Electric furniture driver, electric bed and electric furniture

By adopting a relay drive circuit and a signal amplification circuit plus a resistor-capacitor phase shift circuit in the electric furniture drive, the problems of high cost and easy failure of the electric furniture drive in the prior art are solved, higher stability and safety are achieved, and the cost is reduced.

CN223348568UActive Publication Date: 2025-09-16LOCTEK ERGONOMIC TECH CORP
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Patent Information

Application Number
CN202422359084.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-26
Publication Date
2025-09-16
Estimated Expiration
2034-09-26

AI Technical Summary

Technical Problem

Existing electric furniture drivers generally use MOS half-bridge or full-bridge modes, which are costly and prone to failure, posing a personal safety hazard.

Method used

A relay drive circuit, a signal amplification circuit and a resistor-capacitor phase shift circuit are used to implement motor operation pulse processing and sampling, avoid MOS failure, improve circuit stability and accuracy, and reduce costs.

Benefits of technology

It improves the stability and safety of the circuit, avoids MOS failure, has lower cost, and has an accuracy similar to Hall technology, while reducing chip cost.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides an electric furniture driver, an electric bed and electric furniture, and relates to the technical field of furniture control, the electric furniture driver comprises a pulse acquisition circuit, the acquisition end of the pulse acquisition circuit is connected with the current acquisition end of a driving motor; the pulse acquisition end of the motor control circuit is connected with the pulse output end of the pulse acquisition circuit, and the control end of the motor control circuit is connected with the control end of the driving motor; the pulse acquisition circuit comprises a relay driving circuit which is connected with a current acquisition end of the driving motor; a current sampling end of the signal amplification circuit is connected with a current output end of the relay drive circuit, an amplification signal output end of the signal amplification circuit is connected with a signal input end of the resistance-capacitance phase shift circuit, and a pulse output end of the resistance-capacitance phase shift circuit is connected with a pulse acquisition end of the motor control circuit. The beneficial effects are that the circuit stability is improved, the cost is lower, and accurate motor control can be realized.
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Description

Technical Field

[0001] The utility model relates to the technical field of furniture control, in particular to an electric furniture driver, an electric bed and electric furniture. Background Art

[0002] Currently, electric furniture drivers on the market generally adopt MOS half-bridge or full-bridge modes, and there are also driver chip modes. In comparison, the cost is relatively high and it is prone to failure. When MOS fails, there may be personal safety issues. Utility Model Content

[0003] In view of the problems existing in the prior art, the utility model provides an electric furniture driver, comprising:

[0004] A pulse acquisition circuit, wherein the acquisition terminal of the pulse acquisition circuit is connected to the current acquisition terminal of the drive motor;

[0005] a motor control circuit, wherein a pulse collection terminal of the motor control circuit is connected to a pulse output terminal of the pulse collection circuit, and a control terminal of the motor control circuit is connected to a control terminal of the drive motor;

[0006] The pulse acquisition circuit comprises:

[0007] A relay drive circuit, wherein a collection terminal of the relay drive circuit is connected to a current collection terminal of the drive motor;

[0008] A signal amplification circuit, wherein the current sampling end of the signal amplification circuit is connected to the current output end of the relay drive circuit, the amplified signal output end of the signal amplification circuit is connected to the signal input end of the resistor-capacitor phase shift circuit, and the pulse output end of the resistor-capacitor phase shift circuit is connected to the pulse collection end of the motor control circuit.

[0009] Preferably, the current collection terminal of the driving motor includes a first collection terminal and a second collection terminal; the relay driving circuit includes:

[0010] a first relay, wherein a first end of a first relay double-throw switch corresponding to the first relay is connected to the first acquisition end of the drive motor, and a second end of the first relay double-throw switch is connected to a power supply;

[0011] a second relay, wherein a first end of a second relay double-throw switch corresponding to the second relay is connected to the second acquisition end of the drive motor, and a second end of the second relay double-throw switch is connected to a power supply;

[0012] The third end of the second relay double-throw switch is correspondingly connected to the third end of the first relay double-throw switch, and is also connected to the current sampling end of the signal amplifying circuit.

