High voltage power supply short circuit output protection circuitry

Abstract

The utility model discloses a kind of high-voltage power supply short-circuit output protection circuit systems, comprising: cascaded switch module unit, the input end of cascaded switch module unit is connected with power device unit, the output end of cascaded switch module unit is connected with one end of current sampling impedance unit, the other end of current sampling impedance unit is connected with one end of current-limiting impedance module unit, the other end of current-limiting impedance module unit is grounded through load impedance unit;Two ends of current sampling impedance unit are connected with the input end of isolation transformer unit in parallel, one end of the output end of isolation transformer unit is grounded, and the other end is connected with the control end of cascaded switch module unit through voltage follower unit and sampling resistance unit.The utility model discloses a kind of high-voltage power supply short-circuit output protection circuit systems improves the stability and security of power supply, saves time cost and equipment cost, reduces test threshold.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor testing technology, specifically to a high-voltage power supply short-circuit output protection circuit system. Background Technology

[0002] High-voltage power supplies operate in a high-voltage environment. If a short circuit occurs at the output of a high-voltage power supply, it can easily lead to circuit failure due to instantaneous overcurrent. Currently, there is a lack of accurate and safe high-voltage power supply equipment.

[0003] Therefore, there is an urgent need to develop a high-voltage power supply short-circuit output protection circuit system that can significantly improve the stability of high-voltage power supply equipment. Utility Model Content

[0004] This invention overcomes the shortcomings of the prior art and provides a high-voltage power supply short-circuit output protection circuit system, which improves the stability and safety of the power supply, saves time and equipment costs, and lowers the testing threshold.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a high-voltage power supply short-circuit output protection circuit system, comprising: a cascaded switch module unit, wherein the input terminal of the cascaded switch module unit is connected to a power supply unit, the output terminal of the cascaded switch module unit is connected to one end of a current sampling impedance unit, the other end of the current sampling impedance unit is connected to one end of a current limiting impedance module unit, and the other end of the current limiting impedance module unit is grounded through a load impedance unit; The two ends of the current sampling impedance unit are connected in parallel with the input end of the isolation transformer unit. One end of the output end of the isolation transformer unit is grounded, and the other end is connected to the control end of the cascaded switch module unit through the voltage follower unit and the sampling resistor unit.

[0006] In a preferred embodiment of this utility model, the isolation transformer unit includes an isolation transformer, a high-voltage attenuator 1, and a high-voltage attenuator 2. The input terminals of high-voltage attenuator 1 and high-voltage attenuator 2 are respectively connected to the two ends of the current sampling impedance unit. The output terminals of high-voltage attenuator 1 and high-voltage attenuator 2 are respectively connected to one side of the isolation transformer. The other side of the isolation transformer is grounded as one side of the output terminal. The other side of the output terminal is connected to the positive input terminal of the voltage follower unit through the input impedance. The inverted input terminal of the voltage follower unit is connected to the output terminal of the voltage follower unit.

[0007] In a preferred embodiment of this utility model, the sampling resistor unit and the control terminal of the cascaded switch module unit are connected through a current amplifier unit. The inverting input terminal of the current amplifier unit is connected to the output terminal of the voltage follower unit through the sampling resistor unit. The non-inverting input terminal of the current amplifier unit is grounded. The output terminal of the current amplifier unit is connected to the control terminal of the cascaded switch module unit, and the inverting input terminal of the current amplifier unit is connected to the output terminal of the current amplifier unit through a transconductance resistor unit.

[0008] In a preferred embodiment of this invention, the two ends of the impulse absorption varistor are connected to the grounding terminal of the load impedance unit.

[0009] In a preferred embodiment of this utility model, the power supply unit includes a power supply module, the positive terminal of which is connected to the input terminal of the cascaded switch module unit, and the negative terminal of which is grounded.

[0010] In a preferred embodiment of this utility model, the cascaded switch module unit includes several groups of cascaded switches arranged in parallel. Each group of cascaded switches includes a semiconductor switch and a control optocoupler connected to the control terminal of the semiconductor switch. The adjacent semiconductor switches are connected through the source and drain of the semiconductor switches as input and output terminals. The source and drain of the outer side of the cascaded switch module unit are respectively connected to the output terminal of the power supply unit and the input terminal of the current sampling impedance unit.

