High-voltage current generator

Abstract

The utility model discloses a high-voltage current generator, which comprises a power supply, a starting resistor and a high-voltage current generating circuit, and the high-voltage current generating circuit is respectively connected with the starting resistor and the power supply. According to the utility model, only one starting resistor is used as a starting circuit, so that a circuit starting function is realized, and starting current is provided for the high-voltage current generating circuit; the high-voltage current generating circuit is used for working when starting current is accessed and outputting high-voltage current; compared with a traditional high-voltage starting circuit, the circuit of the starting resistor is simpler, the area of a circuit board is smaller, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage current generation, and particularly relates to a high-voltage current generator. Background Art

[0002] The high-voltage current generator can provide a high-voltage power supply and is widely used in power transmission. The traditional high-voltage current generator has two current operating points, namely the current zero point and the current operating point during normal operation. Therefore, a starting circuit is required in the high-voltage current generator to make it leave the initial state with zero current for normal operation. The current starting circuit consists of three high-voltage PMOS transistors and a resistor, but the circuit is relatively complex, resulting in a large circuit board area and higher costs. Content of the Utility Model

[0003] The purpose of the utility model is to design a high-voltage current generator to solve the above problems.

[0004] The utility model realizes the above purpose through the following technical solutions:

[0005] A high-voltage current generator, comprising:

[0006] A power supply, a starting resistor, and a high-voltage current generation circuit, wherein the high-voltage current generation circuit is respectively connected to the starting resistor and the power supply;

[0007] The starting resistor is used to provide a starting current for the high-voltage current generation circuit;

[0008] The high-voltage current generation circuit is used to operate when the starting current is connected and output a high-voltage current.

[0009] The beneficial effect of the utility model lies in:

[0010] The high-voltage current generator only uses one starting resistor to realize the function of the starting circuit, making it leave the initial state with zero current for normal operation; the traditional high-voltage starting circuit consists of three high-voltage PMOS transistors and a resistor. Therefore, compared with the traditional high-voltage starting circuit, the starting resistor in the utility model has a simpler circuit, a smaller circuit board area, and lower costs. Description of the Drawings

[0011] Figure 1 It is the overall block diagram of the high-voltage current generator of the utility model;

[0012] Figure 2 It is the circuit diagram of the high-voltage current generation circuit of the high-voltage current generator of the utility model;

[0013] Figure 3 It is the overall circuit diagram of the high-voltage current generator of the utility model;

[0014] In the figure: P1 - the first PMOS transistor, P2 - the second PMOS transistor, P3 - the third PMOS transistor, P4 - the fourth PMOS transistor, P5 - the fifth PMOS transistor, P6 - the sixth PMOS transistor, N1 - the first NMOS transistor, N2 - the second NMOS transistor, N3 - the third NMOS transistor, R1 - the first resistor, R2 - the second resistor, R3 - the startup resistor, Q1 - the first triode, Q2 - the second triode. Specific embodiments

[0015] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0017] It should be noted that: similar reference numerals and letters denote 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 subsequent drawings.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the product of the present invention is usually placed during use, or the orientation or positional relationships commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0019] In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, terms such as "arrangement" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] The following will describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings.

[0022] As Figures 1-3 shown, the high-voltage current generator includes:

[0023] a power supply, a starting resistor R3, and a high-voltage current generating circuit, and the high-voltage current generating circuit is respectively connected to the starting resistor R3 and the power supply;

[0024] The starting resistor R3 is used to provide a starting current for the high-voltage current generating circuit;

[0025] The high-voltage current generating circuit is used to work when the starting current is connected and output a high-voltage current.

[0026] In this embodiment, the high-voltage current generator only adopts one starting resistor R3 to realize the function of the starting circuit, enabling it to leave the initial state with zero current to work normally; however, the traditional high-voltage starting circuit needs to be composed of three high-voltage PMOS transistors and one resistor; therefore, compared with the traditional high-voltage starting circuit, the starting resistor R3 in this embodiment has a simpler circuit, a smaller circuit board area, and a lower cost.

[0027] In one embodiment, the high-voltage current generating circuit includes a first PMOS transistor P1, a second PMOS transistor P2, a third PMOS transistor P3, a first NMOS transistor N1, a second NMOS transistor N2, and a first resistor R1.

