Holding type shunt release
The solenoid control of the retaining-type split-excitation tripper is achieved through pure hardware circuits, which solves the problems of complex control circuits, large power consumption and poor anti-interference capabilities in the prior art, and achieves the effects of simple circuits, low power consumption and cost-effectiveness.
Patent Information
- Application Number
- CN202421853910.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The existing retaining type excitation tripper has complex electromagnetic control circuits, large power consumption, poor anti-interference ability, and high cost.
Pure hardware circuits are used to realize the control of the electromagnet, including rectifier circuits, power supply circuits, oscillation circuits and timing circuits. The pulse control signals are generated through these circuits and the single-coil electromagnet is driven to operate in the periodic pulse current state.
It realizes the advantages of simple and reliable circuit, low power consumption, strong anti-interference ability and low cost, ensuring that the excitation tripper works stably when maintaining the suction-engaged state.
Smart Images
Figure CN222851366U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a shunt release, in particular to a holding type shunt release. Background Art
[0002] At present, most of the electric control of switchgear equipment uses electromagnet devices to perform actions, such as electric closing and opening, various releases, remote reset, etc. For the shunt release used for electric opening of switchgear, it is usually not necessary to keep the energized state for a long time after power is turned on. It only needs to be attracted and kept attracted for a short time after power is turned on. It is generally called a pulse-type shunt release. However, in some special occasions, the shunt release needs to remain in the attracted state without power failure after power is turned on, and it will not be released until the power is turned off, such as electrical interlocking or electrical safety locking, which is generally called a holding-type shunt release.
[0003] The most common structures of electromagnets used for holding type shunt releases are double coil structures and single coil structures. For shunt releases using single coil electromagnets, full voltage is generally applied when attracted and pulse voltage is applied when held to control the temperature rise of the coil when held, so as to avoid damage caused by excessive working temperature of the coil. The control circuit of existing electromagnets generally uses a single chip microcomputer as the core controller to control the working state of the coil. The use of a single chip microcomputer will inevitably make the circuit more complicated, the power consumption of the single chip microcomputer is large, the power requirements of the power supply circuit are high, the control heat is also large, and the anti-interference ability of the single chip microcomputer circuit is poor, and it is easy to be affected by harmonic interference and cause abnormal operation. In addition, the cost of the single chip microcomputer is relatively high. Utility Model Content
[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a holding type shunt release, whose electromagnet control circuit is realized by a pure hardware circuit without the use of a single-chip microcomputer, and has the advantages of simple and reliable circuit, low power consumption, strong anti-interference ability and low cost.
[0005] The utility model specifically adopts the following technical solutions:
[0006] A holding type shunt release comprises a single-coil electromagnet, a switch circuit for controlling the on and off of the single-coil electromagnet, and a control circuit for controlling the switch circuit; the control circuit comprises: a rectifier circuit for converting a grid voltage into a DC voltage and serving as a working power supply voltage for the single-coil electromagnet; a power supply circuit for stepping down the DC voltage into a low-voltage DC voltage;
[0007] an oscillator circuit, which uses the low-voltage DC voltage as a working power supply and is used to generate a pulse control signal for the switch circuit;
[0008] The timing circuit uses the low-voltage DC voltage as a working power supply and is used to drive the oscillation circuit to first output a high-level single pulse control signal with a larger pulse width, and then continuously output a periodic pulse control signal with a smaller pulse width after the low-voltage DC power is established.
[0009] Preferably, the timing circuit includes a diode D6, a diode D8 and a capacitor C1, one end of the capacitor C1 is connected to the anode of the diode D6 and the cathode of the diode D8, the other end of the capacitor C1 is grounded, and the cathode of the diode D6 is connected to the low-voltage DC voltage; the oscillation circuit includes a resistor R2, a capacitor C2, and an integrated circuit IC1, and the integrated circuit IC1 is a timing circuit 7555; the cathode of the diode D6 is connected to pins 4 and 8 of the integrated circuit IC1, one end of the resistor R2, one end of the capacitor C2, and the anode of the diode D8 are connected to pins 2 and 6 of the integrated circuit IC1, the other end of the resistor R2 is connected to pin 3 of the integrated circuit IC1, the other end of the capacitor C2 and pin 1 of the integrated circuit IC1 are commonly connected to the ground, and pin 3 of the integrated circuit IC1 is used to output a pulse control signal; the capacity of the capacitor C1 is much larger than the capacity of the capacitor C2.
