Actuator current sampling circuit
By designing an actuator current sampling circuit including sampling resistor, current sampling chip, transistor and comparator, the problem of difficulty in sampling high-voltage current lines in the prior art is solved, and the current sampling effect with simple structure, low cost and accurate signal is achieved.
Patent Information
- Application Number
- CN202421194904.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-05-29
AI Technical Summary
Existing sampling circuits are difficult to sample currents on current lines with higher voltages in the actuator, resulting in complex and costly circuit construction.
An actuator current sampling circuit is designed, and the current signal of the actuator main circuit is converted into a voltage signal through components such as the first sampling resistor, the current sampling chip, the transistor and the second sampling resistor, and the signal comparison is performed through the comparator to realize current sampling.
The circuit structure is simple, which reduces the complexity of circuit construction, avoids the use of a large number of electronic devices, reduces costs, and improves the anti-interference ability of the signal and the accuracy of sampling.
Smart Images
Figure CN222882762U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of current sampling, in particular to an actuator current sampling circuit. Background Art
[0002] Existing sampling circuits seldom perform current sampling on current lines with higher voltages in actuators, because a large number of electronic devices are required to perform voltage reduction and sampling for signal sampling. A large number of electronic devices complicates circuit construction and operation, and also increases procurement costs. Therefore, a sampling circuit with a simple structure that can perform current sampling on current lines with higher voltages is needed. The present utility model solves this technical problem. Utility Model Content
[0003] The utility model provides an actuator current sampling circuit, which can perform current sampling on a current line with a relatively high voltage. The circuit structure is simple, the complexity of circuit construction is reduced, and the problem of needing to use a large number of electronic devices for voltage reduction can be well solved.
[0004] An actuator current sampling circuit comprises a first sampling resistor connected to a main circuit of the actuator, a current sampling chip electrically connected to the first sampling resistor, a transistor connected to the current sampling chip, a second sampling resistor connected to the transistor, and a comparator electrically connected to the second sampling resistor, wherein the comparator is electrically connected to an isolation optocoupler, the first sampling resistor is used to convert a current signal on the main circuit of the actuator into a voltage signal, the transistor is used to amplify the current signal, and the second sampling resistor is used to convert the current signal into a voltage signal.
[0005] Furthermore, the transistor is connected to a plurality of voltage-dropping resistors, and the plurality of voltage-dropping resistors are electrically connected to the N line.
[0006] Furthermore, the transistor includes a first transistor connected to the current sampling chip and a second transistor connected to the first transistor, and the second transistor is connected to the comparator. When the voltage signal exceeds the reference point of the comparator, the comparator will flip and output a low level, otherwise it will output a high level.
[0007] Furthermore, the isolation optocoupler is electrically connected to an optocoupler current limiting resistor.
[0008] Furthermore, the first sampling resistor is electrically connected to the first protection resistor and is connected in parallel with the first capacitor.
[0009] Furthermore, the second sampling resistor is connected in parallel with the second protection resistor and the second capacitor.
[0010] The technical effects of the utility model are as follows:
[0011] This solution samples by converting the voltage signal of the actuator main circuit into a current signal. There is no need to reduce the voltage through a large number of electronic devices. It has a simple structure and reduces the complexity of circuit construction. Before the collected signal enters the comparator, it exists in the form of current, has strong anti-interference ability, and improves the accuracy of sampling. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a circuit diagram of the utility model.
[0013] Among them, the figure markings are: R1, second protection resistor; R2, first sampling resistor; R3, first protection resistor; R4, second sampling resistor; R5, optocoupler output pull-up resistor; R7, first step-down resistor; R9, optocoupler current limiting resistor; R10, first reference resistor; R11, second reference resistor; R12, second step-down resistor; R13, third step-down resistor; R14, fourth step-down resistor; T1, first transistor; T2, second transistor; U1, comparator; U2, current sampling chip; PC1, isolation optocoupler; C1, second capacitor; C2, first capacitor; C7, optocoupler output filter ceramic. DETAILED DESCRIPTION
[0014] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments and drawings.
[0015] See also Figure 1 , an actuator current sampling circuit, including a first sampling resistor R2 connected to a P line of a main circuit of the actuator, a current sampling chip U2 electrically connected to the first sampling resistor R2, a transistor connected to the current sampling chip U2, a second sampling resistor R4 connected to the transistor, and a comparator U1 electrically connected to the second sampling resistor R4, the comparator U1 is electrically connected to an isolation optical coupler PC1, the first sampling resistor R2 is used to convert a current signal on the main circuit of the actuator into a voltage signal, the transistor is used to amplify the current signal, and the second sampling resistor R4 is used to convert the current signal into a voltage signal.
[0016] The P line on the left in this embodiment is a current line with a relatively high voltage, that is, this embodiment performs sampling on this P line, and the magnitude of the current output by the current sampling chip U2 is proportional to the voltage collected by the first sampling resistor R2.