[0013] Preferably, the signal amplification circuit includes:

[0014] a first resistor, one end of the first resistor being connected to the current output end of the motor drive circuit and one end of a second resistor, and the other end of the first resistor being grounded;

[0015] A first operational amplifier, wherein the positive input terminal of the first operational amplifier is connected to the other end of the second resistor, the reverse input terminal of the first operational amplifier is connected to one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is grounded, the other end of the fourth resistor is connected to the output terminal of the first operational amplifier, and the output terminal of the first operational amplifier is connected to the signal input terminal of the RC phase shift circuit.

[0016] Preferably, the RC phase shift circuit includes:

[0017] a first capacitor, one end of the first capacitor being connected to the amplified signal output end of the signal amplifying circuit, the other end of the first capacitor being connected to one end of a fifth resistor and one end of a sixth resistor, the other end of the fifth resistor being connected to a power supply, and the other end of the sixth resistor being grounded;

[0018] a seventh resistor and an eighth resistor, one end of each of the seventh resistor and the eighth resistor being connected to the other end of the first capacitor, and the other end of each of the seventh resistor and the other end of each of the eighth resistor being connected to the positive input terminal and the negative input terminal of the second operational amplifier, respectively;

[0019] a second capacitor, one end of the second capacitor being connected to the other end of the seventh resistor, and the other end of the second capacitor being grounded;

[0020] a third capacitor, one end of the third capacitor being connected to the other end of the eighth resistor, and the other end of the third capacitor being grounded;

[0021] A ninth resistor, one end of the ninth resistor is connected to the output end of the second operational amplifier, and the other end of the ninth resistor is connected to the pulse collection end of the motor control circuit.

[0022] Preferably, the pulse acquisition circuit further includes a waveform shaping circuit, including:

[0023] a tenth resistor, one end of the tenth resistor being connected to the pulse output end of the RC phase shift circuit, and the other end of the tenth resistor being grounded;

[0024] A fourth capacitor, one end of the fourth capacitor is connected to the pulse output end of the RC phase shift circuit, and the other end of the fourth capacitor is grounded.

[0025] The present invention also provides an electric bed, comprising the electric furniture driver as described above. The present invention also provides an electric furniture, comprising the electric furniture driver as described above.

[0026] The above technical solution has the following advantages or beneficial effects:

[0027] 1. The drive circuit adopts relay drive, which improves the circuit stability, makes the product safer and more reliable, avoids MOS failure, and reduces the design cost;

[0028] 2. The signal amplification circuit plus the RC phase shift circuit is used to realize the motor operation pulse processing sampling, which can achieve precise motor control. The accuracy is on par with the commonly used Hall effect technology, and the cost is lower than the Hall effect technology solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of an electric furniture drive in a preferred embodiment of the present utility model;

[0030] Figure 2 This is a circuit diagram of a pulse acquisition circuit in a preferred embodiment of the present utility model. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment, and other embodiments may also fall within the scope of the present invention as long as they conform to the main purpose of the present invention.

[0032] In a preferred embodiment of the present invention, based on the above problems existing in the prior art, an electric furniture driver is provided. Figure 1 As shown, including:

[0033] Pulse acquisition circuit 1, the acquisition end of the pulse acquisition circuit is connected to the current acquisition end of the driving motor M;

[0034] The motor control circuit 2 has a pulse collection terminal connected to a pulse output terminal of the pulse collection circuit, and a control terminal of the motor control circuit connected to a control terminal of the driving motor M.

[0035] The pulse acquisition circuit 1 includes:

[0036] Relay drive circuit 11, the current collection terminal of the relay drive circuit connected to the drive motor M;

[0037] The signal amplifying circuit 12, the current sampling end of the signal amplifying circuit is connected to the current output end of the relay driving circuit, the amplified signal output end of the signal amplifying circuit is connected to the signal input end of the RC phase shift circuit, and the pulse output end of the RC phase shift circuit 13 is connected to the pulse collection end of the motor control circuit.

[0038] Specifically, in this embodiment, the driving circuit is driven by a relay, which improves the circuit stability. The relay-driven motor used is lower in cost than the H-bridge in traditional technology and does not have the problem of controlling the dead drive time, making the product safer and more reliable, avoiding MOS failure, and lowering the design cost; a signal amplification circuit plus a resistor-capacitor phase shift circuit is used to realize motor operation pulse processing sampling, amplify small signals, improve signal recognition rate and anti-interference ability, and realize precise motor control. The accuracy is on par with the commonly used Hall technology. The resistor-capacitor phase shift circuit does not require positive and negative power supply, which reduces the chip cost and makes signal processing simpler; the cost is lower than the Hall technology solution.

