Power supply module suitable for multi-turn encoder

Abstract

The utility model discloses a power supply module suitable for a multi-turn encoder, which comprises a super capacitor charging and discharging circuit and a power supply circuit, and the super capacitor charging and discharging circuit is connected with the power supply circuit, so that the power supply circuit can charge a super capacitor while supplying power to the power supply circuit required by the multi-turn encoder. The problem that position data stored in the multi-turn encoder is lost under the condition that a system power supply and an external power supply are powered down is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a power supply module suitable for a multi-turn encoder. Background Art

[0002] A single-turn absolute encoder can measure the absolute angle position of a motor shaft end or a reducer end after one rotation (0-360°), but if the measured angle value is greater than 360°, a multi-turn absolute encoder is required. At present, there are three methods to implement multi-turn encoders: gear type, sensor type, and energy harvesting technology. The gear type uses gears of different sizes and numbers of teeth for mechanical measurement, and even if the system loses power, the multi-turn data will not be lost. The sensor type measures multi-turn data through principles such as light and magnetism. The disadvantage is that once the system loses power, the multi-turn data will be lost, so a backup power supply is required. The energy harvesting technology method uses a coil to cut the magnetic field to generate current to perform multi-turn position measurement, without the need for power supply. Because the sensor type is simpler in structure and smaller in size than the gear type, and has more cost advantages than the Wiegand, most multi-turn absolute encoders are implemented using a sensor solution, but the disadvantage is that a backup battery is required.

[0003] At present, button batteries are often used as backup batteries for multi-turn encoders. With the low-power mode, the battery life can be 1-3 years. The data changes of the number of turns can be recorded during the battery life. As the integration of products becomes higher and higher, the structural dimensions of multi-turn encoders are getting smaller and smaller. Conventional battery bodies and matching battery holders will occupy a lot of PCB space, so most batteries are installed in an external form, including the need to disassemble and assemble the encoder when replacing the battery later, which reduces maintenance costs. Therefore, this leads to the need to attach battery modules for assembly and circulation in the production process, especially after the encoder is calibrated. In this process, once the battery interface is loose or falls off, the position data will be lost, and the production process will have to be reworked, which not only increases the workload but also affects the output. In addition, the external battery interface makes the product less reliable. The vibration of the equipment operation and the harsh operating environment will cause poor contact of the interface, resulting in power failure of the backup power supply and loss of position data.

[0004] At the product user end, once the battery is low, the system will remind the customer to replace the battery. At this time, if the entire system is powered off before replacement, the replacement process will cause the encoder to lose power and the position data will be lost. If the backup battery is replaced without the system losing power, there will be certain electrical safety hazards and the risk of personal injury due to malfunction of the equipment. Utility Model Content

[0005] The purpose of the present utility model is to provide a power supply module suitable for a multi-turn encoder in order to solve the above-mentioned problem, as described below.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model provides a power supply module suitable for a multi-turn encoder, the power supply module comprising a supercapacitor charging and discharging circuit and a power supply circuit, the supercapacitor charging and discharging circuit is connected to the power supply circuit so that the power supply circuit can charge the supercapacitor while supplying power to the power supply circuit required by the multi-turn encoder.

[0008] It is understandable that the traditional sensor-type multi-turn encoder usually uses an external power supply or a system power supply circuit to power the multi-turn encoder. When the external power supply circuit or the system power supply circuit loses power, it will cause the power supply circuit required by the multi-turn encoder to lose power, causing the position data stored in the multi-turn encoder to be lost. In the embodiment of the present application, the power supply module includes a supercapacitor charging and discharging circuit and a power supply circuit. The supercapacitor charging and discharging circuit is connected to the power supply circuit so that the power supply circuit can charge the supercapacitor while supplying power to the power supply circuit required by the multi-turn encoder. Even if no additional backup power supply is installed at this time, the supercapacitor charging and discharging circuit can be used as the power supply circuit required by the multi-turn encoder to prevent the position data stored in the multi-turn encoder from being lost when the power supply circuit loses power, thereby improving production efficiency.

[0009] Preferably, the power supply circuit includes an external power supply circuit; the supercapacitor charging and discharging circuit and the external power supply circuit are connected in series via a first diode so that the external power supply circuit charges the supercapacitor in the supercapacitor charging and discharging circuit.

[0010] Preferably, the power supply circuit includes a system power supply circuit; the supercapacitor charging and discharging circuit is connected in series with the system power supply circuit, and then connected in parallel with the external power supply circuit through a second diode, so that the system power supply circuit charges the supercapacitor.

[0011] Preferably, the power supply module further includes a current limiting circuit, and the current limiting circuit is connected to the supercapacitor charging and discharging circuit.

[0012] Preferably, the current limiting circuit comprises a first resistor, a second resistor and a first transistor, wherein the first resistor is connected in parallel with the second resistor, and the second resistor is connected in series with the first transistor.