[0011] In a preferred embodiment of this invention, the semiconductor switches of the cascaded switch group are field-effect transistors; the control optocoupler is an optocoupler; and the cascaded switch group also includes an LED control thyristor device. The control terminal of the field-effect transistor is connected to the signal acquisition terminal of the optocoupler. The forward terminal of the light-emitting diode of the optocoupler is connected to the power supply VLED, the reverse terminal of the light-emitting diode is connected to the input terminal of the LED-controlled thyristor, the output terminal of the LED-controlled thyristor is grounded, and the control terminal of the LED-controlled thyristor is connected to the output terminal of the current amplifier unit.

[0012] In a preferred embodiment of this invention, the current-limiting impedance module unit includes several groups of current-limiting resistors connected in parallel.

[0013] This utility model solves the defects existing in the technical background, and the beneficial technical effects of this utility model are: This utility model discloses a high-voltage power supply short-circuit output protection circuit system, which improves the stability and safety of the power supply, saves time and equipment costs, and lowers the testing threshold. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is an overall framework diagram of a high-voltage power supply short-circuit output protection circuit system according to a preferred embodiment of this utility model; Figure 2 This is a circuit diagram of a cascaded semiconductor switch module in a high-voltage power supply short-circuit output protection circuit system according to a preferred embodiment of this utility model. Figure 3 This is a preferred embodiment of the present invention, showing the transient response waveform of a high-voltage power supply short-circuit output protection circuit system after a momentary short circuit of the 1KV output voltage, as the voltage enters a low-voltage protection state. Figure 1 (The response waveform of the output current during a momentary short circuit when the high-voltage power supply outputs 1KV, which is immediately controlled by the protection circuit to enter the protection state). Figure 4 This is a preferred embodiment of the present invention, showing the transient response waveform of a high-voltage power supply short-circuit output protection circuit system after a momentary short circuit of the 1KV output voltage, as the voltage enters a low-voltage protection state. Figure 2 (V(vout+,vout-) represents the output voltage response waveform when the high-voltage power supply outputs 1KV during an instantaneous short circuit). Among them, X1 is the power supply unit; X2 is the cascaded switch module unit; X3 is the current sampling impedance unit; X4 is the current limiting impedance module unit; X5 is the load impedance unit; X6 is the impulse absorption varistor unit; X7 is the isolation transformer unit; X8 is the voltage follower unit; X8-1 is the input impedance; X9 is the sampling resistor unit; X10 is the transconductance resistor unit; and X11 is the current amplifier unit. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0017] It should be noted that if directional indicators (such as up, down, bottom, top, etc.) are involved in the embodiments of this utility model, the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0018] Example 1, as Figure 1 As shown, a high-voltage power supply short-circuit output protection circuit system includes: a cascaded switch module unit X2, the input terminal of which is connected to a power supply unit X1. The power supply unit X1 includes a power module, the positive terminal of which is connected to the input terminal of the cascaded switch module unit X2, and the negative terminal of which is grounded. The output terminal of the cascaded switch module unit X2 is connected to one end of a current sampling impedance unit X3, the other end of which is connected to one end of a current limiting impedance module unit X4, and the other end of the current limiting impedance module unit X4 is grounded through a load impedance unit X5.

[0019] Furthermore, the two ends of the current sampling impedance unit X3 are connected in parallel with the input terminal of the isolation transformer unit X7. One end of the output terminal of the isolation transformer unit X7 is grounded, and the other end is connected to the control terminal of the cascaded switch module unit X2 through the voltage follower unit X8 and the sampling resistor unit X9. Specifically, the isolation transformer unit X7 includes an isolation transformer, a high-voltage attenuator I, and a high-voltage attenuator II. The input terminals of high-voltage attenuator I and high-voltage attenuator II are respectively connected to the two ends of the current sampling impedance unit X3. The output terminals of high-voltage attenuator I and high-voltage attenuator II are respectively connected to one side of the isolation transformer. The other side of the isolation transformer is grounded as one side of the output terminal. The other side of the output terminal is connected to the positive input terminal of the voltage follower unit X8 through the input impedance X8-1. The inverting input terminal of the voltage follower unit X8 is connected to the output terminal of the voltage follower unit X8.

[0020] Furthermore, the sampling resistor unit X9 is connected to the control terminal of the cascaded switch module unit X2 through the current amplifier unit 11. The inverting input terminal of the current amplifier unit 11 is connected to the output terminal of the voltage follower unit X8 through the sampling resistor unit X9. The non-inverting input terminal of the current amplifier unit 11 is grounded. The output terminal of the current amplifier unit 11 is connected to the control terminal of the cascaded switch module unit X2. The inverting input terminal of the current amplifier unit 11 is connected to the output terminal of the current amplifier unit 11 through the transconductance resistor unit X10.