[0039] In a preferred embodiment of the present invention, Figure 2 As shown, the current collection terminal of the driving motor includes a first collection terminal and a second collection terminal; the relay driving circuit 11 includes:

[0040] A first relay T1, a first end of a first relay double-throw switch S1 corresponding to the first relay is connected to a first acquisition end of the drive motor M, and a second end of the first relay double-throw switch S2 is connected to a power supply VCC;

[0041] A second relay T2, a first end of a second relay double-throw switch S2 corresponding to the second relay is connected to the second acquisition end of the driving motor M, and a second end of the second relay double-throw switch S2 is connected to the power supply VCC;

[0042] The third end of the second relay double-throw switch S2 is correspondingly connected to the third end of the first relay double-throw switch S1 , and is also connected to the current sampling end of the signal amplifying circuit.

[0043] Specifically, in this embodiment, two relays are used to drive the motor. The working states of the two relays are synchronized. At each moment, only one relay double-throw switch turns on the power supply and drives the motor. Compared with the H-bridge, the cost is lower and there is no problem of controlling the dead drive time.

[0044] In a preferred embodiment of the present invention, Figure 2 As shown, the signal amplifying circuit 12 includes:

[0045] a first resistor R1, one end of the first resistor R1 being connected to the current output end of the motor drive circuit and one end of the second resistor R2, and the other end of the first resistor R1 being grounded;

[0046] A first operational amplifier U1, wherein the positive input terminal of the first operational amplifier U1 is connected to the other end of the second resistor R2, the reverse input terminal of the first operational amplifier U1 is connected to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the third resistor R3 is grounded, the other end of the fourth resistor R4 is connected to the output terminal of the first operational amplifier U1, and the output terminal of the first operational amplifier U1 is connected to the signal input terminal of the resistor-capacitor phase shift circuit.

[0047] Specifically, in this embodiment, the current of the motor is sampled through the first resistor R1, and the signal is amplified by the second resistor R2, the third resistor R3, the fourth resistor R4, and the first operational amplifier U1. The operational amplifier U1 amplifies the small signal, improves the signal recognition rate and anti-interference ability, and the subsequent signal processing has strong anti-interference ability and is easy to process.

[0048] In a preferred embodiment of the present invention, Figure 2 As shown, the RC phase shift circuit 13 includes:

[0049] a first capacitor C1, one end of the first capacitor C1 being connected to the amplified signal output end of the signal amplifying circuit, the other end of the first capacitor C1 being connected to one end of a fifth resistor R5 and one end of a sixth resistor R6, the other end of the fifth resistor R5 being connected to a power supply VDD, and the other end of the sixth resistor being grounded GND;

[0050] a seventh resistor R7 and an eighth resistor R8, one end of each of the seventh resistor R7 and the eighth resistor R8 being connected to the other end of the first capacitor C1, and the other end of each of the seventh resistor R7 and the other end of each of the eighth resistor R8 being connected to the positive input terminal and the negative input terminal of the second operational amplifier U2, respectively;

[0051] a second capacitor C2, one end of the second capacitor C2 being connected to the other end of the seventh resistor R7, and the other end of the second capacitor C2 being grounded;

[0052] a third capacitor C3, one end of the third capacitor C3 is connected to the other end of the eighth resistor R8, and the other end of the third capacitor C3 is grounded;

[0053] A ninth resistor R9, one end of the ninth resistor R9 is connected to the output end of the second operational amplifier U2, and the other end of the ninth resistor R9 is connected to the pulse collection end of the motor control circuit.

[0054] In a preferred embodiment of the present invention, the pulse acquisition circuit further includes a waveform shaping circuit 14, comprising:

[0055] a tenth resistor R10, one end of the tenth resistor R10 is connected to the pulse output end of the RC phase shift circuit, and the other end of the tenth resistor R10 is grounded;

[0056] A fourth capacitor C4 , one end of the fourth capacitor C4 is connected to the pulse output end of the RC phase shift circuit, and the other end of the fourth capacitor C4 is grounded.