[0028] In this embodiment, the width-to-length ratios of the first PMOS transistor P1 and the second PMOS transistor P2 are the same, so the currents of the first PMOS transistor P1 and the second PMOS transistor P2 are equal. Since the currents of the first PMOS transistor P1 and the first NMOS transistor N1 are equal, and the currents of the second PMOS transistor P2 and the second NMOS transistor N2 are equal, the currents of the first NMOS transistor N1 and the second NMOS transistor N2 are also equal. The width-to-length ratio of the first NMOS transistor N1 is n times (n≥2) that of the second NMOS transistor N2. Then the current flowing through the first resistor R1 is equal to (VGS2 - VGS1) / R0 (VGS1 is the VGS voltage of the first NMOS transistor N1, and VGS2 is the VGS voltage of the second NMOS transistor N2). Since the current of the first resistor R1 is equal to the current of the first NMOS transistor N1, it is obtained that the currents of the first PMOS transistor P1, the second PMOS transistor P2, the second PMOS transistor P2, the second NMOS transistor N2, and the first resistor R1 are all equal to (VGS2 - VGS1) / R0. If the size of the third PMOS transistor P3 is equal to that of the first PMOS transistor P1, the output current Iout = (VGS2 - VGS1) / R0.

[0029] In another embodiment, the high-voltage current generation circuit includes a fourth PMOS transistor P4, a fifth PMOS transistor P5, a first triode Q1, a second triode Q2, and a second resistor R2. That is, only the first NMOS transistor N1 in the previous embodiment is replaced by the first triode Q1, and the second NMOS transistor N2 is replaced by the second triode Q2. Since there are many other implementation circuits for the high-voltage current generation circuit, it is not limited to the above high-voltage current generation circuit structure.

[0030] In one embodiment, the high-voltage current generator further includes:

[0031] A switch circuit, the switch circuit is connected to the high-voltage current generation circuit, and the switch circuit is used to control the high-voltage current generation circuit to start / stop working. Further, the switch circuit includes a third NMOS transistor N3 and a sixth PMOS transistor P6.

[0032] In this embodiment, the switching circuit can control the high-voltage current generating circuit to start / stop working. It can be understood that when the high-voltage current generating circuit is working, the gate voltage of the sixth transistor is equal to the power supply voltage, and the gate voltage of the third NMOS transistor N3 is 0V. Both the sixth PMOS transistor P6 and the third NMOS transistor N3 are in the non-conducting state, that is, the switching circuit is in the off state; when the high-voltage current generating circuit stops working, the gate voltage of the sixth PMOS transistor P6 is 0V, pulling up the gate voltage of the first PMOS transistor P1 to the power supply voltage, and the gate voltage of the third NMOS transistor N3 is equal to the power supply voltage, pulling down the gate voltage of the first NMOS transistor N1 to 0V. At this time, the current of the high-voltage current generating circuit is 0, that is, the output current Iout is 0.

[0033] In the high-voltage current generator of the present invention, only one starting resistor R3 is used to realize the function of the starting circuit; in the initial state, the currents of the first PMOS transistor P1, the second PMOS transistor P2, the third PMOS transistor P3, the first NMOS transistor N1, and the second NMOS transistor N2 are 0; when the starting resistor R3 is added, the voltage at point A is pulled down by the starting resistor R3, then the first PMOS transistor P1 starts to generate current, and the current is VA / R1, which makes the current leave the 0 degeneracy point and starts the high-voltage current starting circuit to start working; the resistance value of the starting resistor R3 is very large, and the current on the starting resistor R3 is much smaller than the current of the branch of the first NMOS transistor N1. Therefore, there is no need to turn off the current on the starting resistor R3. The starting resistor R3 can exist all the time as the starting circuit.

[0034] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A high voltage current generator, characterized in that: The high voltage current generator comprises: A power supply, a starting resistor and a high-voltage current generating circuit, wherein the high-voltage current generating circuit is connected to the starting resistor and the power supply respectively; The starting resistor is used to provide a starting current for the high-voltage current generating circuit; The high-voltage current generating circuit is used to work when the starting current is connected and output the high-voltage current.

2. The high voltage current generator according to claim 1, characterized in that: The high-voltage current generating circuit includes a first PMOS tube, a second PMOS tube, a third PMOS tube, a first NMOS tube, a second NMOS tube, and a first resistor.

3. The high voltage current generator according to claim 1, characterized in that: The high-voltage current generating circuit includes a fourth PMOS tube, a fifth PMOS tube, a first triode, a second triode, and a second resistor.

4. The high voltage current generator according to claim 1, characterized in that: The high voltage current generator also includes: A switch circuit is connected to the high-voltage current generating circuit, and the switch circuit is used to control the high-voltage current generating circuit to start / stop working.

5. The high voltage current generator according to claim 4, characterized in that: The switch circuit includes a third NMOS tube and a sixth PMOS tube.

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