Temperature acquisition circuit and servo driver

Abstract

The utility model provides a temperature acquisition circuit and a servo driver. The temperature acquisition circuit comprises an analog-to-digital conversion circuit and an isolation module. One end of the analog-to-digital conversion circuit is connected with an intelligent power module of the servo driver; one end of the isolation module is connected with the other end of the analog-to-digital conversion circuit, and the other end of the isolation module is connected with a master control module of the servo driver. According to the utility model, the accuracy of collecting the temperature of the intelligent power module can be improved.

Description

Technical Field

[0001] This utility model relates to the field of servo driver technology, specifically to a temperature acquisition circuit and a servo driver. Background Technology

[0002] With the development of servo drive technology, devices are becoming increasingly intelligent, and servo drives are being used extensively. Currently, the most common method for servo drives to detect their own temperature is to install a thermistor on the servo drive and detect the temperature by measuring the change in the thermistor's resistance. However, the temperature measured by the thermistor is not accurate and deviates from the actual temperature of the servo drive's intelligent power module, resulting in low accuracy of the detection results. Utility Model Content

[0003] This invention provides a temperature acquisition circuit and a servo driver, aiming to solve the technical problem of low temperature acquisition accuracy of current servo drivers.

[0004] In a first aspect, this utility model provides a temperature acquisition circuit, which includes an analog-to-digital conversion circuit and an isolation module; one end of the analog-to-digital conversion circuit is connected to the intelligent power module of the servo driver; one end of the isolation module is connected to the other end of the analog-to-digital conversion circuit, and the other end of the isolation module is connected to the main control module of the servo driver.

[0005] Furthermore, the analog-to-digital conversion circuit includes a voltage reference setting circuit, a voltage divider circuit, and a filter circuit; one end of the voltage divider circuit is connected to the intelligent power module, the other end of the voltage divider circuit is connected to one end of the filter circuit and one end of the voltage reference setting circuit, the other end of the filter circuit is grounded, and the other end of the voltage reference setting circuit is connected to the isolation module.

[0006] Furthermore, the voltage divider circuit includes a first resistor and a second resistor; one end of the first resistor is connected to the intelligent power module, the other end of the first resistor is connected to one end of the second resistor and one end of the filter circuit, and the other end of the second resistor is grounded.

[0007] Furthermore, the filter circuit includes a first capacitor, one end of which is connected to the voltage divider circuit, and the other end of which is grounded.

[0008] Furthermore, the voltage reference setting circuit includes a voltage reference setting chip, the reference stage of the voltage reference setting chip is connected to the voltage divider circuit, the positive terminal of the voltage reference setting chip is grounded, and the negative terminal of the voltage reference setting chip is connected to the isolation module.

[0009] Furthermore, the isolation module includes an optocoupler, one end of which is connected to the voltage reference setting circuit, and the other end of which is connected to the main control module.

[0010] Furthermore, the isolation module also includes a third resistor and a fourth resistor. One end of the third resistor is connected to the voltage reference setting circuit, and the other end of the third resistor is connected to the optocoupler. One end of the fourth resistor is connected to the power supply terminal, and the other end of the fourth resistor is connected to the optocoupler.

[0011] Furthermore, the isolation module also includes a fifth resistor and a sixth resistor. One end of the fifth resistor and one end of the sixth resistor are both connected to the optocoupler. The other end of the fifth resistor is connected to the main control module, and the other end of the sixth resistor is connected to the power supply terminal.

[0012] Furthermore, the isolation module also includes a second capacitor, one end of which is connected to the fifth resistor, and the other end of which is grounded.

[0013] Secondly, this utility model also provides a servo driver, the servo driver including a main control module, an intelligent power module, and a temperature acquisition circuit as described in any one of the above; the intelligent power module includes a temperature detection circuit and a control circuit, the temperature detection circuit is connected to the control circuit, and the control circuit is connected to the temperature acquisition circuit.