[0021] Furthermore, the two ends of the impulse absorption varistor unit X6 are connected to the ground terminal of the load impedance unit X5.

[0022] Specifically, the current-limiting impedance module unit X4 includes several sets of current-limiting resistors connected in parallel.

[0023] In Example 2, based on Example 1, a cascaded switch module unit X2 of a high-voltage power supply short-circuit output protection circuit system includes several groups of cascaded switches arranged in parallel. Each group of cascaded switches includes a semiconductor switch and a control optocoupler connected to the control terminal of the semiconductor switch. Adjacent semiconductor switches are connected through the source and drain of the semiconductor switch as input and output terminals. The source and drain of the outer side of the cascaded switch module unit X2 are respectively connected to the output terminal of the power supply unit X1 and the input terminal of the current sampling impedance unit X3.

[0024] Specifically, in this embodiment, the semiconductor switches of the cascaded switch group are field-effect transistors; the control optocoupler is an optocoupler, and the cascaded switch group also includes an LED-controlled thyristor device; the control terminal of the field-effect transistor is connected to the signal acquisition terminal of the optocoupler, the forward terminal of the light-emitting diode of the optocoupler is connected to the power supply VLED, the reverse terminal of the light-emitting diode is connected to the input terminal of the LED-controlled thyristor device, the output terminal of the LED-controlled thyristor device is grounded, and the control terminal of the LED-controlled thyristor device is connected to the output terminal of the current amplifier unit X11.

[0025] Example 3: Based on Example 1 or Example 2, in this example, as... Figure 1 As shown, power supply unit X1 serves as a high-voltage power supply. The output current of power supply unit X1 flows sequentially through current sampling impedance unit X3, current limiting impedance module unit X4 (X4 is composed of multiple non-inductive high-voltage glass enamel resistors connected in parallel), and load impedance unit X5. During circuit operation, the current sampling impedance unit X3, current limiting impedance module unit X4, and load impedance unit X5 work in a restraining manner through series connection.

[0026] More specifically, such as Figure 1As shown, the high-voltage input side of the current sampling impedance unit X3 is connected to the module output terminal of the cascaded semiconductor switch module unit X2, and the low-voltage side of the current sampling impedance unit X3 is connected to the high-voltage side of the current-limiting impedance module unit X4. The low-voltage side of the current-limiting impedance module unit X4 is connected to the high-voltage side of the load impedance unit X5, and the low-voltage side of the load impedance unit X5 is connected to the system ground terminal GND. Further, as... Figure 2 As shown, the cascaded semiconductor switch module unit X2 serves as a high-voltage solid-state cascaded semiconductor switch module circuit. In this embodiment, the implementation of the cascaded semiconductor switch module unit X2 includes: the high-voltage solid-state cascaded semiconductor switch module unit X2 mainly comprises N-stage high-voltage MOSFET semiconductor switches X2-M1,...,X2-Mn. It also includes N sets of MOSFET-controlled optocouplers X2-OPTO1,...,X2-OPTOn; and N sets of optocoupler input LED-controlled thyristor devices X2-TRIAC1,...,X2-TRIACn. Further, X2-TRIAC uses an 800V thyristor MAC210_10; X2-M1 uses a 1KV high-voltage MOSFET IRFAG30; and X2-OPTO1 uses a 16KV isolation voltage-rated optocoupler OPI1266. More specifically, as... Figure 2 As shown, the N-stage high-voltage MOSFET semiconductor switches X2-M1,...,X2-Mn in the high-voltage solid-state cascaded semiconductor switch module circuit are connected in series from the module input to the module output. These serially connected MOSFET semiconductor switches directly control the voltage and current output of the high-voltage device. The switch outputs VO of the N groups of optocouplers X2-OPTO1,...,X2-OPTOn are connected sequentially to the control terminals of each MOSFET. The VCC power supply pins of the optocouplers are connected sequentially to the power supplies VC1,...,VCn. The VEE power supply pins of the optocouplers are connected sequentially to the GND pin. The anodes of the LEDs on the input side of the N-stage optocouplers X2-OPTO1,...,X2-OPTOn are all connected to the power supply VLED, and the anodes of the LEDs on the K-pins of the optocouplers are connected sequentially to the output terminals of the SCRs X2-TRIAC1,...,X2-TRIACn. The control terminals on the input side of the SCRs X2-TRIAC,...,X2-TRIACn are connected in series with wires.