[0013] Preferably, the current limiting circuit comprises a third resistor.

[0014] Preferably, the external power supply circuit is electrically connected to the first voltage converter; and the system power supply circuit is electrically connected to the second voltage converter.

[0015] Preferably, the external power supply circuit is also connected to a battery power detection circuit, and the battery power detection circuit is used to detect the power of the external power supply based on a detection signal sent by the system controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the series structure of a supercapacitor and an external power supply suitable for a power supply module of a multi-turn encoder in the utility model;

[0018] Figure 2 This is a schematic diagram of the parallel structure of the supercapacitor and the external power supply of the power supply module suitable for the multi-turn encoder in the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of a power supply module in which a supercapacitor and an external power supply are connected in series in another embodiment of the application;

[0020] Figure 4 This is a schematic diagram of the structure of a power supply module in which a supercapacitor and an external power supply are connected in parallel in another embodiment of the application;

[0021] Figure 5 It is a schematic diagram of the power supply module structure in which a supercapacitor and an external power supply are connected in parallel in other application embodiments. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0023] See also Figure 1-Figure 5As shown, the utility model provides a power supply module suitable for a multi-turn encoder, including a supercapacitor charging and discharging circuit and a power supply circuit; the supercapacitor charging and discharging circuit is connected to the power supply circuit through a diode, so that the power supply circuit can charge the supercapacitor while supplying power to the power supply circuit required by the multi-turn encoder; wherein the power supply circuit can be an external power supply circuit or a system power supply circuit, or the external power supply circuit and the system power supply circuit can simultaneously supply power to the power supply circuit required by the multi-turn encoder.

[0024] See also Figure 1 As shown, the power supply circuit includes an external power supply circuit and a system power supply circuit; when the supercapacitor charging and discharging circuit is connected in series with the external power supply circuit through the first diode and connected in parallel with the system power supply circuit through the second diode and the external power supply is not powered off, the external power supply supplies power to the power supply circuit required by the multi-turn encoder while also charging the supercapacitor; when the external power supply needs to be replaced, the electricity stored in the supercapacitor can continue to temporarily supply power to the power supply circuit required by the multi-turn encoder, and after the external power supply is replaced, the external power supply is still used to supply power to the power supply circuit required by the multi-turn encoder.

[0025] See also Figure 2 As shown, the power supply circuit includes an external power supply circuit and a system power supply circuit; when the supercapacitor charging and discharging circuit is connected in series with the system power supply circuit and is connected in parallel with the external power supply circuit through the third diode, when the system power supply circuit is not powered off, the system power supply circuit supplies power to the power supply circuit required by the multi-turn encoder while also charging the supercapacitor; if the system power supply circuit is powered off, the electricity stored in the supercapacitor can continue to provide short-term power to the power supply circuit required by the multi-turn encoder.

[0026] It is understandable that the traditional sensor-type multi-turn encoder usually uses an external power supply and / or a system power supply circuit to power the multi-turn encoder. When the external power supply circuit and / or the system power supply circuit are powered off, the power supply circuit required by the multi-turn encoder will be powered off, causing the position data stored in the multi-turn encoder to be lost. In the embodiment of the present application, even if no additional backup power supply is installed at this time, the supercapacitor charging and discharging circuit can be used as the power supply circuit required by the multi-turn encoder to prevent the position data stored in the multi-turn encoder from being lost when the system power supply and the external power supply are powered off, making the production process simpler, thereby improving production efficiency.

[0027] In a preferred embodiment, see Figure 3 As shown, the power supply module also includes a current limiting circuit, which is connected to the supercapacitor charging and discharging circuit;

[0028] The power supply module suitable for the multi-turn encoder includes a battery power detection circuit, an external power supply circuit, a voltage converter, a current limiting circuit, and a supercapacitor charging and discharging circuit, wherein the current limiting circuit includes a first resistor, a second resistor, and a first transistor, wherein the first resistor is connected in parallel with the second resistor, the second resistor is connected in series with the first transistor, and the voltage converter is connected to the external power supply circuit; the voltage converter includes a battery-specific charging management chip, which is used to charge the supercapacitor with a fixed step voltage, for example, charging with a step of 200mV until the maximum charging voltage is reached;

[0029] The current limiting circuit is used to limit the charging current of the supercapacitor; when the external power supply circuit is powered on for the first time and the power of the supercapacitor is very low, there will be a large impact current, and excessive charging current will cause the service life of the supercapacitor to be reduced. The resistance of the first resistor in the current limiting circuit is greater than the second resistor. The first resistor serves as a pre-charging resistor of the supercapacitor to limit the impact current when the external power supply circuit is powered on for the first time; it can be understood that when the power is first turned on, the first transistor is in a non-conducting state. After the power is turned on for a preset period of time, the first transistor control circuit controls the first transistor to turn on based on the first control signal sent by the multi-turn encoder MCU, so that the first resistor and the second resistor are connected in parallel to limit the current of the supercapacitor charging and discharging circuit.