[0014] The servo driver disclosed in this utility model includes a temperature acquisition circuit, a main control module, and an intelligent power module. The intelligent power module includes a temperature detection circuit and a control circuit. The temperature acquisition circuit includes an analog-to-digital converter circuit and an isolation module. The analog-to-digital converter circuit is connected to the intelligent power module and the isolation module respectively. It can acquire the analog signal output by the intelligent power module that is positively correlated with the temperature, convert the analog signal into a digital signal, and then output the digital signal to the main control module through the isolation module, thereby realizing the temperature acquisition of the intelligent power module. Since it can directly acquire the analog voltage that is positively correlated with the temperature of the intelligent power module, the accuracy of temperature detection can be improved. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a block diagram of a temperature acquisition circuit provided in an embodiment of the present invention;

[0017] Figure 2 This is a block diagram of a temperature acquisition circuit provided in another embodiment of the present invention;

[0018] Figure 3 This is a circuit diagram of a temperature acquisition circuit provided in one embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be understood that, when used in this specification and the appended claims, the terms “comprising” and “including” indicate the presence of the described features, integrals, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0022] Furthermore, the directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are only for reference to the accompanying drawings and the product's usage state. Therefore, the directional terms used are for explaining and understanding this invention, and not for limiting it. Additionally, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.

[0023] See Figures 1 to 3 , Figure 1 This is a block diagram of a temperature acquisition circuit 100 provided in an embodiment of the present invention; Figure 2 This is a block diagram of a temperature acquisition circuit 100 provided in another embodiment of the present invention; Figure 3 This is a circuit diagram of a temperature acquisition circuit 100 provided in one embodiment of this utility model. Figure 1As shown, the temperature acquisition circuit 100 includes an analog-to-digital converter circuit 10 and an isolation module 20; one end of the analog-to-digital converter circuit 10 is connected to the intelligent power module 200 of the servo driver; one end of the isolation module 20 is connected to the other end of the analog-to-digital converter circuit 10, and the other end of the isolation module 20 is connected to the main control module 300 of the servo driver.

[0024] Specifically, the servo driver may include a temperature acquisition circuit 100, a main control module 300, and an intelligent power module 200. The intelligent power module 200 may include a temperature detection circuit 220 and a control circuit 210. The temperature detection circuit 220 is used to acquire the temperature of the intelligent power module 200. For example, a temperature sensor may be integrated into the intelligent power module 200 to acquire the temperature of the intelligent power module 200. At the same time, the control circuit 210 can output an analog voltage that is positively correlated with the temperature.

[0025] The temperature acquisition circuit 100 may include an analog-to-digital converter (ADC) 10 and an isolation module 20. The ADC 10 is connected to both the intelligent power module 200 and the isolation module 20, and is used to set a reference voltage and convert analog signals into digital signals. For example, the ADC 10 is connected to a control circuit 210 to acquire an analog signal output by the control circuit 210 that is positively correlated with temperature, and converts the analog signal into a digital signal. This digital signal is linearly correlated with the temperature of the intelligent power module 200, thus linearly reflecting the temperature of the intelligent power module 200.

[0026] The isolation module 20 is connected to the analog-to-digital conversion circuit 10 and the main control module 300 respectively to achieve electrical isolation, that is, to block the interference from the intelligent power module 200 from entering the main control, and at the same time to convert the on / off analog logic into digital level.

[0027] For example, suppose the threshold temperature of the intelligent power module 200 is 93℃ and the reference voltage of the analog-to-digital converter circuit 10 is 2.5V. When the output voltage of the intelligent power module 200 is greater than 2.5V, such as 2.83V, the analog-to-digital converter circuit 10 is turned on, and then the isolation module 20 outputs a first-level signal, indicating that the intelligent power module 200 is over-temperature. If the output voltage of the intelligent power module 200 is less than 2.5V, the analog-to-digital converter circuit 10 is turned off, and then the isolation module 20 outputs a second-level signal, indicating that the temperature of the intelligent power module 200 is normal.