[0027] like Figure 1As shown, the low-voltage loop control section of a high-voltage power supply short-circuit output protection circuit system includes: an isolation transformer in isolation transformer unit X7 serving as a high-voltage isolation transformer. The primary end of the isolation transformer in isolation transformer unit X7 is connected in parallel to both ends of current sampling impedance unit X3 through high-voltage attenuator one and high-voltage attenuator two. High-voltage attenuator one and high-voltage attenuator two in high-voltage isolation transformer unit X7 respectively adopt the upper arm X7-1 and the lower arm X7-2 of the primary side high-voltage attenuator. The upper arm X7-1 of the primary side high-voltage attenuator is connected to the high side of current sampling impedance unit X3, and the lower arm X7-2 of the primary side high-voltage attenuator is connected to the low side of current sampling impedance unit X3. In the circuit structure, isolation transformer unit X7 and current sampling impedance unit X3 are connected in parallel. The upper arm of the secondary side of isolation transformer unit X7 is connected to the non-inverting input terminal of voltage follower unit X8, and the lower arm of the secondary side of isolation transformer unit X7 is connected to GND.

[0028] Specifically, one side of the secondary output terminal of the isolation transformer is connected to the low-voltage ground plane, and the other side is connected to the positive input terminal of the voltage follower unit X8. The isolation transformer, through its high-voltage isolation and voltage acquisition functions, combined with the current sampling impedance unit X3, completes the sampling of the current on the high-voltage transmission line. The output of the voltage follower unit X8 is connected in series with the sampling resistor unit X9, which serves as a low-voltage sampling resistor unit. The transconductance resistor unit X10, connected between the inverting input and output terminals of the current amplifier unit X11, serves as a low-voltage transconductance resistor unit to sample the current flowing through the sampling resistor unit X9.

[0029] More specifically, such as Figure 1 As shown, the varistor unit X6 serves as a transient high-voltage surge absorption varistor unit. One end of the varistor unit X6 is connected to the ground terminal of the load impedance unit X5, and the other end of the varistor unit X6 is connected in parallel to the system's ground terminal GND. This parallel connection absorbs the voltage overshoot from the instantaneous high-voltage surge.

[0030] More specifically, such as Figure 1 The voltage follower unit X8 shown mainly consists of operational amplifiers. The output of voltage follower unit X8 is connected in series with low-voltage sampling resistor unit X9. Sampling resistor unit X9 is connected to the inverting input of current amplifier unit X11. The inverting input and output of current amplifier unit X11 are connected in parallel with low-voltage transconductance resistor X10. The output of current amplifier unit X11 is connected to the control terminal of high-voltage solid-state cascaded semiconductor switching module unit X2 to complete the closed-loop control function of the circuit protection system.

[0031] Working principle: This invention relates to a high-voltage power supply short-circuit output protection circuit system. It overcomes the problem of ineffective protection against instantaneous short circuits in power supply outputs, particularly in high-voltage special power supplies. This invention significantly improves the stability and safety of the power supply, providing a safer and more stable testing device for high-voltage environments, and promoting progress in the domestic high-voltage special power supply and high-voltage semiconductor chip testing fields.

[0032] The current output by the power supply unit X1 of this utility model's high-voltage power supply short-circuit output protection circuit system is converted into voltage by the current sampling impedance unit X3. The voltage of the current sampling impedance unit X3 is sampled by the attenuation circuit of the isolation transformer in the isolation transformer unit X7, which acts as a floating high-voltage isolation transformer. The sampled voltage of the current sampling impedance unit X3 is then transmitted to the input terminal of the low-voltage operational amplifier loop circuit via the isolation transformer unit X7. The low-voltage operational amplifier loop circuit includes a voltage follower unit X8, a sampling resistor unit X9, a transconductance resistor unit X11, and a current amplifier unit X11. The circuit achieves voltage following through the voltage follower unit X8, performs voltage-to-current sampling through the low-voltage sampling resistor unit X9, and uses the low-voltage transconductance resistor unit X10 as feedback for the current amplifier X11 to convert current into voltage. The current amplifier X11 outputs to the control side of the cascaded semiconductor switching module unit 2, thus completing the output control of the high-voltage output power supply by the low-voltage operational amplifier loop circuit.

