by the operation panel 8 .

[0020] The power control board 9 is provided with a detection circuit 2 (the detection circuit itself belongs to the well-known technology and no special requirements are required). After the key switch K2 of the middle-layer electric heating device 1 is closed, the detection circuit 2 detects the start-up of the middle-layer electric heating device 1. The detection circuit 2 sends the detected start-up signal of the middle-layer electric heating device 1 to the central processing unit of the power control board 9. The central processing unit calculates the total power of the table leg electric heating device 7 and the middle-layer electric heating device 1 when they are running together. When the total power exceeds the rated power of the electric heating table, the power of the table leg electric heating device 7 can be reduced to ensure that the total power of the middle-layer electric heating device 1 and the table leg electric heating device 7 when used together is not higher than the rated power of the electric heating table (the central processing unit is usually called CPU, and the calculation function of the central processing unit and the function of reducing the power of the table leg electric heating device 7 are both existing technologies and will not be described in detail).

[0021] The middle-layer electric heating device 1 is electrically connected to the power input terminal 10, one end of the detection circuit 2 is electrically connected to the middle-layer electric heating device 1, a resistor and a Zener diode circuit 12 are provided on the detection circuit 2, and the detection circuit 2 includes 3 series resistors, whose total ohm is ≥300000Ω, the Zener diode circuit 12 is connected in parallel to the first and second series resistors and before the third series resistor, and a capacitor 102 is also connected in parallel to the Zener diode circuit 12, one end of the capacitor 102 is connected after the third series resistor, and the detection circuit 2 is electrically connected to the detection chip 3. When the current passes through these components, the circuit current becomes smaller so that it reaches within the rated working current range of the detection chip 3.

[0022] Combination Figure 3 , another detection circuit 2 is provided, and the working method of the detection circuit 2 is as follows: the middle-layer electric heating device 1 is electrically connected to the power input terminal 10, the detection circuit 2 includes a connecting circuit 5, an independent power supply circuit 6 and an isolation optocoupler 11 connecting the two circuits, the connecting circuit 5 includes three series resistors and a diode, the total ohm value of the series resistors is ≥99000Ω, and the light-emitting diode 5-1 inside the isolation optocoupler 11 is connected in parallel to the diode of the connecting circuit 5.

[0023] The isolation optocoupler comprises a light emitting diode 5-1 and a phototransistor 6-1. The independent power supply circuit 6 is independently powered by an external power supply 6-2 and the circuit is grounded. A resistor and the phototransistor 6-1 inside the isolation optocoupler 11 are provided in the circuit.

[0024] The connecting circuit 5 and the independent power supply circuit 6 are connected through the isolating optocoupler 11. When the push switch K2 is closed and the middle-layer electric heating device loop is turned on, the current passes through the light-emitting diode on the connecting circuit 5 inside the isolating optocoupler 11, and the light-emitting diode 5-1 emits a light signal. The phototransistor 6-1 on the independent power supply circuit 6 inside the isolating optocoupler 11 receives the light signal and turns on the independent power supply circuit 6. After the circuit is turned on, current will flow, so that the detection chip 3 detects the current change and transmits the electrical signal to the central processing unit of the power control board.

[0025] Embodiment 2, combined Figure 4 The difference between Example 2 and Example 1 is that the middle-layer electric heating device 1 is also provided with a power regulating part, which includes a power regulating switch K3 and a diode D1. The power regulating part is connected in parallel between the middle-layer electric heating device 1 and the key switch K2. When the power regulating switch K3 is disconnected, the middle-layer electric heating device 1 can be controlled to start heating with half the power. When the power regulating switch K3 is closed, the middle-layer electric heating device 1 can be controlled to start heating with full load power.

Claims

1. An electric heating table, comprising a table leg, a power control board, an operation panel, and a power input terminal, wherein the table leg is provided with a table leg electric heating device, the operation panel is electrically connected to the power control board, the table leg electric heating device is electrically connected to the power control board, and the power input terminal is electrically connected to the power control board; The middle-layer electric heating device is also included. The middle-layer electric heating device is provided with a key switch. The key switch controls the start and stop of the middle-layer electric heating device. The middle-layer electric heating device is electrically connected to the power input terminal. It is characterized in that The power control board is provided with a detection circuit. After the key switch is closed, the detection circuit detects that the middle-layer electric heating device starts to generate heat. The detection circuit sends the signal that the middle-layer electric heating device starts to generate heat to the central processor of the power control board. The central processor calculates the total power of the table leg electric heating device and the middle-layer electric heating device, and can ensure that the total power of the middle-layer electric heating device and the table leg electric heating device when used at the same time is not higher than the rated power of the electric heating table by reducing the power of the table leg electric heating device.

2. The electric heating table according to claim 1, characterized in that: The middle-layer electric heating device is provided with a power regulating part, which includes a power regulating switch and a diode. The power regulating part is connected in parallel between the middle-layer electric heating device and the key switch.

3. The electric heating table according to claim 1, characterized in that: The detection circuit includes a plurality of resistors and a Zener diode circuit. One end of the detection circuit is electrically connected to the middle-layer electric heating device, and the other end of the detection circuit is electrically connected to the detection chip of the power control board.

4. The electric heating table according to claim 1, characterized in that: The detection circuit includes a connection circuit and an independent power supply circuit. One end of the connection circuit is electrically connected to the middle-layer electric heating device, and the independent power supply circuit is electrically connected to the detection chip of the power control board. The connection circuit and the independent power supply circuit are connected through an isolation optical coupler.

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