[0028] As a further embodiment, the analog-to-digital conversion circuit 10 includes a voltage reference setting circuit 11, a voltage divider circuit 12, and a filter circuit 13; one end of the voltage divider circuit 12 is connected to the intelligent power module 200, the other end of the voltage divider circuit 12 is connected to one end of the filter circuit 13 and one end of the voltage reference setting circuit 11 respectively, the other end of the filter circuit 13 is grounded, and the other end of the voltage reference setting circuit 11 is connected to the isolation module 20.

[0029] The analog-to-digital conversion circuit 10 includes a voltage reference setting circuit 11, a voltage divider circuit 12, and a filter circuit 13. The voltage divider circuit 12 is connected to the intelligent power module 200 to collect the analog voltage output by the intelligent power module 200 and divide the analog voltage. At the same time, the voltage divider circuit 12 is also connected to the filter circuit 13 and the voltage reference setting circuit 11. The filter circuit 13 can filter out noise and avoid false triggering. When the analog voltage reaches the threshold of the voltage reference setting circuit 11, the voltage reference setting circuit 11 is turned on, and otherwise it is turned off.

[0030] As a further embodiment, the voltage divider circuit 12 includes a first resistor R1 and a second resistor R2; one end of the first resistor R1 is connected to the intelligent power module 200, the other end of the first resistor R1 is connected to one end of the second resistor R2 and one end of the filter circuit 13, and the other end of the second resistor R2 is grounded.

[0031] The voltage divider circuit 12 may include a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected to the intelligent power module 200, and the other end of the first resistor R1 is connected to one end of the second resistor R2, the filter circuit 13, and the voltage reference setting circuit 11. The first resistor R1 and the second resistor R2 are used to divide the acquired voltage, and the divided voltage is filtered by the filter circuit 13 to remove interference before being output to the voltage reference setting circuit 11. The mapping relationship between temperature, voltage, and threshold can be precisely set by the first resistor R1 and the second resistor R2 to ensure that the intelligent power module 200 is triggered precisely when its temperature reaches the threshold temperature.

[0032] As a further embodiment, the filter circuit 13 includes a first capacitor C1, one end of which is connected to the voltage divider circuit 12, and the other end of which is grounded.

[0033] The first capacitor C1 is a filter capacitor, with one end connected to the filter circuit 13, or to the first resistor R1, and the other end grounded. The first capacitor C1 is used to filter out high-frequency noise from the power supply or signal, preventing false triggering caused by voltage fluctuations in the voltage reference setting circuit 11.

[0034] As a further embodiment, the voltage reference setting circuit 11 includes a voltage reference setting chip U1, the reference stage of the voltage reference setting chip U1 is connected to the voltage divider circuit 12, the positive terminal of the voltage reference setting chip U1 is grounded, and the negative terminal of the voltage reference setting chip U1 is connected to the isolation module 20.

[0035] The voltage reference setting circuit 11 may include a voltage reference setting chip U1, which includes a positive terminal, a negative terminal, and a reference stage. The reference stage of the voltage reference setting chip U1 is connected to the voltage divider circuit 12, such as to the first resistor R1. The positive terminal of the voltage reference setting chip U1 is grounded, and the negative terminal of the voltage reference setting chip U1 is connected to the isolation module 20.

[0036] like Figure 3 As shown, the analog signal from the intelligent power module 200 is output to the first resistor R1 and the second resistor R2 through the VOT pin. After being divided by the first resistor R1 and the second resistor R2, the signal is output to the reference stage of the voltage reference setting chip U1. The positive terminal of the voltage reference setting chip U1 is grounded to form a loop, and the negative terminal of the voltage reference setting chip U1 is connected to the isolation module 20. When the analog voltage at the VOT terminal is sufficient, the voltage reference setting chip U1 is turned on; when the analog voltage at the VOT terminal is insufficient, the voltage reference setting chip U1 is turned off.