[0033] The above specific embodiments are specific support for the proposed solution concept of this utility model, and should not be used to limit the protection scope of this utility model. Any equivalent changes or modifications made on the basis of this technical solution in accordance with the technical concept proposed by this utility model shall still fall within the protection scope of this utility model.

Claims

1. A high-voltage power supply short-circuit output protection circuit system, characterized in that, include: A cascaded switch module unit (X2) is provided, with its input terminal connected to a power supply unit (X1), its output terminal connected to one end of a current sampling impedance unit (X3), the other end of which is connected to one end of a current limiting impedance module unit (X4), and the other end of which is grounded through a load impedance unit (X5). The two ends of the current sampling impedance unit (X3) are connected in parallel with the input end of the isolation transformer unit (X7). One end of the output end of the isolation transformer unit (X7) is grounded, and the other end is connected to the control end of the cascaded switch module unit (X2) through the voltage follower unit (X8) and the sampling resistor unit (X9).

2. The high-voltage power supply short-circuit output protection circuit system according to claim 1, characterized in that: The isolation transformer unit (X7) includes an isolation transformer, a high-voltage attenuator 1, and a high-voltage attenuator 2. The input terminals of the high-voltage attenuator 1 and the high-voltage attenuator 2 are respectively connected to the two ends of the current sampling impedance unit (X3). The output terminals of the high-voltage attenuator 1 and the high-voltage attenuator 2 are respectively connected to one side of the isolation transformer. The other side of the isolation transformer is grounded as one side of the output terminal. The other side of the output terminal is connected to the positive input terminal of the voltage follower unit (X8) through the input impedance (X8-1). The inverting input terminal of the voltage follower unit (X8) is connected to the output terminal of the voltage follower unit (X8).

3. The high-voltage power supply short-circuit output protection circuit system according to claim 2, characterized in that: The sampling resistor unit (X9) is connected to the control terminal of the cascaded switch module unit (X2) through the current amplifier unit (11). The inverting input terminal of the current amplifier unit (11) is connected to the output terminal of the voltage follower unit (X8) through the sampling resistor unit (X9). The non-inverting input terminal of the current amplifier unit (11) is grounded. The output terminal of the current amplifier unit (11) is connected to the control terminal of the cascaded switch module unit (X2). The inverting input terminal of the current amplifier unit (11) is connected to the output terminal of the current amplifier unit (11) through the transconductance resistor unit (X10).

4. The high-voltage power supply short-circuit output protection circuit system according to claim 3, characterized in that: The two ends of the impulse absorption varistor unit (X6) are connected to the ground terminal of the load impedance unit (X5).

5. The high-voltage power supply short-circuit output protection circuit system according to claim 4, characterized in that: The power supply unit (X1) includes a power module, the positive terminal of which is connected to the input terminal of the cascaded switch module unit (X2), and the negative terminal of which is grounded.

6. The high-voltage power supply short-circuit output protection circuit system according to claim 5, characterized in that: The cascaded switch module unit (X2) includes several groups of cascaded switches arranged in parallel. Each group of cascaded switches includes a semiconductor switch and a control optocoupler connected to the control terminal of the semiconductor switch. The adjacent semiconductor switches are connected as input and output terminals through the source and drain of the semiconductor switches. The source and drain of the cascaded switch module unit (X2) are connected to the output terminal of the power supply unit (X1) and the input terminal of the current sampling impedance unit (X3), respectively.

7. The high-voltage power supply short-circuit output protection circuit system according to claim 6, characterized in that: The semiconductor switches in the cascaded switch group are field-effect transistors; the control optocoupler is an optocoupler, and the cascaded switch group also includes LED control thyristor devices. The control terminal of the field-effect transistor is connected to the signal acquisition terminal of the optocoupler. The forward terminal of the light-emitting diode of the optocoupler is connected to the power supply VLED. The reverse terminal of the light-emitting diode is connected to the input terminal of the LED control thyristor device. The output terminal of the LED control thyristor device is grounded. The control terminal of the LED control thyristor device is connected to the output terminal of the current amplifier unit (11).

8. The high-voltage power supply short-circuit output protection circuit system according to claim 7, characterized in that: The current-limiting impedance module unit (X4) includes several sets of current-limiting resistors connected in parallel.

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