High-voltage charge active consumption type constant-current discharge device

Abstract

The utility model relates to a high-voltage charge active consumption type constant-current discharge device, which is characterized in that the positive pole of the input control end of a normally-open solid-state relay is connected with the positive pole of a low-voltage power supply end, the negative pole of the input control end of the normally-open solid-state relay is connected with the first end of a first resistor, and the second end of the first resistor is connected with the negative pole of the low-voltage power supply end; the anode of the high-voltage electrolytic capacitor is connected with the first end of the output end of the normally-open solid-state relay; the cathode of the high-voltage electrolytic capacitor is connected with the cathode of the low-voltage power supply end; the first end of the second resistor is connected with the second end of the output end of the normally-open solid-state relay. The second end of the second resistor is connected with the cathode of the light-emitting diode. The base of the triode is connected with the second end of the second resistor, the collector of the triode is connected with the first end of the second resistor, the emitter of the triode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the negative electrode of the low-voltage power supply end. The normally-open solid-state relay serves as a switch, and a constant-current circuit of the NPN-type triode and the light-emitting diode is used for discharging charges.

Description

Technical Field

[0001] The utility model relates to a high-voltage charge active consumption type constant current discharge device. Background Art

[0002] In the field of precision positioning technology, the power supply voltage of the piezoelectric drive circuit is as high as hundreds of volts. In order to obtain a stable output voltage, a large-capacity electrolytic capacitor is usually matched at the output end of the piezoelectric drive circuit power supply. After the piezoelectric driver is powered off, the charge in the output capacitor of the power supply cannot be released quickly. If a person or device touches the positive and negative poles of the power module output at this time, it will cause electric shock to the human body or damage to the equipment. Therefore, the discharge of high-voltage charge is an important function related to personal safety and equipment safety. Therefore, it is necessary to use technical means to quickly discharge the capacitor voltage to a safe voltage after the piezoelectric driver is powered off to ensure that the power supply is harmless to the human body and other equipment.

[0003] In addition, for the power supply of the piezoelectric drive circuit, since the output voltage is as high as hundreds of volts, it is required that the discharge circuit cannot work when the power supply is working normally, otherwise it will cause serious heat and energy waste. Therefore, it is necessary that the discharge circuit does not work when the high-voltage power supply is working; after the high-voltage power supply is powered off, the discharge circuit actively discharges the high-voltage charge.

[0004] At present, the traditional discharge circuit is either a passive consumption discharge circuit based on a passive resistor element for charge discharge, or an active consumption discharge circuit that starts to discharge the charge after the power supply is turned off. For the scheme based on passive resistor elements for charge discharge, there are the following disadvantages: ① When the power supply is working normally, current will also flow through the discharge resistor, especially when the voltage difference across the capacitor is as high as hundreds of volts. If the discharge resistor has a relatively small resistance, the power consumed by the discharge resistor will be very large, which will not only lead to low power efficiency, but also cause the discharge resistor to be huge. If the resistance of the discharge resistor is too large, the charge discharge effect will be very limited. ② During the discharge process, as the voltage across the capacitor decreases, the current flowing through the discharge resistor becomes smaller and smaller, causing the discharge process to become slower and slower.

[0005] For active consumption charge discharge solutions, a switch is required to control the discharge of charge. In existing active charge discharge circuits, switches are all based on transistor-based logic circuits. When the charge does not need to be discharged, the logic circuit also needs to absorb current from both ends of the capacitor to maintain the closed state. Even if the static current is very low, it will cause very large power loss for the output voltage of hundreds of volts of the piezoelectric drive circuit power supply. In addition, due to the high voltage, the selection of devices is very difficult.

[0006] In order to solve the above problems, it is necessary to provide a high-voltage charge active consumption constant current discharge circuit with simple structure and low cost. Utility Model Content

[0007] The utility model aims to overcome the deficiencies in the prior art and provide a high-voltage charge active consumption type constant current discharge device.