[0037] As a further embodiment, the isolation module 20 includes an optocoupler U2, one end of which is connected to the voltage reference setting circuit 11, and the other end of which is connected to the main control module 300. Further, the isolation module 20 also includes a third resistor R3 and a fourth resistor R4. One end of the third resistor R3 is connected to the voltage reference setting circuit 11, and the other end of the third resistor R3 is connected to the optocoupler U2. One end of the fourth resistor R4 is connected to the power supply terminal, and the other end of the fourth resistor R4 is connected to the optocoupler U2. Further, the isolation module 20 also includes a fifth resistor R5 and a sixth resistor R6. One end of the fifth resistor R5 and one end of the sixth resistor R6 are both connected to the optocoupler U2. The other end of the fifth resistor R5 is connected to the main control module 300, and the other end of the sixth resistor R6 is connected to the power supply terminal. Further, the isolation module 20 also includes a second capacitor C2, one end of which is connected to the fifth resistor R5, and the other end of the second capacitor C2 is grounded.

[0038] The isolation module 20 may include an optocoupler U2. The positive terminal of the input side of the optocoupler U2 is connected to the power supply terminal through a fourth resistor R4, and the negative terminal of the input side of the optocoupler U2 is connected to the voltage reference setting circuit 11 through a third resistor R3, such as being connected to the negative terminal of the voltage reference setting chip U1. When the temperature of the intelligent power module 200 exceeds the threshold temperature, the voltage reference setting chip U1 is turned on, the cathode is grounded, and the light-emitting diode of the optocoupler U2 forms a circuit, causing the light-emitting diode of the optocoupler U2 to emit light. When the temperature of the intelligent power module 200 does not exceed the temperature threshold, the voltage reference setting chip U1 is turned off, the light-emitting diode has no current, and does not emit light.

[0039] The collector of the output side of the optocoupler U2 is connected to the power supply terminal through the sixth resistor R6, and its emitter is connected to the main control module 300 through the fifth resistor R5. When the LED emits light, the phototransistor is turned on by the light, and the collector and emitter are directly connected. The emitter potential is pulled down to near GND, and a low-level signal is output. The main control module 300 detects over-temperature. When the LED does not emit light, the phototransistor is cut off, and the emitter is kept at a high level through the load resistor. The main control module detects a normal signal.

[0040] This utility model also discloses a servo driver, which includes a main control module 300, an intelligent power module 200, and a temperature acquisition circuit 100 as described in any of the above embodiments. The intelligent power module 200 includes a temperature detection circuit 220 and a control circuit 210. The temperature detection circuit 220 is connected to the control circuit 210, and the control circuit 210 is connected to the temperature acquisition circuit 100. The temperature acquisition circuit 100 includes an analog-to-digital converter circuit 10 and an isolation module 20. One end of the analog-to-digital converter circuit 10 is connected to the intelligent power module 200 of the servo driver. One end of the isolation module 20 is connected to the other end of the analog-to-digital converter circuit 10, and the other end of the isolation module 20 is connected to the main control module 300 of the servo driver.

[0041] Specifically, the servo driver may include a temperature acquisition circuit 100, a main control module 300, and an intelligent power module 200. The intelligent power module 200 may include a temperature detection circuit 220 and a control circuit 210. The temperature detection circuit 220 is used to acquire the temperature of the intelligent power module 200. For example, a temperature sensor may be integrated into the intelligent power module 200 to acquire the temperature of the intelligent power module 200. At the same time, the control circuit 210 can output an analog voltage that is positively correlated with the temperature.

[0042] The temperature acquisition circuit 100 may include an analog-to-digital converter (ADC) 10 and an isolation module 20. The ADC 10 is connected to both the intelligent power module 200 and the isolation module 20, and is used to set a reference voltage and convert analog signals into digital signals. For example, the ADC 10 is connected to a control circuit 210 to acquire an analog signal output by the control circuit 210 that is positively correlated with temperature, and converts the analog signal into a digital signal. This digital signal is linearly correlated with the temperature of the intelligent power module 200, thus linearly reflecting the temperature of the intelligent power module 200.

[0043] The isolation module 20 is connected to the analog-to-digital conversion circuit 10 and the main control module 300 respectively to achieve electrical isolation, that is, to block the interference from the intelligent power module 200 from entering the main control, and at the same time to convert the on / off analog logic into digital level.