[0017] Furthermore, the transistor is connected to a plurality of drop-down resistors, and the plurality of drop-down resistors are electrically connected to the N line. The drop-down resistors in this embodiment include a first drop-down resistor R7, a second drop-down resistor R12, a third drop-down resistor R13, and a fourth drop-down resistor R14, which are used to provide a base operating current to the first transistor T1 and the second transistor T2.
[0018] Furthermore, the transistor includes a first transistor T1 connected to the current sampling chip U2, a second transistor T2 connected to the first transistor T1, and the second transistor T2 is connected to the comparator U1. When the voltage signal exceeds the reference point of the comparator U1, the comparator U1 will flip and output a low level, otherwise it will output a high level signal.
[0019] Furthermore, the isolation optocoupler PC1 is electrically connected to the optocoupler current limiting resistor R9, and the isolation optocoupler PC1 is electrically connected to the CPU. The isolation optocoupler PC1 in this embodiment is electrically connected to the optocoupler output filter ceramic C7 and the optocoupler output pull-up resistor R5.
[0020] Furthermore, the first sampling resistor R2 is electrically connected to the first protection resistor R3 and is connected in parallel to the first capacitor C2.
[0021] The comparator U1 in this embodiment is also electrically connected to the first reference resistor R10 and the second reference resistor R11 .
[0022] Furthermore, the second sampling resistor R4 is connected in parallel with the second protection resistor R1 and the second capacitor C1.
[0023] See also Figure 1 Preferably, based on the above content, some electronic devices such as resistors and capacitors are added in this embodiment. Those skilled in the art can Figure 1 The connection relationship between the various electronic components can be understood. Since the above content can achieve the technical effect of this solution, the connection method of other electronic components will not be described in detail here.
[0024] The working principle of this embodiment is as follows:
[0025] The first sampling resistor R2 is used to sample the current of the P line of the actuator main circuit, and convert the current signal on the P line of the actuator main circuit into a voltage signal. The voltage signal will be sent to the current sampling chip U2, and the current sampling chip U2 will output the current signal according to the size of the sampled voltage. The size of the output current is proportional to the collected voltage signal;
[0026] The output current will pass through the first transistor T1 and the second transistor T2 for current amplification. After the amplified current signal passes through the second sampling resistor R4, the second sampling resistor R4 will convert the current signal into a voltage signal. The converted voltage signal will be transmitted to the comparator U1 and compared with the reference point of the comparator U1.
[0027] When the voltage signal is higher than the reference point, the comparator U1 flips and outputs a low-level signal. The isolation optocoupler PC1 is turned on through the optocoupler current-limiting resistor R9, and the secondary side of the isolation optocoupler PC1 outputs a low-level signal, which is transmitted to the CPU. If the voltage signal is lower than the reference point, the comparator U1 continues to maintain a high-level signal. The circuit formed by the above structure has a simple topology and fewer components, which makes the circuit construction simpler and saves the procurement cost of electronic components.
[0028] The above embodiments are only preferred embodiments of the present utility model. Those skilled in the art can obtain other embodiments from the above embodiments without creative work. Therefore, the present application protects not only the above embodiments, but also the scope consistent with the principles and features of the present application.
Claims
1. An actuator current sampling circuit, characterized in that: The invention comprises a first sampling resistor (R2) connected to a main circuit of an actuator, a current sampling chip (U2) electrically connected to the first sampling resistor (R2), a transistor connected to the current sampling chip (U2), a second sampling resistor (R4) connected to the transistor, and a comparator (U1) electrically connected to the second sampling resistor (R4), wherein the comparator (U1) is electrically connected to an isolation optical coupler (PC1), the first sampling resistor (R2) is used to convert a current signal on the main circuit of the actuator into a voltage signal, the transistor is used to amplify the current signal, and the second sampling resistor (R4) is used to convert the current signal into a voltage signal.
2. The actuator current sampling circuit according to claim 1, characterized in that: The transistor is connected to a plurality of voltage-dropping resistors, and the voltage-dropping resistors are electrically connected to the N line.
3. The actuator current sampling circuit according to claim 2, characterized in that: The transistor comprises a first transistor (T1) connected to the current sampling chip (U2), a second transistor (T2) connected to the first transistor (T1), and the second transistor (T2) is connected to the comparator (U1).
4. The actuator current sampling circuit according to claim 1, characterized in that: The isolation optocoupler (PC1) is electrically connected to the optocoupler current limiting resistor (R9).
5. The actuator current sampling circuit according to claim 1, characterized in that: The first sampling resistor (R2) is electrically connected to the first protection resistor (R3) and is connected in parallel to the first capacitor (C2).
6. The actuator current sampling circuit according to claim 1, characterized in that: The second sampling resistor (R4) is connected in parallel with the second protection resistor (R1) and the second capacitor (C1).