[0008] The purpose of the utility model is achieved through the following technical solutions:

[0009] The invention discloses a high-voltage charge active consumption type constant current discharge device, which is characterized by comprising a normally open switch module and a constant current discharge circuit, wherein the normally open switch module comprises a normally open solid-state relay and a first resistor, and the constant current discharge circuit comprises a second resistor, a third resistor, a transistor and a light-emitting diode, wherein the positive electrode of the input control end of the normally open solid-state relay is connected to the positive electrode of the low-voltage power supply end, the negative electrode of the input control end of the normally open solid-state relay is connected to the first end of the first resistor, and the second end of the first resistor is connected to the negative electrode of the low-voltage power supply end; the positive electrode of the high-voltage electrolytic capacitor is connected to the first end of the output end of the normally open solid-state relay, and the negative electrode of the high-voltage electrolytic capacitor is connected to the negative electrode of the low-voltage power supply end; the first end of the second resistor is connected to the second end of the output end of the normally open solid-state relay, and the second end of the second resistor is connected to the negative electrode of the light-emitting diode; the base of the transistor is connected to the second end of the second resistor, the collector of the transistor is connected to the first end of the second resistor, the emitter of the transistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the negative electrode of the low-voltage power supply end.

[0010] Furthermore, in the above-mentioned high-voltage charge active consumption type constant current discharge device, the transistor is an NPN transistor.

[0011] Furthermore, in the above-mentioned high-voltage charge active consumption type constant current discharge device, the capacitance of the high-voltage electrolytic capacitor is more than several hundred uF.

[0012] Furthermore, in the above-mentioned high-voltage charge active consumption type constant current discharge device, the resistance value of the first resistor is above kiloohms.

[0013] Furthermore, in the above-mentioned high-voltage charge active consumption type constant current discharge device, the resistance of the second resistor is above kilo-ohms.

[0014] Furthermore, in the above-mentioned high-voltage charge active consumption type constant current discharge device, the resistance value of the third resistor is 1 ohm to 100 ohms.

[0015] Compared with the prior art, the present invention has significant advantages and beneficial effects, which are specifically embodied in the following aspects:

[0016] ① Using a normally open solid-state relay as the switch of the high-voltage charge active consumption discharge circuit, using a constant current circuit based on an NPN transistor and a light-emitting diode to discharge the charge, and the light-emitting diode to display the charge discharge result; the circuit structure is simple and the performance is reliable;

[0017] ②The normally open solid-state relay has a higher withstand voltage. As a switch of the discharge circuit, the normally open solid-state relay is inexpensive, low cost and has stable performance;

[0018] ③ The constant current circuit based on NPN transistor and light-emitting diode is used for charge discharge, which greatly shortens the charge discharge time; the indicator light shows the charge discharge result to improve safety.

[0019] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the specific implementation of the utility model. The purpose and other advantages of the utility model can be achieved and obtained by the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 : Schematic diagram of the circuit principle of the utility model;

[0022] Figure 2 : Schematic diagram of the circuit structure of the utility model. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the utility model.

[0024] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the utility model, directional terms and order terms are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] like Figure 1 , Figure 2 As shown, a high-voltage charge active consumption type constant current discharge device comprises a normally open switch module 101 and a constant current discharge circuit 102, which is arranged between a low-voltage control terminal L and a high-voltage charge terminal H. The normally open switch module 101 comprises a normally open solid-state relay U1 and a first resistor R1, and the constant current discharge circuit 102 comprises a second resistor R2, a third resistor R3, a transistor Q1 and a light-emitting diode LED1. The positive electrode of the input control terminal of the normally open solid-state relay U1 is connected to the positive electrode of the low-voltage power supply terminal P1, the negative electrode of the input control terminal of the normally open solid-state relay U1 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the low-voltage power supply terminal P1. The cathode of the low-voltage power supply terminal P1 is connected to the cathode of the high-voltage electrolytic capacitor C1; the anode of the high-voltage electrolytic capacitor C1 is connected to the first end of the output terminal of the normally-open solid-state relay U1, and the cathode of the high-voltage electrolytic capacitor C1 is connected to the cathode of the low-voltage power supply terminal P1; the first end of the second resistor R2 is connected to the second end of the output terminal of the normally-open solid-state relay U1, and the second end of the second resistor R2 is connected to the cathode of the light-emitting diode LED1; the base of the transistor Q1 is connected to the second end of the second resistor R2, the collector of the transistor Q1 is connected to the first end of the second resistor R2, the emitter of the transistor Q1 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the cathode of the low-voltage power supply terminal P1.

[0026] The transistor Q1 is an NPN transistor. The capacitance of the high-voltage electrolytic capacitor C1 is hundreds of uF or more. The resistance of the first resistor R1 is several thousand ohms. The resistance of the second resistor R2 is several thousand ohms. The resistance of the third resistor R3 is 1 ohm to 100 ohms.