[0057] Specifically, in this embodiment, after the signal amplification circuit performs signal amplification, the fifth resistor R5-the tenth resistor R10 and the first capacitor C1 to the third capacitor C3 are used to implement the motor operation pulse phase shift comparison processing, and the pulse interference in the circuit is absorbed by the waveform shaping circuit 14 and then output to the control chip in the motor control circuit 2 for processing to achieve precise motor control.

[0058] The utility model also provides an electric bed, comprising the electric furniture driver as described above.

[0059] The utility model also provides an electric furniture, comprising the electric furniture driver as described above.

[0060] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. An electric furniture driver, characterized in that: include: A pulse acquisition circuit, wherein the acquisition terminal of the pulse acquisition circuit is connected to the current acquisition terminal of the drive motor; a motor control circuit, wherein a pulse collection terminal of the motor control circuit is connected to a pulse output terminal of the pulse collection circuit, and a control terminal of the motor control circuit is connected to a control terminal of the drive motor; The pulse acquisition circuit comprises: A relay drive circuit, wherein a collection terminal of the relay drive circuit is connected to a current collection terminal of the drive motor; A signal amplification circuit, wherein the current sampling end of the signal amplification circuit is connected to the current output end of the relay drive circuit, the amplified signal output end of the signal amplification circuit is connected to the signal input end of the resistor-capacitor phase shift circuit, and the pulse output end of the resistor-capacitor phase shift circuit is connected to the pulse collection end of the motor control circuit.

2. The electric furniture drive according to claim 1, characterized in that The current collection terminal of the driving motor includes a first collection terminal and a second collection terminal; the relay driving circuit includes: a first relay, wherein a first end of a first relay double-throw switch corresponding to the first relay is connected to the first acquisition end of the drive motor, and a second end of the first relay double-throw switch is connected to a power supply; a second relay, wherein a first end of a second relay double-throw switch corresponding to the second relay is connected to the second acquisition end of the drive motor, and a second end of the second relay double-throw switch is connected to a power supply; The third end of the second relay double-throw switch is correspondingly connected to the third end of the first relay double-throw switch, and is also connected to the current sampling end of the signal amplifying circuit.

3. The electric furniture drive according to claim 1, characterized in that The signal amplifying circuit comprises: a first resistor, one end of the first resistor being connected to the current output end of the relay drive circuit and one end of a second resistor, and the other end of the first resistor being grounded; A first operational amplifier, wherein the positive input terminal of the first operational amplifier is connected to the other end of the second resistor, the reverse input terminal of the first operational amplifier is connected to one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is grounded, the other end of the fourth resistor is connected to the output terminal of the first operational amplifier, and the output terminal of the first operational amplifier is connected to the signal input terminal of the RC phase shift circuit.

4. The electric furniture drive according to claim 1, characterized in that The RC phase shift circuit comprises: a first capacitor, one end of the first capacitor being connected to the amplified signal output end of the signal amplifying circuit, the other end of the first capacitor being connected to one end of a fifth resistor and one end of a sixth resistor, the other end of the fifth resistor being connected to a power supply, and the other end of the sixth resistor being grounded; a seventh resistor and an eighth resistor, one end of each of the seventh resistor and the eighth resistor being connected to the other end of the first capacitor, and the other end of each of the seventh resistor and the other end of each of the eighth resistor being connected to the positive input terminal and the negative input terminal of the second operational amplifier, respectively; a second capacitor, one end of the second capacitor being connected to the other end of the seventh resistor, and the other end of the second capacitor being grounded; a third capacitor, one end of the third capacitor being connected to the other end of the eighth resistor, and the other end of the third capacitor being grounded; A ninth resistor, one end of the ninth resistor is connected to the output end of the second operational amplifier, and the other end of the ninth resistor is connected to the pulse collection end of the motor control circuit.

5. The electric furniture drive according to claim 1, characterized in that The pulse acquisition circuit also includes a waveform shaping circuit, including: a tenth resistor, one end of the tenth resistor being connected to the pulse output end of the RC phase shift circuit, and the other end of the tenth resistor being grounded; A fourth capacitor, one end of the fourth capacitor is connected to the pulse output end of the RC phase shift circuit, and the other end of the fourth capacitor is grounded.

6. An electric bed, characterized in that: The electric furniture drive comprises the electric furniture drive according to any one of claims 1 to 5.

7. An electric furniture, characterized in that: The electric furniture drive comprises the electric furniture drive according to any one of claims 1 to 5.