[0010] Preferably, the switching circuit includes an electronic switch and a diode, the diode is connected in parallel with the coil of the single-coil electromagnet, the cathode of the diode is connected to the DC voltage, the anode of the diode is connected to the input end of the electronic switch, the control end of the electronic switch is connected to the pulse control signal output by the oscillation circuit, and the output end of the electronic switch is grounded.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] The utility model adopts the timing circuit and the oscillation circuit realized by pure hardware to cooperate. After power is turned on, the timing circuit controls the oscillation circuit not to oscillate in the initial stage of power-on, but outputs a high-level single pulse control signal with a large pulse width to control the single-coil electromagnet to be fully voltage-attracted. Then, after a preset length of time, the oscillation circuit is controlled to start oscillation and continuously output a periodic pulse control signal with a small pulse width to drive the single-coil electromagnet to work in a periodic pulse current state, so that the shunt releaser works in a small current maintained attraction state. The utility model does not need to use a single-chip microcomputer circuit, and has the advantages of simple and reliable circuit, low power consumption, strong anti-interference ability and low cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a control circuit principle block diagram of the utility model holding type shunt release;
[0014] Figure 2 A specific implementation circuit diagram of the control circuit;
[0015] Figure 3 for Figure 2The working process and principle diagram of the circuit shown. DETAILED DESCRIPTION
[0016] In view of the shortcomings of the prior art in using a single-chip microcomputer circuit to control a single-coil electromagnet, the solution of the utility model is to use a timing circuit and an oscillation circuit implemented purely in hardware to cooperate. After power is turned on, the timing circuit controls the oscillation circuit not to oscillate in the initial stage of power-on, but to output a high-level single pulse control signal with a larger pulse width to control the single-coil electromagnet to be fully voltage-closed. Then, after a preset length of time, the oscillation circuit is controlled to start oscillating and continuously output a periodic pulse control signal with a smaller pulse width, driving the single-coil electromagnet to work in a periodic pulse current state, so that the shunt release works in a small current maintained closed state.
[0017] In order to facilitate public understanding, the technical solution of the utility model is described in detail below with reference to the accompanying drawings:
[0018] The holding type shunt release proposed by the utility model is as follows Figure 1 As shown, it includes a single-coil electromagnet, a switch circuit for controlling the on and off of the single-coil electromagnet, and a control circuit for controlling the switch circuit; the control circuit includes: a rectifier circuit, a power supply circuit, an oscillation circuit, and a timing circuit. Figure 1 As shown, the grid power supply voltage Ui is rectified by the rectifier circuit to become a DC voltage U1, which is the working power supply voltage of the single-coil electromagnet; the DC voltage U1 is reduced by the power supply circuit to become a low-voltage DC voltage U2 as the working power supply of the timing circuit and the oscillation circuit; the oscillation circuit is used to output a pulse control signal of the switch circuit, and the timing circuit is used to generate a control voltage U3 to control the output of the oscillation circuit. The timing circuit and the oscillation circuit start to work after being energized. After being energized, the timing circuit controls the oscillation circuit not to oscillate at the beginning of the power-on period, but outputs a high-level single pulse control signal Uo1 with a large pulse width to control the switch circuit to be turned on. During the period when the switch circuit is turned on, the full voltage of the coil is applied to make the electromagnet close. After a fixed time length t1, the timing circuit loses control of the oscillation circuit, and the oscillation circuit starts to oscillate and continuously outputs a periodic pulse control signal Uo1 with a small pulse width to control the switch circuit to be turned on periodically, so that the coil is periodically applied with a pulse voltage and works in a periodic pulse current state, so that the shunt release works in a small current and keeps being attracted.