[0027] In specific applications, when the piezoelectric driver is powered on, the low-voltage power supply terminal P1 is powered on, the photodiode in the normally open solid-state relay U1 is lit, and the output terminal of the normally open solid-state relay U1 is disconnected; the constant current discharge circuit does not work, and at this time the entire discharge circuit will only absorb a weak current from the low-voltage terminal to maintain the current state;

[0028] When the piezoelectric driver is powered off, the low voltage control terminal P1 is powered off, the photodiode inside the normally open solid-state relay U1 is extinguished, the output terminal of the normally open solid-state relay U1 is closed, and the high voltage charge flows into the constant current discharge module. The light-emitting diode lights up, and its forward voltage drop is V F ; Due to the forward voltage drop of the diode V F The voltage between the base and emitter of NPN transistor Q1 is V BE , the NPN transistor Q1 is turned on, and the voltage drop across the third resistor R3 is:

[0029] V R3 =V F -V BE

[0030] According to the forward conduction characteristics of the PN junction, V F 、V BE Basically remain unchanged; therefore, the voltage across the third resistor R3 remains constant, and the current flowing through the third resistor R3 remains constant;

[0031] Therefore, when the output terminal of the normally open solid-state relay U1 is closed, the high-voltage charge is quickly discharged through the constant current discharge circuit; when the charge discharge is completed, the light-emitting diode LED1 is turned off to indicate that the charge discharge is complete.

[0032] In summary, the utility model uses a normally open solid-state relay as a switch of a high-voltage charge active consumption discharge circuit, uses a constant current circuit based on an NPN transistor and a light-emitting diode to discharge the charge, and displays the charge discharge result by a light-emitting diode. Its circuit structure is simple, the normally open solid-state relay has a high withstand voltage, and the normally open solid-state relay is used as a switch of the discharge circuit, which is low in price and reliable in performance. The constant current circuit based on the NPN transistor and the light-emitting diode is used to discharge the charge, which greatly shortens the charge discharge time, and the indicator light displays the charge discharge result, thereby improving safety.

[0033] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model. It should be noted that similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0034] The above is only a specific implementation of the present invention, but the protection scope of the present invention 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 present invention, which should be included in the protection scope of the present invention.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. High voltage charge active consumption constant current discharge device, characterized by: The invention comprises a normally open switch module (101) and a constant current discharge circuit (102), wherein the normally open switch module (101) comprises a normally open solid-state relay (U1) and a first resistor (R1), and the constant current discharge circuit (102) comprises a second resistor (R2), a third resistor (R3), a triode (Q1) and a light-emitting diode (LED1), wherein the positive electrode of the input control end of the normally open solid-state relay (U1) is connected to the positive electrode of the low-voltage power supply end (P1), the negative electrode of the input control end of the normally open solid-state relay (U1) is connected to the first end of the first resistor (R1), and the second end of the first resistor (R1) is connected to the negative electrode of the low-voltage power supply end (P1); and the high-voltage electrolytic capacitor ( The positive electrode of a first resistor (R2) is connected to the first end of the output end of a normally open solid-state relay (U1), and the negative electrode of a high-voltage electrolytic capacitor (C1) is connected to the negative electrode of a low-voltage power supply end (P1); the first end of a second resistor (R2) is connected to the second end of the output end of a normally open solid-state relay (U1), and the second end of the second resistor (R2) is connected to the negative electrode of a light-emitting diode (LED1); the base of a transistor (Q1) is connected to the second end of the second resistor (R2), the collector of the transistor (Q1) is connected to the first end of the second resistor (R2), the emitter of the transistor (Q1) is connected to the first end of a third resistor (R3), and the second end of the third resistor (R3) is connected to the negative electrode of the low-voltage power supply end (P1).

2. The high voltage charge active consumption type constant current discharge device according to claim 1 is characterized in that: The transistor (Q1) is an NPN transistor.

3. The high voltage charge active consumption constant current discharge device according to claim 1 is characterized in that: The capacitance of the high voltage electrolytic capacitor (C1) is above 100uF.

4. The high voltage charge active consumption type constant current discharge device according to claim 1 is characterized in that: The resistance of the first resistor (R1) is above kilohm.

5. The high voltage charge active consumption type constant current discharge device according to claim 1, characterized in that: The resistance of the second resistor (R2) is above kilohm.

6. The high voltage charge active consumption constant current discharge device according to claim 1, characterized in that: The resistance of the third resistor (R3) is 1 ohm to 100 ohms.

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