[0044] For example, suppose the threshold temperature of the intelligent power module 200 is 93℃ and the reference voltage of the analog-to-digital converter circuit 10 is 2.5V. Then, when the output voltage of the intelligent power module 200 is greater than 2.5V, such as 2.83V, the analog-to-digital converter circuit 10 is turned on, and the isolation module 20 outputs a first-level signal indicating that the intelligent power module 200 is over-temperature. If the output voltage of the intelligent power module 200 is less than 2.5V, the analog-to-digital converter circuit 10 is turned off, and the isolation module 20 outputs a second-level signal indicating that the temperature of the intelligent power module 200 is normal.

[0045] This utility model discloses a servo driver intelligent power module that can output an analog signal positively correlated with temperature. This analog signal can be acquired by an analog-to-digital converter circuit and converted into a digital signal. An isolation module can send the digital signal to the main control module, thereby realizing the acquisition of the temperature of the intelligent power module and improving the acquisition accuracy.

[0046] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A temperature acquisition circuit, characterized in that, The temperature acquisition circuit, used in a servo driver, includes: An analog-to-digital converter circuit, one end of which is connected to the intelligent power module of the servo driver; An isolation module is provided, one end of which is connected to the other end of the analog-to-digital conversion circuit, and the other end of which is connected to the main control module of the servo driver.

2. The temperature acquisition circuit as described in claim 1, characterized in that, The analog-to-digital conversion circuit includes a voltage reference setting circuit, a voltage divider circuit, and a filter circuit. One end of the voltage divider circuit is connected to the intelligent power module, and the other end of the voltage divider circuit is connected to one end of the filter circuit and one end of the voltage reference setting circuit, respectively. The other end of the filter circuit is grounded, and the other end of the voltage reference setting circuit is connected to the isolation module.

3. The temperature acquisition circuit as described in claim 2, characterized in that, The voltage divider circuit includes a first resistor and a second resistor; One end of the first resistor is connected to the intelligent power module, and the other end of the first resistor is connected to one end of the second resistor and one end of the filter circuit, respectively. The other end of the second resistor is grounded.

4. The temperature acquisition circuit as described in claim 2, characterized in that, The filter circuit includes a first capacitor, one end of which is connected to the voltage divider circuit, and the other end of which is grounded.

5. The temperature acquisition circuit as described in claim 2, characterized in that, The voltage reference setting circuit includes a voltage reference setting chip. The reference stage of the voltage reference setting chip is connected to the voltage divider circuit. The positive terminal of the voltage reference setting chip is grounded, and the negative terminal of the voltage reference setting chip is connected to the isolation module.

6. The temperature acquisition circuit as described in claim 2, characterized in that, The isolation module includes an optocoupler, one end of which is connected to the voltage reference setting circuit, and the other end of which is connected to the main control module.

7. The temperature acquisition circuit as described in claim 6, characterized in that, The isolation module further includes a third resistor and a fourth resistor. One end of the third resistor is connected to the voltage reference setting circuit, and the other end of the third resistor is connected to the optocoupler. One end of the fourth resistor is connected to the power supply terminal, and the other end of the fourth resistor is connected to the optocoupler.

8. The temperature acquisition circuit as described in claim 6, characterized in that, The isolation module further includes a fifth resistor and a sixth resistor. One end of the fifth resistor and one end of the sixth resistor are both connected to the optocoupler. The other end of the fifth resistor is connected to the main control module, and the other end of the sixth resistor is connected to the power supply.

9. The temperature acquisition circuit as described in claim 8, characterized in that, The isolation module also includes a second capacitor, one end of which is connected to the fifth resistor, and the other end of which is grounded.

10. A servo driver, characterized in that, Includes a main control module, an intelligent power module, and a temperature acquisition circuit as described in any one of claims 1-9; The intelligent power module includes a temperature detection circuit and a control circuit. The temperature detection circuit is connected to the control circuit, and the control circuit is connected to the temperature acquisition circuit.

Images