[0019] The above functional circuits can be realized by selecting various existing technologies according to actual conditions. Figure 2 One of the specific implementation circuits is shown, which uses a low-power time base circuit 7555 to form an oscillation circuit, and has the advantages of simple circuit structure, low power consumption, and stable electromagnet attraction.
[0020] like Figure 2As shown, the rectifier circuit includes diodes D1 to D4, which are used to convert the power input voltage Ui into a DC voltage U1.
[0021] The power supply circuit includes a resistor R1 and a diode D5. One end of the resistor R1 is connected to a DC voltage U1, the other end of the resistor R1 is connected to a cathode of the diode D5, an anode of the diode D5 is grounded, and a common connection point between the resistor R1 and the diode D5 serves as an output end of a low DC voltage U2.
[0022] The timing circuit includes a diode D6, a diode D8 and a capacitor C1, one end of the capacitor C1 is connected to the anode of the diode D6 and the cathode of the diode D8, the other end of the capacitor C1 is grounded, and the cathode of the diode D6 is connected to the low-voltage DC voltage U2; the oscillation circuit includes a resistor R2, a capacitor C2, and an integrated circuit IC1, and the integrated circuit IC1 is a time base circuit 7555; the cathode of the diode D6 is connected to the 4th and 8th pins of the integrated circuit IC1; one end of the resistor R2, one end of the capacitor C2, and the anode of the diode D8 in the timing circuit are connected to the 2nd and 6th pins of the integrated circuit IC1; the other end of the resistor R2 is connected to the 3rd pin of the integrated circuit IC1; the other end of the capacitor C2 and the 1st pin of the integrated circuit IC1 are connected to the ground; the 3rd pin of the integrated circuit IC1 is used to output the pulse control signal Uo1; the capacity of the capacitor C1 in the timing circuit is much larger than the capacity of the capacitor C2 in the oscillation circuit.
[0023] The switch circuit includes a MOS tube VT1 and a diode D7. The diode D7 is connected in parallel with the coil L1 of the single-coil electromagnet. The cathode of the diode D7 is connected to the DC voltage U1, the anode of the diode D7 is connected to the drain of the MOS tube VT1, the gate of the MOS tube VT1 is connected to the pulse control signal Uo1, and the source of the MOS tube VT1 is grounded. The function of the switch circuit is to control the power on and off of the coil L1.
[0024] Figure 2 The working process and principle of the circuit shown are as follows Figure 3 As shown, the details are as follows:
[0025] The power supply voltage Ui is rectified by the rectifier circuit and becomes a DC voltage U1. The DC voltage U1 is stepped down by the power supply circuit to obtain a low-voltage DC voltage U2, which is used to provide the working power supply for IC1.