[0030] The power supply module also includes a second transistor, which is connected in series with the supercapacitor circuit and is used to control the conduction and disconnection of the supercapacitor circuit and the power supply circuit required for the multi-turn encoder; the second transistor is in a disconnected state based on a second control signal sent by the multi-turn encoder MCU when the system power supply circuit is in a normal power supply state, and the supercapacitor does not need to participate in the power supply of the multi-turn encoder; when the system power supply circuit is in an abnormal power supply state, the second transistor is in a conducting state based on the second control signal sent by the multi-turn encoder MCU.

[0031] The power supply module supplies power to the power supply circuit required by the multi-turn encoder. When the multi-turn encoder MCU detects that the system power supply circuit is in a normal power supply state, the second transistor is controlled to be disconnected, and the system power supply circuit supplies power to the multi-turn encoder. At the same time, the multi-turn encoder MCU controls the battery power detection circuit to detect the power contained in the external power supply. When it is detected that the voltage of the external power supply is too low, a status prompt is given to prompt the user to replace the external power supply. When the multi-turn encoder MCU detects that the system power supply circuit is in an abnormal power supply state, the second transistor is controlled to be turned on, so that the external power supply circuit supplies power to the multi-turn encoder. When the external power supply circuit is supplying power normally, the voltage converter connected to the external power supply circuit converts the output voltage of the external power supply into the rated voltage of the supercapacitor, and charges the supercapacitor at a constant voltage. Then the external power supply circuit and the supercapacitor charging and discharging circuit jointly supply power to the power supply circuit required by the multi-turn encoder.

[0032] With this arrangement, when the external power supply fails or needs to be replaced, the supercapacitor charging and discharging circuit that has been charged can be used to power the power supply circuit required by the multi-turn encoder, thereby preventing the multi-turn encoder from stopping due to a failure of the external power supply, causing the position data recorded by the multi-turn encoder to be lost.

[0033] In a preferred embodiment, if Figure 4 As shown, the power supply module suitable for multi-turn encoders includes a battery power detection circuit, an external power supply circuit, a voltage converter, a current limiting circuit, a supercapacitor charging and discharging circuit, and a system power supply circuit, wherein the supercapacitor charging and discharging circuit is connected in series with the system power supply circuit, the voltage converter is connected to the system power supply circuit, the current limiting circuit is connected in series with the supercapacitor charging and discharging circuit, and the external power supply circuit is connected in parallel with the system power supply circuit. Figure 4 , Figure 5 As shown, the current limiting circuit can be two resistors in parallel or a single resistor.

[0034] With this arrangement, when the system power supply circuit fails and power is lost, the supercapacitor charging and discharging circuit that has been charged can supply power to the power supply circuit required by the multi-turn encoder, thereby preventing the multi-turn encoder from stopping due to a failure in the system power supply circuit, causing the position data recorded by the multi-turn encoder to be lost.

[0035] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A power supply module suitable for a multi-turn encoder, characterized in that: The power supply module includes a supercapacitor charging and discharging circuit and a power supply circuit, and the supercapacitor charging and discharging circuit is connected to the power supply circuit so that the power supply circuit can charge the supercapacitor while supplying power to the power supply circuit required by the multi-turn encoder; the power supply circuit includes an external power supply circuit and a system power supply circuit; the external power supply circuit is also connected to a battery power detection circuit, and the battery power detection circuit is used to detect the power of the external power supply based on a detection signal sent by a system controller.

2. A power supply module suitable for a multi-turn encoder according to claim 1, characterized in that: The power supply circuit includes an external power supply circuit; the supercapacitor charging and discharging circuit is connected in series with the external power supply circuit through a first diode so that the external power supply circuit charges the supercapacitor in the supercapacitor charging and discharging circuit.

3. A power supply module suitable for a multi-turn encoder according to claim 1, characterized in that: The power supply circuit includes a system power supply circuit; the supercapacitor charging and discharging circuit is connected in series with the system power supply circuit, and then connected in parallel with the system power supply circuit through a second diode, so that the system power supply circuit charges the supercapacitor.

4. A power supply module suitable for a multi-turn encoder according to any one of claims 1 to 3, characterized in that: The power supply module also includes a current limiting circuit, which is connected to the supercapacitor charging and discharging circuit.

5. A power supply module suitable for a multi-turn encoder according to claim 4, characterized in that: The current limiting circuit includes a first resistor, a second resistor and a first transistor, wherein the first resistor is connected in parallel with the second resistor, and the second resistor is connected in series with the first transistor.

6. A power supply module suitable for a multi-turn encoder according to claim 4, characterized in that: The current limiting circuit includes a third resistor.

7. A power supply module suitable for a multi-turn encoder according to claim 2 or 3, characterized in that: The external power supply circuit is electrically connected to the first voltage converter; the system power supply circuit is electrically connected to the second voltage converter.

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