[0026] After the integrated circuit IC1 is powered on, due to the characteristic that the voltage across the capacitor C2 cannot change suddenly, the 2nd pin of the integrated circuit IC1 is at a low level. According to the characteristics of the integrated circuit 7555, the 3rd pin of IC1 outputs a high level Uo1. The high level Uo1 charges the capacitor C2 through the resistor R2 in one way and charges the capacitor C1 through the diode D8 in the other way. When the voltage of the capacitor C2 is less than When U2 is on, the control voltage Uo1 output from the 3rd pin of the integrated circuit IC1 maintains a high level output, controlling the opening of the switch circuit, thereby controlling the coil to be energized to generate electromagnetic attraction; since the capacity of capacitor C1 is much larger than that of capacitor C2, when capacitors C1 and C2 are charged at the same time, the voltage of capacitor C2 rises slowly. As the voltage of capacitor C2 increases, according to the characteristics of the integrated circuit 7555, when the voltage of capacitor C2 is greater than U2, the control voltage Uo1 output by the 3rd pin of the integrated circuit IC1 changes from high level to low level, and the electric energy stored in the capacitor C2 is discharged through the resistor R2. Due to the reverse characteristic of the diode D8, the electric energy stored in the capacitor C1 cannot be discharged through the resistor R2, and the original U2 voltage value, according to the characteristics of integrated circuit 7555, when the capacitor C2 voltage drops to When U2 is on, the output signal Uo1 at pin 3 of the integrated circuit IC1 changes from low level to high level, and Uo1 charges the capacitor C2 through the resistor R2 again. Since the capacitor C1 maintains its original U2 voltage value, Uo1 does not charge capacitor C1, when capacitor C2 voltage rises to When U2 is on, Uo1 flips again, repeating the discharge process of capacitor C2, so that the 3rd pin of integrated circuit IC1 outputs a pulse control signal Uo1 with a fixed frequency, controlling the MOS tube VT1 of the switch circuit to be periodically turned on and off, so that the coil works in the state of periodic pulse voltage application, and the shunt release works in the state of maintaining the pull-in state;
[0027] After the power supply voltage Ui is de-energized, the control circuit returns to the de-energized state, and the voltage U2 drops to 0. At this time, the electricity stored in the capacitor C1 is released to the entire circuit through the diode D5. At the same time, the coil loses power to release the shunt release. When the power supply voltage Ui is energized again, the above process is repeated.
[0028] According to the working principle of the above circuit, after the control circuit is powered, the voltage of capacitor C2 is calculated by setting the parameters of resistor R2 and capacitor C2. U2 and discharge to The time between U2 can accurately control the working current frequency of the coil. By setting the parameters of capacitor C1 and resistor R2, the voltage of capacitor C1 is calculated to be charged to The timing of U2 can accurately control the full voltage application time t1 of the coil, thereby achieving reliable starting and maintenance of the shunt release.
Claims
1. A holding type shunt release, comprising a single-coil electromagnet, a switch circuit for controlling the on and off of the single-coil electromagnet, and a control circuit for controlling the switch circuit; characterized in that: The control circuit comprises: A rectifier circuit, used for converting the grid voltage into a DC voltage and serving as a working power supply voltage for the single-coil electromagnet; a power supply circuit for stepping down the DC voltage into a low-voltage DC voltage; an oscillator circuit, which uses the low-voltage DC voltage as a working power supply and is used to generate a pulse control signal for the switch circuit; The timing circuit uses the low-voltage DC voltage as a working power supply and is used to drive the oscillation circuit to first output a high-level single pulse control signal with a larger pulse width, and then continuously output a periodic pulse control signal with a smaller pulse width after the low-voltage DC power is established.
2. The holding type shunt release as claimed in claim 1, characterized in that: The timing circuit includes a diode D6, a diode D8 and a capacitor C1, one end of the capacitor C1 is connected to the anode of the diode D6 and the cathode of the diode D8, the other end of the capacitor C1 is grounded, and the cathode of the diode D6 is connected to the low-voltage DC voltage; the oscillation circuit includes a resistor R2, a capacitor C2, and an integrated circuit IC1, and the integrated circuit IC1 is a time base circuit 7555; the cathode of the diode D6 is connected to pins 4 and 8 of the integrated circuit IC1, one end of the resistor R2, one end of the capacitor C2, and the anode of the diode D8 are connected to pins 2 and 6 of the integrated circuit IC1, the other end of the resistor R2 is connected to pin 3 of the integrated circuit IC1, the other end of the capacitor C2 and pin 1 of the integrated circuit IC1 are connected to ground, and pin 3 of the integrated circuit IC1 is used to output a pulse control signal; The capacity of capacitor C1 is much larger than the capacity of capacitor C2.
3. The holding type shunt release as claimed in claim 1, characterized in that: The switching circuit includes an electronic switch and a diode, the diode is connected in parallel with the coil of the single-coil electromagnet, the cathode of the diode is connected to the DC voltage, the anode of the diode is connected to the input end of the electronic switch, the control end of the electronic switch is connected to the pulse control signal output by the oscillation circuit, and the output end of the electronic switch is grounded.